ASP.NET 运行机制续（完结）
上一篇说到applicationInstance会执行一些列的事件。下面是我在msdn上找到有关asp.net程序生命周期相关的描述及图片
声明周期的起始
ASP.NET 应用程序的生命周期以浏览器向 Web 服务器（对于 ASP.NET 应用程序，通常为 IIS）发送请求为起点。 ASP.NET 是 Web 服务器下的 ISAPI 扩展。 Web 服务器接收到请求时，会对所请求的文件的文件扩展名进行检查，确定应由哪个 ISAPI 扩展处理该请求，然后将该请求传递给合适的 ISAPI 扩展。 ASP.NET 处理已映射到其上的文件扩展名，如 .aspx、.ascx、.ashx 和 .asmx。
ASP.NET 接收对应用程序的第一个请求
当 ASP.NET 接收到对应用程序中任何资源的第一个请求时，名为 ApplicationManager 的类会创建一个应用程序域。 应用程序域为全局变量提供应用程序隔离，并允许单独卸载每个应用程序。 在应用程序域中，将为名为 HostingEnvironment的类创建一个实例，该实例提供对有关应用程序的信息（如存储该应用程序的文件夹的名称）的访问。
为每个请求创建 ASP.NET 核心对象
创建了应用程序域并对 HostingEnvironment 对象进行了实例化之后，ASP.NET 将创建并初始化核心对象，如 HttpContext、HttpRequest 和 HttpResponse。 HttpContext 类包含特定于当前应用程序请求的对象，如 HttpRequest 和HttpResponse 对象。 HttpRequest 对象包含有关当前请求的信息，包括 Cookie 和浏览器信息。 HttpResponse 对象包含发送到客户端的响应，包括所有呈现的输出和 Cookie。
将 HttpApplication 对象分配给请求
初始化所有核心应用程序对象之后，将通过创建 HttpApplication 类的实例启动应用程序。 如果应用程序具有 Global.asax 文件，则 ASP.NET 会创建 Global.asax 类（从 HttpApplication 类派生）的一个实例，并使用该派生类表示应用程序。
注意
第一次在应用程序中请求 ASP.NET 页或进程时，将创建 HttpApplication 的一个新实例。不过，为了尽可能提高性能，可对多个请求重复使用 HttpApplication 实例。
创建 HttpApplication 的实例时，将同时创建所有已配置的模块。 例如，如果将应用程序这样配置，ASP.NET 就会创建一个 SessionStateModule 模块。 创建了所有已配置的模块之后，将调用HttpApplication 类的 Init 方法。
由 HttpApplication 管线处理请求。
在处理该请求时将由 HttpApplication 类执行以下事件。 希望扩展 HttpApplication 类的开发人员尤其需要注意这些事件。
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对请求进行验证，将检查浏览器发送的信息，并确定其是否包含潜在恶意标记。 有关更多信息，请参见 ValidateRequest 和脚本侵入概述。
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如果已在 Web.config 文件的 UrlMappingsSection 节中配置了任何 URL，则执行 URL 映射。
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引发 BeginRequest 事件；第一个事件
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引发 AuthenticateRequest 事件；验证请求，开始检查用户的身份，一把是获取请求的用户信息
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引发 PostAuthenticateRequest 事件；用户身份已经检查完毕，检查完成后可以通过HttpContext的User属性获取到，微软内置的身份验证机制，平时很少用到
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引发 AuthorizeRequest 事件；开始进行用户权限检查，如果用户没有通过上面的安全检查，一般会直接调至EndRequest事件，也就是直接跳至最后一个事件
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引发 PostAuthorizeRequest 事件；用户请求已经获取授权
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引发 ResolveRequestCache 事件；缓存，如果存在以前处理的缓存结果，则不再进行请求处理工作，返回缓存结果
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引发 PostResolveRequestCache 事件；缓存检查结束
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根据所请求资源的文件扩展名（在应用程序的配置文件中映射），选择实现 IHttpHandler 的类，对请求进行处理。 如果该请求针对从 Page 类派生的对象（页），并且需要对该页进行编译，则 ASP.NET 会在创建该页的实例之前对其进行编译；创建所请求的前台页面类
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引发 PostMapRequestHandler 事件；已经创建处理请求的处理器对象（IHttpHandler）
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引发 AcquireRequestState 事件；获取请求状态，一般用于获取session
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引发 PostAcquireRequestState 事件。已经获取到了session，如果获取到，则将session的值封装到httpcontext中的session属性中去，
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引发 PreRequestHandlerExecute 事件。以为上个事件已经封装了session信息，所以接下来就是验证身份信息的最好位置，如果不通过，直接处理，提高效率。这里也是准备执行处理程序，及调用HttpContext中Handler属性的ProcessRequest
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为该请求调用合适的 IHttpHandler 类的 ProcessRequest 方法（或异步版 IHttpAsyncHandler.BeginProcessRequest）。 例如，如果该请求针对某页，则当前的页实例将处理该请求。
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引发 PostRequestHandlerExecute 事件；页面的ProcessRequest方法执行完成
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引发 ReleaseRequestState 事件；准备释放请求状态session
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引发 PostReleaseRequestState 事件；已经释放请求状态
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如果定义了 Filter 属性，则执行响应筛选。
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引发 UpdateRequestCache 事件；更新缓存
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引发 PostUpdateRequestCache 事件；更新缓存完毕
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引发 EndRequest 事件；结束请求
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引发 PreSendRequestHeaders 事件；可通过发送的头信息设置参数，例如将类型设置为text/plain等
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引发 PreSendRequestContent 事件；处理数据，如配置压缩，则可在这里对数据进行压缩发送
好了，不贴人家的东西了，感兴趣的可以到原网站去看一下。我们重点就是看一下HttpApplication管线处理请求。下面是对事件的解释
| 名称 | 说明 | |
|---|---|---|
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AcquireRequestState | 当 ASP.NET 获取与当前请求关联的当前状态（如会话状态）时发生。 |
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AuthenticateRequest | 当安全模块已建立用户标识时发生。 |
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AuthorizeRequest | 当安全模块已验证用户授权时发生。 |
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BeginRequest | 在 ASP.NET 响应请求时作为 HTTP 执行管线链中的第一个事件发生。 |
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Disposed | 在释放应用程序时发生。 |
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EndRequest | 在 ASP.NET 响应请求时作为 HTTP 执行管线链中的最后一个事件发生。 |
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Error | 当引发未经处理的异常时发生。 |
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LogRequest | 恰好在 ASP.NET 为当前请求执行任何记录之前发生。 |
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MapRequestHandler | 基础结构。在选择了用来响应请求的处理程序时发生。 |
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PostAcquireRequestState | 在已获得与当前请求关联的请求状态（例如会话状态）时发生。 |
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PostAuthenticateRequest | 当安全模块已建立用户标识时发生。 |
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PostAuthorizeRequest | 在当前请求的用户已获授权时发生。 |
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PostLogRequest | 在 ASP.NET 处理完 LogRequest 事件的所有事件处理程序后发生。 |
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PostMapRequestHandler | 在 ASP.NET 已将当前请求映射到相应的事件处理程序时发生。 |
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PostReleaseRequestState | 在 ASP.NET 已完成所有请求事件处理程序的执行并且请求状态数据已存储时发生。 |
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PostRequestHandlerExecute | 在 ASP.NET 事件处理程序（例如，某页或某个 XML Web service）执行完毕时发生。 |
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PostResolveRequestCache | 在 ASP.NET 跳过当前事件处理程序的执行并允许缓存模块满足来自缓存的请求时发生。 |
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PostUpdateRequestCache | 在 ASP.NET 完成缓存模块的更新并存储了用于从缓存中为后续请求提供服务的响应后，发生此事件。 |
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PreRequestHandlerExecute | 恰好在 ASP.NET 开始执行事件处理程序（例如，某页或某个 XML Web services）前发生。 |
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PreSendRequestContent | 恰好在 ASP.NET 向客户端发送内容之前发生。 |
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PreSendRequestHeaders | 恰好在 ASP.NET 向客户端发送 HTTP 标头之前发生。 |
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ReleaseRequestState | 在 ASP.NET 执行完所有请求事件处理程序后发生。 该事件将使状态模块保存当前状态数据。 |
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RequestCompleted | 发生，在与该请求已释放的托管对象。 |
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ResolveRequestCache | 在 ASP.NET 完成授权事件以使缓存模块从缓存中为请求提供服务后发生，从而绕过事件处理程序（例如某个页或 XML Web services）的执行。 |
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UpdateRequestCache | 当 ASP.NET 执行完事件处理程序以使缓存模块存储将用于从缓存为后续请求提供服务的响应时发生。 |
看一下上面的管线处理请求中标号的10和15，分别是创建前台页面类和调用页面类的ProcessRequest方法的地方。这在我们的上篇文章中说到了。下面我们重点说Application_Start方法执行的地方，ProcessRequest方法都做了什么。
我们都知道Application_Start是程序的入口地方，类似与我们的main函数。但是我在msdn上也没能查到Application_Start是在哪里调用了，但是我们似乎是可以找到这个方法调用的地方，让我们来反编译HttpRuntime(为什么选择反编译这个类？上篇文章里面会有答案)的ProcessRequestNow（）方法，继续看_theRuntime.ProcessRequestInternal(wr);我们看ProcessRequestInternal方法中的IHttpHandler applicationInstance = HttpApplicationFactory.GetApplicationInstance(context);，我们可以看出来HttpApplicationFactory是个静态类，我们可以看到该静态类里面有成员internal const string applicationFileName = "global.asax";private static HttpApplicationFactory _theApplicationFactory;private bool _appOnStartCalled;这里我们知道了为什么global.asax文件为什么不能修改文件名，因为这里已经写死了。而后面_appOnStartCalled变量记录着程序的application_start方法是否被调用过，如没被调用过，则为false，进而调用程序的application_start,反之则不进行调用。看GetApplicationInstance中会有判断过程_theApplicationFactory.EnsureAppStartCalled(context);。所以程序的Application_Start()方法的执行顺序肯定先于所有的管线处理请求中的事件。
下面我们来看一下页面的ProcessRequest方法都做了什么操作。也就是开始页面生命周期。
我新建了一个ReflectWeb项目，又添加了demo.aspx页面，页面内容如下
1 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Demo.aspx.cs" Inherits="ReflectorWeb.Demo" %> 2 3 <!DOCTYPE html> 4 5 <html xmlns="http://www.w3.org/1999/xhtml"> 6 <head runat="server"> 7 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 8 <title></title> 9 </head> 10 <body> 11 <form id="form1" runat="server"> 12 <div> 13 程序集位置:<%=this.GetType().Assembly.Location %><br /> 14 TextBox1:<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br /> 15 TextBox2:<input type="text" runat="server" id="TextBox2" /><br /> 16 TextBox3:<input type="text" id="TextBox3" /><br /> 17 </div> 18 </form> 19 </body> 20 </html>
后台类内容很简单
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Web; 5 using System.Web.UI; 6 using System.Web.UI.WebControls; 7 8 namespace ReflectorWeb 9 { 10 public partial class Demo : System.Web.UI.Page 11 { 12 protected void Page_Load(object sender, EventArgs e) 13 { 14 Console.WriteLine("test console"); 15 //byte[] tempData = System.Text.Encoding.UTF8.GetBytes("测试Page_Load方法中使用Response.Write方法输出"); 16 Response.Write("测试Page_Load方法中使用Response.Write方法输出"); 17 } 18 } 19 }
而页面效果如下
下面我们来反编译一下这个程序集，看一下这个程序集里面的内容
程序集里面有个demo_aspx类，这就是我们前台页面生成后的类了，页面类代码如下：
1 [CompilerGlobalScope] 2 public class demo_aspx : Demo, IRequiresSessionState, IHttpHandler 3 { 4 // Fields 5 private static object __fileDependencies; 6 private static bool __initialized; 7 private static MethodInfo __PageInspector_BeginRenderTracingMethod; 8 private static MethodInfo __PageInspector_EndRenderTracingMethod; 9 private static MethodInfo __PageInspector_SetTraceDataMethod; 10 11 // Methods 12 static demo_aspx(); 13 [DebuggerNonUserCode] 14 public demo_aspx(); 15 [DebuggerNonUserCode] 16 private LiteralControl __BuildControl__control2(); 17 [DebuggerNonUserCode] 18 private HtmlHead __BuildControl__control3(); 19 [DebuggerNonUserCode] 20 private HtmlMeta __BuildControl__control4(); 21 [DebuggerNonUserCode] 22 private HtmlTitle __BuildControl__control5(); 23 [DebuggerNonUserCode] 24 private LiteralControl __BuildControl__control6(); 25 [DebuggerNonUserCode] 26 private LiteralControl __BuildControl__control7(); 27 [DebuggerNonUserCode] 28 private HtmlForm __BuildControlform1(); 29 [DebuggerNonUserCode] 30 private TextBox __BuildControlTextBox1(); 31 [DebuggerNonUserCode] 32 private HtmlInputText __BuildControlTextBox2(); 33 [DebuggerNonUserCode] 34 private void __BuildControlTree(demo_aspx __ctrl); 35 private void __PageInspector_BeginRenderTracing(object[] parameters); 36 private void __PageInspector_EndRenderTracing(object[] parameters); 37 private static MethodInfo __PageInspector_LoadHelper(string helperName); 38 private void __PageInspector_SetTraceData(object[] parameters); 39 private void __Renderform1(HtmlTextWriter __w, Control parameterContainer); 40 [DebuggerNonUserCode] 41 protected override void FrameworkInitialize(); 42 [DebuggerNonUserCode] 43 public override int GetTypeHashCode(); 44 [DebuggerNonUserCode] 45 public override void ProcessRequest(HttpContext context); 46 47 // Properties 48 protected HttpApplication ApplicationInstance { get; } 49 protected DefaultProfile Profile { get; } 50 } 51 52 53 Expand Methods 54
注意一下，该类继承自Demo类，也就是后台类，而后台类又继承自Page类。下面进入ProcessRequest方法 又调用了父类的ProcessRequest方法base.ProcessRequest(context);这个Page类的一个方法，看这个类的组成
1 [Designer("Microsoft.VisualStudio.Web.WebForms.WebFormDesigner, Microsoft.VisualStudio.Web, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(IRootDesigner)), DefaultEvent("Load"), ToolboxItem(false), DesignerCategory("ASPXCodeBehind"), DesignerSerializer("Microsoft.VisualStudio.Web.WebForms.WebFormCodeDomSerializer, Microsoft.VisualStudio.Web, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", "System.ComponentModel.Design.Serialization.TypeCodeDomSerializer, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")] 2 public class Page : TemplateControl, IHttpHandler 3 { 4 // Fields 5 internal HttpApplicationState _application; 6 private bool _aspCompatMode; 7 private AspCompatApplicationStep _aspCompatStep; 8 private bool _asyncMode; 9 private PageAsyncTaskManager _asyncTaskManager; 10 private TimeSpan _asyncTimeout; 11 private bool _asyncTimeoutSet; 12 private Control _autoPostBackControl; 13 internal Cache _cache; 14 private bool _cachedRequestViewState; 15 private ICallbackEventHandler _callbackControl; 16 private ArrayList _changedPostDataConsumers; 17 private string _clientQueryString; 18 private ClientScriptManager _clientScriptManager; 19 private string _clientState; 20 private bool _clientSupportsJavaScript; 21 private bool _clientSupportsJavaScriptChecked; 22 private string _clientTarget; 23 private bool _containsCrossPagePost; 24 private bool _containsEncryptedViewState; 25 private IDictionary _contentTemplateCollection; 26 internal HttpContext _context; 27 private ArrayList _controlsRequiringPostBack; 28 private StringSet _controlStateLoadedControlIds; 29 private Stack _dataBindingContext; 30 private string _descriptionToBeSet; 31 private bool _designMode; 32 private bool _designModeChecked; 33 private CultureInfo _dynamicCulture; 34 private CultureInfo _dynamicUICulture; 35 private ArrayList _enabledControls; 36 private bool _enableEventValidation; 37 private bool _enableViewStateMac; 38 private ViewStateEncryptionMode _encryptionMode; 39 internal string _errorPage; 40 private Control _focusedControl; 41 private string _focusedControlID; 42 private bool _fOnFormRenderCalled; 43 private HtmlForm _form; 44 private bool _fPageLayoutChanged; 45 private bool _fPostBackScriptRendered; 46 private bool _fRequirePostBackScript; 47 private bool _fRequireWebFormsScript; 48 private bool _fWebFormsScriptRendered; 49 private bool _haveIdSeparator; 50 private HtmlHead _header; 51 internal Dictionary<string, string> _hiddenFieldsToRender; 52 private char _idSeparator; 53 private bool _inOnFormRender; 54 private bool _isCallback; 55 private bool _isCrossPagePostBack; 56 private IDictionary _items; 57 private string _keywordsToBeSet; 58 private NameValueCollection _leftoverPostData; 59 private LegacyPageAsyncInfo _legacyAsyncInfo; 60 private LegacyPageAsyncTaskManager _legacyAsyncTaskManager; 61 private bool _maintainScrollPosition; 62 private MasterPage _master; 63 private VirtualPath _masterPageFile; 64 private static readonly TimeSpan _maxAsyncTimeout; 65 private int _maxPageStateFieldLength; 66 private ModelBindingExecutionContext _modelBindingExecutionContext; 67 private ModelStateDictionary _modelState; 68 private bool _needToPersistViewState; 69 private PageAdapter _pageAdapter; 70 private SimpleBitVector32 _pageFlags; 71 private Stack _partialCachingControlStack; 72 private PageStatePersister _persister; 73 private RenderMethod _postFormRenderDelegate; 74 private bool _preInitWorkComplete; 75 private Page _previousPage; 76 private VirtualPath _previousPagePath; 77 private bool _profileTreeBuilt; 78 internal HybridDictionary _registeredControlsRequiringClearChildControlState; 79 internal ControlSet _registeredControlsRequiringControlState; 80 private ArrayList _registeredControlsThatRequirePostBack; 81 private IPostBackEventHandler _registeredControlThatRequireRaiseEvent; 82 private string _relativeFilePath; 83 internal HttpRequest _request; 84 private NameValueCollection _requestValueCollection; 85 private string _requestViewState; 86 private bool _requireFocusScript; 87 private bool _requireScrollScript; 88 internal HttpResponse _response; 89 private static Type _scriptManagerType; 90 private int _scrollPositionX; 91 private const string _scrollPositionXID = "__SCROLLPOSITIONX"; 92 private int _scrollPositionY; 93 private const string _scrollPositionYID = "__SCROLLPOSITIONY"; 94 private HttpSessionState _session; 95 private bool _sessionRetrieved; 96 private SmartNavigationSupport _smartNavSupport; 97 private PageTheme _styleSheet; 98 private string _styleSheetName; 99 private int _supportsStyleSheets; 100 private PageTheme _theme; 101 private string _themeName; 102 private string _titleToBeSet; 103 private int _transactionMode; 104 private string _uniqueFilePathSuffix; 105 private UnobtrusiveValidationMode? _unobtrusiveValidationMode; 106 private NameValueCollection _unvalidatedRequestValueCollection; 107 private bool _validated; 108 private string _validatorInvalidControl; 109 private ValidatorCollection _validators; 110 private bool _viewStateEncryptionRequested; 111 private string _viewStateUserKey; 112 private XhtmlConformanceMode _xhtmlConformanceMode; 113 private bool _xhtmlConformanceModeSet; 114 internal const bool BufferDefault = true; 115 internal const string callbackID = "__CALLBACKID"; 116 internal const string callbackIndexID = "__CALLBACKINDEX"; 117 internal const string callbackLoadScriptID = "__CALLBACKLOADSCRIPT"; 118 internal const string callbackParameterID = "__CALLBACKPARAM"; 119 internal static readonly int DefaultAsyncTimeoutSeconds; 120 internal static readonly int DefaultMaxPageStateFieldLength; 121 private const string EnabledControlArray = "__enabledControlArray"; 122 internal const bool EnableEventValidationDefault = true; 123 internal const bool EnableViewStateMacDefault = true; 124 internal const ViewStateEncryptionMode EncryptionModeDefault = ViewStateEncryptionMode.Auto; 125 internal static readonly object EventInitComplete; 126 internal static readonly object EventLoadComplete; 127 internal static readonly object EventPreInit; 128 internal static readonly object EventPreLoad; 129 internal static readonly object EventPreRenderComplete; 130 internal static readonly object EventSaveStateComplete; 131 internal const string EventValidationPrefixID = "__EVENTVALIDATION"; 132 private static readonly Version FocusMinimumEcmaVersion; 133 private static readonly Version FocusMinimumJScriptVersion; 134 private const string HiddenClassName = "aspNetHidden"; 135 private const int isCrossPagePostRequest = 8; 136 private const int isExportingWebPart = 2; 137 private const int isExportingWebPartShared = 4; 138 private const int isPartialRenderingSupported = 0x10; 139 private const int isPartialRenderingSupportedSet = 0x20; 140 private static readonly Version JavascriptMinimumVersion; 141 private const string lastFocusID = "__LASTFOCUS"; 142 internal const bool MaintainScrollPositionOnPostBackDefault = false; 143 private static readonly Version MSDomScrollMinimumVersion; 144 private const string PageID = "__Page"; 145 private const string PageReEnableControlsScriptKey = "PageReEnableControlsScript"; 146 private const string PageRegisteredControlsThatRequirePostBackKey = "__ControlsRequirePostBackKey__"; 147 private const string PageScrollPositionScriptKey = "PageScrollPositionScript"; 148 private const string PageSubmitScriptKey = "PageSubmitScript"; 149 [EditorBrowsable(EditorBrowsableState.Never)] 150 public const string postEventArgumentID = "__EVENTARGUMENT"; 151 [EditorBrowsable(EditorBrowsableState.Never)] 152 public const string postEventSourceID = "__EVENTTARGET"; 153 internal const string previousPageID = "__PREVIOUSPAGE"; 154 private static StringSet s_systemPostFields; 155 private static char[] s_varySeparator; 156 private const int skipFormActionValidation = 0x40; 157 internal const bool SmartNavigationDefault = false; 158 private const int styleSheetInitialized = 1; 159 internal const string systemPostFieldPrefix = "__"; 160 private static readonly string UniqueFilePathSuffixID; 161 internal const string ViewStateEncryptionID = "__VIEWSTATEENCRYPTED"; 162 internal const string ViewStateFieldCountID = "__VIEWSTATEFIELDCOUNT"; 163 internal const string ViewStateFieldPrefixID = "__VIEWSTATE"; 164 internal const string WebPartExportID = "__WEBPARTEXPORT"; 165 166 // Events 167 [EditorBrowsable(EditorBrowsableState.Advanced)] 168 public event EventHandler InitComplete; 169 [EditorBrowsable(EditorBrowsableState.Advanced)] 170 public event EventHandler LoadComplete; 171 public event EventHandler PreInit; 172 [EditorBrowsable(EditorBrowsableState.Advanced)] 173 public event EventHandler PreLoad; 174 [EditorBrowsable(EditorBrowsableState.Advanced)] 175 public event EventHandler PreRenderComplete; 176 [EditorBrowsable(EditorBrowsableState.Advanced)] 177 public event EventHandler SaveStateComplete; 178 179 // Methods 180 static Page(); 181 public Page(); 182 [EditorBrowsable(EditorBrowsableState.Never)] 183 protected internal void AddContentTemplate(string templateName, ITemplate template); 184 [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 185 public void AddOnPreRenderCompleteAsync(BeginEventHandler beginHandler, EndEventHandler endHandler); 186 public void AddOnPreRenderCompleteAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 187 [EditorBrowsable(EditorBrowsableState.Never)] 188 protected internal void AddWrappedFileDependencies(object virtualFileDependencies); 189 internal void ApplyControlSkin(Control ctrl); 190 [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] 191 internal bool ApplyControlStyleSheet(Control ctrl); 192 private void ApplyMasterPage(); 193 [EditorBrowsable(EditorBrowsableState.Never)] 194 protected IAsyncResult AspCompatBeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData); 195 [EditorBrowsable(EditorBrowsableState.Never)] 196 protected void AspCompatEndProcessRequest(IAsyncResult result); 197 [EditorBrowsable(EditorBrowsableState.Never)] 198 protected IAsyncResult AsyncPageBeginProcessRequest(HttpContext context, AsyncCallback callback, object extraData); 199 [EditorBrowsable(EditorBrowsableState.Never)] 200 protected void AsyncPageEndProcessRequest(IAsyncResult result); 201 private void AsyncPageProcessRequestBeforeAsyncPointCancellableCallback(object state); 202 internal void BeginFormRender(HtmlTextWriter writer, string formUniqueID); 203 private void BuildPageProfileTree(bool enableViewState); 204 private void CheckRemainingAsyncTasks(bool isThreadAbort); 205 private CancellationTokenSource CreateCancellationTokenFromAsyncTimeout(); 206 [EditorBrowsable(EditorBrowsableState.Advanced)] 207 protected internal virtual HtmlTextWriter CreateHtmlTextWriter(TextWriter tw); 208 public static HtmlTextWriter CreateHtmlTextWriterFromType(TextWriter tw, Type writerType); 209 internal static HtmlTextWriter CreateHtmlTextWriterInternal(TextWriter tw, HttpRequest request); 210 internal IStateFormatter2 CreateStateFormatter(); 211 private CultureInfo CultureFromUserLanguages(bool specific); 212 internal ICollection DecomposeViewStateIntoChunks(); 213 internal static string DecryptString(string s, Purpose purpose); 214 [EditorBrowsable(EditorBrowsableState.Never)] 215 public void DesignerInitialize(); 216 private bool DetermineIsExportingWebPart(); 217 [EditorBrowsable(EditorBrowsableState.Advanced)] 218 protected internal virtual NameValueCollection DeterminePostBackMode(); 219 [EditorBrowsable(EditorBrowsableState.Advanced)] 220 protected internal virtual NameValueCollection DeterminePostBackModeUnvalidated(); 221 internal static string EncryptString(string s, Purpose purpose); 222 internal void EndFormRender(HtmlTextWriter writer, string formUniqueID); 223 internal void EndFormRenderArrayAndExpandoAttribute(HtmlTextWriter writer, string formUniqueID); 224 internal void EndFormRenderHiddenFields(HtmlTextWriter writer, string formUniqueID); 225 internal void EndFormRenderPostBackAndWebFormsScript(HtmlTextWriter writer, string formUniqueID); 226 public void ExecuteRegisteredAsyncTasks(); 227 private void ExportWebPart(string exportedWebPartID); 228 public override Control FindControl(string id); 229 protected override void FrameworkInitialize(); 230 internal NameValueCollection GetCollectionBasedOnMethod(bool dontReturnNull); 231 public object GetDataItem(); 232 internal bool GetDesignModeInternal(); 233 [Obsolete("The recommended alternative is ClientScript.GetPostBackEventReference. http://go.microsoft.com/fwlink/?linkid=14202"), EditorBrowsable(EditorBrowsableState.Advanced)] 234 public string GetPostBackClientEvent(Control control, string argument); 235 [EditorBrowsable(EditorBrowsableState.Advanced), Obsolete("The recommended alternative is ClientScript.GetPostBackClientHyperlink. http://go.microsoft.com/fwlink/?linkid=14202")] 236 public string GetPostBackClientHyperlink(Control control, string argument); 237 [Obsolete("The recommended alternative is ClientScript.GetPostBackEventReference. http://go.microsoft.com/fwlink/?linkid=14202"), EditorBrowsable(EditorBrowsableState.Advanced)] 238 public string GetPostBackEventReference(Control control); 239 [Obsolete("The recommended alternative is ClientScript.GetPostBackEventReference. http://go.microsoft.com/fwlink/?linkid=14202"), EditorBrowsable(EditorBrowsableState.Advanced)] 240 public string GetPostBackEventReference(Control control, string argument); 241 [EditorBrowsable(EditorBrowsableState.Never)] 242 public virtual int GetTypeHashCode(); 243 internal override string GetUniqueIDPrefix(); 244 public ValidatorCollection GetValidators(string validationGroup); 245 internal WithinCancellableCallbackTaskAwaitable GetWaitForPreviousStepCompletionAwaitable(); 246 [EditorBrowsable(EditorBrowsableState.Never)] 247 protected object GetWrappedFileDependencies(string[] virtualFileDependencies); 248 private bool HandleError(Exception e); 249 protected virtual void InitializeCulture(); 250 internal void InitializeStyleSheet(); 251 private void InitializeThemes(); 252 private void InitializeWriter(HtmlTextWriter writer); 253 [EditorBrowsable(EditorBrowsableState.Never)] 254 protected internal virtual void InitOutputCache(OutputCacheParameters cacheSettings); 255 [EditorBrowsable(EditorBrowsableState.Never), TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] 256 protected virtual void InitOutputCache(int duration, string varyByHeader, string varyByCustom, OutputCacheLocation location, string varyByParam); 257 [EditorBrowsable(EditorBrowsableState.Never)] 258 protected virtual void InitOutputCache(int duration, string varyByContentEncoding, string varyByHeader, string varyByCustom, OutputCacheLocation location, string varyByParam); 259 [Obsolete("The recommended alternative is ClientScript.IsClientScriptBlockRegistered(string key). http://go.microsoft.com/fwlink/?linkid=14202")] 260 public bool IsClientScriptBlockRegistered(string key); 261 [Obsolete("The recommended alternative is ClientScript.IsStartupScriptRegistered(string key). http://go.microsoft.com/fwlink/?linkid=14202")] 262 public bool IsStartupScriptRegistered(string key); 263 internal static bool IsSystemPostField(string field); 264 private IAsyncResult LegacyAsyncPageBeginProcessRequest(HttpContext context, AsyncCallback callback, object extraData); 265 private void LegacyAsyncPageEndProcessRequest(IAsyncResult result); 266 private void LoadAllState(); 267 [EditorBrowsable(EditorBrowsableState.Advanced)] 268 protected internal virtual object LoadPageStateFromPersistenceMedium(); 269 internal void LoadScrollPosition(); 270 public string MapPath(string virtualPath); 271 internal void OnFormPostRender(HtmlTextWriter writer); 272 internal void OnFormRender(); 273 protected internal override void OnInit(EventArgs e); 274 protected virtual void OnInitComplete(EventArgs e); 275 protected virtual void OnLoadComplete(EventArgs e); 276 protected virtual void OnPreInit(EventArgs e); 277 protected virtual void OnPreLoad(EventArgs e); 278 protected virtual void OnPreRenderComplete(EventArgs e); 279 protected virtual void OnSaveStateComplete(EventArgs e); 280 private void PerformPreInit(); 281 [DebuggerStepThrough, AsyncStateMachine(typeof(<PerformPreInitAsync>d__c))] 282 private Task PerformPreInitAsync(); 283 private void PerformPreRenderComplete(); 284 internal void PopCachingControl(); 285 internal void PopDataBindingContext(); 286 private void PrepareCallback(string callbackControlID); 287 [AsyncStateMachine(typeof(<PrepareCallbackAsync>d__1f)), DebuggerStepThrough] 288 private Task PrepareCallbackAsync(string callbackControlID); 289 private void ProcessPostData(NameValueCollection postData, bool fBeforeLoad); 290 private void ProcessRequest(); 291 [EditorBrowsable(EditorBrowsableState.Never)] 292 public virtual void ProcessRequest(HttpContext context); 293 private void ProcessRequest(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint); 294 [AsyncStateMachine(typeof(<ProcessRequestAsync>d__2c)), DebuggerStepThrough] 295 private Task ProcessRequestAsync(HttpContext context); 296 [DebuggerStepThrough, AsyncStateMachine(typeof(<ProcessRequestAsync>d__10))] 297 private Task ProcessRequestAsync(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint); 298 private void ProcessRequestCleanup(); 299 private void ProcessRequestEndTrace(); 300 private void ProcessRequestMain(); 301 private void ProcessRequestMain(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint); 302 [DebuggerStepThrough, AsyncStateMachine(typeof(<ProcessRequestMainAsync>d__14))] 303 private Task ProcessRequestMainAsync(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint); 304 private void ProcessRequestTransacted(); 305 [PermissionSet(SecurityAction.Assert, Unrestricted=true)] 306 private void ProcessRequestWithAssert(HttpContext context); 307 private void ProcessRequestWithNoAssert(HttpContext context); 308 internal void PushCachingControl(BasePartialCachingControl c); 309 internal void PushDataBindingContext(object dataItem); 310 internal void RaiseChangedEvents(); 311 [DebuggerStepThrough, AsyncStateMachine(typeof(<RaiseChangedEventsAsync>d__5))] 312 internal Task RaiseChangedEventsAsync(); 313 private void RaisePostBackEvent(NameValueCollection postData); 314 [EditorBrowsable(EditorBrowsableState.Advanced)] 315 protected virtual void RaisePostBackEvent(IPostBackEventHandler sourceControl, string eventArgument); 316 [Obsolete("The recommended alternative is ClientScript.RegisterArrayDeclaration(string arrayName, string arrayValue). http://go.microsoft.com/fwlink/?linkid=14202"), EditorBrowsable(EditorBrowsableState.Advanced)] 317 public void RegisterArrayDeclaration(string arrayName, string arrayValue); 318 public void RegisterAsyncTask(PageAsyncTask task); 319 [Obsolete("The recommended alternative is ClientScript.RegisterClientScriptBlock(Type type, string key, string script). http://go.microsoft.com/fwlink/?linkid=14202"), EditorBrowsable(EditorBrowsableState.Advanced)] 320 public virtual void RegisterClientScriptBlock(string key, string script); 321 internal void RegisterEnabledControl(Control control); 322 internal void RegisterFocusScript(); 323 [EditorBrowsable(EditorBrowsableState.Advanced), Obsolete("The recommended alternative is ClientScript.RegisterHiddenField(string hiddenFieldName, string hiddenFieldInitialValue). http://go.microsoft.com/fwlink/?linkid=14202")] 324 public virtual void RegisterHiddenField(string hiddenFieldName, string hiddenFieldInitialValue); 325 [Obsolete("The recommended alternative is ClientScript.RegisterOnSubmitStatement(Type type, string key, string script). http://go.microsoft.com/fwlink/?linkid=14202"), EditorBrowsable(EditorBrowsableState.Advanced)] 326 public void RegisterOnSubmitStatement(string key, string script); 327 internal void RegisterPostBackScript(); 328 internal void RegisterRequiresClearChildControlState(Control control); 329 [EditorBrowsable(EditorBrowsableState.Advanced)] 330 public void RegisterRequiresControlState(Control control); 331 [EditorBrowsable(EditorBrowsableState.Advanced)] 332 public void RegisterRequiresPostBack(Control control); 333 [EditorBrowsable(EditorBrowsableState.Advanced)] 334 public virtual void RegisterRequiresRaiseEvent(IPostBackEventHandler control); 335 public void RegisterRequiresViewStateEncryption(); 336 [EditorBrowsable(EditorBrowsableState.Advanced), Obsolete("The recommended alternative is ClientScript.RegisterStartupScript(Type type, string key, string script). http://go.microsoft.com/fwlink/?linkid=14202")] 337 public virtual void RegisterStartupScript(string key, string script); 338 [EditorBrowsable(EditorBrowsableState.Advanced)] 339 public void RegisterViewStateHandler(); 340 internal void RegisterWebFormsScript(); 341 protected internal override void Render(HtmlTextWriter writer); 342 private void RenderCallback(); 343 private bool RenderDivAroundHiddenInputs(HtmlTextWriter writer); 344 private void RenderPostBackScript(HtmlTextWriter writer, string formUniqueID); 345 internal void RenderViewStateFields(HtmlTextWriter writer); 346 private void RenderWebFormsScript(HtmlTextWriter writer); 347 public bool RequiresControlState(Control control); 348 internal void ResetOnFormRenderCalled(); 349 private void RestoreCultures(Thread currentThread, CultureInfo prevCulture, CultureInfo prevUICulture); 350 private void SaveAllState(); 351 [EditorBrowsable(EditorBrowsableState.Advanced)] 352 protected internal virtual void SavePageStateToPersistenceMedium(object state); 353 internal void SetActiveValueProvider(IValueProvider valueProvider); 354 private void SetCulture(Thread currentThread, CultureInfo currentCulture, CultureInfo currentUICulture); 355 [SecurityPermission(SecurityAction.Assert, ControlThread=true)] 356 private void SetCultureWithAssert(Thread currentThread, CultureInfo currentCulture, CultureInfo currentUICulture); 357 public void SetFocus(string clientID); 358 public void SetFocus(Control control); 359 internal void SetForm(HtmlForm form); 360 internal void SetHeader(HtmlHead header); 361 private void SetIntrinsics(HttpContext context); 362 private void SetIntrinsics(HttpContext context, bool allowAsync); 363 internal void SetPostFormRenderDelegate(RenderMethod renderMethod); 364 internal void SetPreviousPage(Page previousPage); 365 internal void SetValidatorInvalidControlFocus(string clientID); 366 internal bool ShouldLoadControlState(Control control); 367 [SecurityPermission(SecurityAction.Assert, ControlThread=true)] 368 internal static void ThreadResetAbortWithAssert(); 369 public virtual bool TryUpdateModel<TModel>(TModel model) where TModel: class; 370 public virtual bool TryUpdateModel<TModel>(TModel model, IValueProvider valueProvider) where TModel: class; 371 internal override void UnloadRecursive(bool dispose); 372 [EditorBrowsable(EditorBrowsableState.Advanced)] 373 public void UnregisterRequiresControlState(Control control); 374 public virtual void UpdateModel<TModel>(TModel model) where TModel: class; 375 public virtual void UpdateModel<TModel>(TModel model, IValueProvider valueProvider) where TModel: class; 376 public virtual void Validate(); 377 public virtual void Validate(string validationGroup); 378 private void ValidateRawUrlIfRequired(); 379 [EditorBrowsable(EditorBrowsableState.Advanced)] 380 public virtual void VerifyRenderingInServerForm(Control control); 381 382 // Properties 383 private IValueProvider ActiveValueProvider { [CompilerGenerated, TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; [CompilerGenerated] set; } 384 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 385 public HttpApplicationState Application { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 386 [EditorBrowsable(EditorBrowsableState.Never)] 387 protected bool AspCompatMode { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] set; } 388 [EditorBrowsable(EditorBrowsableState.Never)] 389 protected bool AsyncMode { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] set; } 390 [Browsable(false), EditorBrowsable(EditorBrowsableState.Advanced), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 391 public TimeSpan AsyncTimeout { get; set; } 392 public Control AutoPostBackControl { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] set; } 393 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), EditorBrowsable(EditorBrowsableState.Never), Browsable(false)] 394 public bool Buffer { get; set; } 395 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 396 public Cache Cache { get; } 397 internal string ClientOnSubmitEvent { get; } 398 public string ClientQueryString { get; } 399 public ClientScriptManager ClientScript { get; } 400 internal string ClientState { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] set; } 401 internal bool ClientSupportsFocus { get; } 402 internal bool ClientSupportsJavaScript { get; } 403 [WebSysDescription("Page_ClientTarget"), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), DefaultValue(""), Browsable(false), EditorBrowsable(EditorBrowsableState.Advanced)] 404 public string ClientTarget { get; set; } 405 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), EditorBrowsable(EditorBrowsableState.Never), Browsable(false)] 406 public int CodePage { get; set; } 407 internal bool ContainsCrossPagePost { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] set; } 408 internal bool ContainsEncryptedViewState { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] set; } 409 internal bool ContainsTheme { get; } 410 [EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 411 public string ContentType { get; set; } 412 protected internal override HttpContext Context { [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] get; } 413 private StringSet ControlStateLoadedControlIds { get; } 414 [Browsable(false), EditorBrowsable(EditorBrowsableState.Advanced), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 415 public string Culture { get; set; } 416 internal CultureInfo DynamicCulture { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 417 internal CultureInfo DynamicUICulture { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 418 private ArrayList EnabledControls { get; } 419 [DefaultValue(true), Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), EditorBrowsable(EditorBrowsableState.Never)] 420 public virtual bool EnableEventValidation { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; set; } 421 [Browsable(false)] 422 public override bool EnableViewState { get; set; } 423 [EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 424 public bool EnableViewStateMac { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; set; } 425 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false), WebSysDescription("Page_ErrorPage"), DefaultValue("")] 426 public string ErrorPage { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] set; } 427 [Obsolete("The recommended alternative is HttpResponse.AddFileDependencies. http://go.microsoft.com/fwlink/?linkid=14202"), EditorBrowsable(EditorBrowsableState.Never)] 428 protected ArrayList FileDependencies { set; } 429 internal Control FocusedControl { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 430 internal string FocusedControlID { get; } 431 public HtmlForm Form { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 432 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 433 public HtmlHead Header { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 434 [EditorBrowsable(EditorBrowsableState.Never), Browsable(false)] 435 public override string ID { get; set; } 436 [EditorBrowsable(EditorBrowsableState.Never), Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 437 public virtual char IdSeparator { get; } 438 public bool IsAsync { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 439 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 440 public bool IsCallback { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 441 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 442 public bool IsCrossPagePostBack { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 443 internal bool IsExportingWebPart { get; } 444 internal bool IsExportingWebPartShared { get; } 445 internal bool IsInAspCompatMode { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 446 internal bool IsInOnFormRender { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 447 internal bool IsPartialRenderingSupported { get; } 448 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 449 public bool IsPostBack { get; } 450 public bool IsPostBackEventControlRegistered { get; } 451 [EditorBrowsable(EditorBrowsableState.Never), Browsable(false)] 452 public bool IsReusable { get; } 453 internal bool IsTransacted { get; } 454 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 455 public bool IsValid { get; } 456 [Browsable(false)] 457 public IDictionary Items { get; } 458 internal string LastFocusedControl { [AspNetHostingPermission(SecurityAction.Assert, Level=AspNetHostingPermissionLevel.Low)] get; } 459 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), EditorBrowsable(EditorBrowsableState.Never), Browsable(false)] 460 public int LCID { get; set; } 461 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 462 public bool MaintainScrollPositionOnPostBack { get; set; } 463 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), WebSysDescription("MasterPage_MasterPage"), Browsable(false)] 464 public MasterPage Master { get; } 465 [WebSysDescription("MasterPage_MasterPageFile"), DefaultValue(""), WebCategory("Behavior")] 466 public virtual string MasterPageFile { get; set; } 467 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false), EditorBrowsable(EditorBrowsableState.Never)] 468 public int MaxPageStateFieldLength { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; set; } 469 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Bindable(true), Localizable(true)] 470 public string MetaDescription { get; set; } 471 [Localizable(true), Bindable(true), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 472 public string MetaKeywords { get; set; } 473 public ModelBindingExecutionContext ModelBindingExecutionContext { get; } 474 public ModelStateDictionary ModelState { get; } 475 public PageAdapter PageAdapter { get; } 476 protected virtual PageStatePersister PageStatePersister { get; } 477 internal Stack PartialCachingControlStack { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 478 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 479 public Page PreviousPage { get; } 480 internal string RelativeFilePath { get; } 481 private bool RenderDisabledControlsScript { get; } 482 internal bool RenderFocusScript { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 483 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 484 public HttpRequest Request { [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] get; } 485 internal HttpRequest RequestInternal { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 486 internal NameValueCollection RequestValueCollection { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; } 487 internal string RequestViewStateString { get; } 488 internal bool RequiresViewStateEncryptionInternal { get; } 489 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 490 public HttpResponse Response { get; } 491 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), EditorBrowsable(EditorBrowsableState.Never), Browsable(false)] 492 public string ResponseEncoding { get; set; } 493 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 494 public RouteData RouteData { get; } 495 internal IScriptManager ScriptManager { get; } 496 internal Type ScriptManagerType { get; set; } 497 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 498 public HttpServerUtility Server { get; } 499 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 500 public virtual HttpSessionState Session { get; } 501 [EditorBrowsable(EditorBrowsableState.Never), Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), DefaultValue(false)] 502 public bool SkipFormActionValidation { get; set; } 503 [Filterable(false), Browsable(false), Obsolete("The recommended alternative is Page.SetFocus and Page.MaintainScrollPositionOnPostBack. http://go.microsoft.com/fwlink/?linkid=14202")] 504 public bool SmartNavigation { get; set; } 505 [Filterable(false), Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 506 public virtual string StyleSheetTheme { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; set; } 507 internal bool SupportsStyleSheets { get; } 508 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 509 public virtual string Theme { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; set; } 510 [Bindable(true), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Localizable(true)] 511 public string Title { get; set; } 512 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 513 public TraceContext Trace { get; } 514 [EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 515 public bool TraceEnabled { get; set; } 516 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), EditorBrowsable(EditorBrowsableState.Never)] 517 public TraceMode TraceModeValue { get; set; } 518 [EditorBrowsable(EditorBrowsableState.Never)] 519 protected int TransactionMode { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] set; } 520 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), EditorBrowsable(EditorBrowsableState.Advanced), Browsable(false)] 521 public string UICulture { get; set; } 522 protected internal virtual string UniqueFilePathSuffix { get; } 523 [WebSysDescription("Page_UnobtrusiveValidationMode"), DefaultValue(0), WebCategory("Behavior")] 524 public UnobtrusiveValidationMode UnobtrusiveValidationMode { get; set; } 525 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)] 526 public IPrincipal User { get; } 527 [EditorBrowsable(EditorBrowsableState.Never), Browsable(false), DefaultValue(2)] 528 public override ValidateRequestMode ValidateRequestMode { get; set; } 529 internal string ValidatorInvalidControl { get; } 530 [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 531 public ValidatorCollection Validators { get; } 532 [Browsable(false), DefaultValue(0), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), EditorBrowsable(EditorBrowsableState.Never)] 533 public ViewStateEncryptionMode ViewStateEncryptionMode { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; set; } 534 [Browsable(false)] 535 public string ViewStateUserKey { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; set; } 536 [Browsable(false)] 537 public override bool Visible { [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] get; set; } 538 internal XhtmlConformanceMode XhtmlConformanceMode { get; } 539 540 // Nested Types 541 [CompilerGenerated] 542 private struct <PerformPreInitAsync>d__c : IAsyncStateMachine 543 { 544 // Fields 545 public int <>1__state; 546 public Page <>4__this; 547 public IDisposable <>7__wrapd; 548 public AsyncTaskMethodBuilder <>t__builder; 549 private object <>t__stack; 550 private WithinCancellableCallbackTaskAwaitable.WithinCancellableCallbackTaskAwaiter <>u__$awaitere; 551 552 // Methods 553 private void MoveNext(); 554 [DebuggerHidden] 555 private void SetStateMachine(IAsyncStateMachine param0); 556 } 557 558 [CompilerGenerated] 559 private struct <PrepareCallbackAsync>d__1f : IAsyncStateMachine 560 { 561 // Fields 562 public int <>1__state; 563 public Page <>4__this; 564 public IDisposable <>7__wrap21; 565 public AsyncTaskMethodBuilder <>t__builder; 566 private object <>t__stack; 567 private WithinCancellableCallbackTaskAwaitable.WithinCancellableCallbackTaskAwaiter <>u__$awaiter22; 568 public string <param>5__20; 569 public string callbackControlID; 570 571 // Methods 572 private void MoveNext(); 573 [DebuggerHidden] 574 private void SetStateMachine(IAsyncStateMachine param0); 575 } 576 577 [CompilerGenerated] 578 private struct <ProcessRequestAsync>d__10 : IAsyncStateMachine 579 { 580 // Fields 581 public int <>1__state; 582 public Page <>4__this; 583 public AsyncTaskMethodBuilder <>t__builder; 584 private object <>t__stack; 585 private WithinCancellableCallbackTaskAwaitable.WithinCancellableCallbackTaskAwaiter <>u__$awaiter12; 586 public bool <needToCallEndTrace>5__11; 587 public bool includeStagesAfterAsyncPoint; 588 public bool includeStagesBeforeAsyncPoint; 589 590 // Methods 591 private void MoveNext(); 592 [DebuggerHidden] 593 private void SetStateMachine(IAsyncStateMachine param0); 594 } 595 596 [CompilerGenerated] 597 private struct <ProcessRequestAsync>d__2c : IAsyncStateMachine 598 { 599 // Fields 600 public int <>1__state; 601 public Page <>4__this; 602 public AsyncTaskMethodBuilder <>t__builder; 603 private object <>t__stack; 604 private TaskAwaiter <>u__$awaiter2f; 605 public CancellationToken <cancellationToken>5__2e; 606 public CancellationTokenSource <cancellationTokenSource>5__2d; 607 public HttpContext context; 608 public Page.<>c__DisplayClass2a CS$<>8__locals2b; 609 610 // Methods 611 private void MoveNext(); 612 [DebuggerHidden] 613 private void SetStateMachine(IAsyncStateMachine param0); 614 } 615 616 [CompilerGenerated] 617 private struct <ProcessRequestMainAsync>d__14 : IAsyncStateMachine 618 { 619 // Fields 620 public int <>1__state; 621 public Page <>4__this; 622 public IDisposable <>7__wrap1a; 623 public IDisposable <>7__wrap1b; 624 public IDisposable <>7__wrap1c; 625 public IDisposable <>7__wrap1d; 626 public AsyncTaskMethodBuilder <>t__builder; 627 private object <>t__stack; 628 private WithinCancellableCallbackTaskAwaitable.WithinCancellableCallbackTaskAwaiter <>u__$awaiter19; 629 public string <callbackControlId>5__17; 630 public HttpContext <con>5__15; 631 public string <exportedWebPartID>5__16; 632 public Task <initRecursiveTask>5__18; 633 public bool includeStagesAfterAsyncPoint; 634 public bool includeStagesBeforeAsyncPoint; 635 636 // Methods 637 private void MoveNext(); 638 [DebuggerHidden] 639 private void SetStateMachine(IAsyncStateMachine param0); 640 } 641 642 [CompilerGenerated] 643 private struct <RaiseChangedEventsAsync>d__5 : IAsyncStateMachine 644 { 645 // Fields 646 public int <>1__state; 647 public Page <>4__this; 648 public IDisposable <>7__wrap9; 649 public AsyncTaskMethodBuilder <>t__builder; 650 private object <>t__stack; 651 private WithinCancellableCallbackTaskAwaitable.WithinCancellableCallbackTaskAwaiter <>u__$awaitera; 652 public Control <c>5__7; 653 public IPostBackDataHandler <changedPostDataConsumer>5__8; 654 public int <i>5__6; 655 656 // Methods 657 private void MoveNext(); 658 [DebuggerHidden] 659 private void SetStateMachine(IAsyncStateMachine param0); 660 } 661 662 private class LegacyPageAsyncInfo 663 { 664 // Fields 665 private HttpApplication _app; 666 private bool _asyncPointReached; 667 private HttpAsyncResult _asyncResult; 668 private ArrayList _beginHandlers; 669 private bool _callerIsBlocking; 670 private WaitCallback _callHandlersThreadpoolCallback; 671 private bool _completed; 672 private AsyncCallback _completionCallback; 673 private int _currentHandler; 674 private ArrayList _endHandlers; 675 private Exception _error; 676 private int _handlerCount; 677 private Page _page; 678 private ArrayList _stateObjects; 679 private AspNetSynchronizationContextBase _syncContext; 680 681 // Methods 682 internal LegacyPageAsyncInfo(Page page); 683 internal void AddHandler(BeginEventHandler beginHandler, EndEventHandler endHandler, object state); 684 internal void CallHandlers(bool onPageThread); 685 private void CallHandlersFromThreadpoolThread(object data); 686 private void CallHandlersPossiblyUnderLock(bool onPageThread); 687 private void OnAsyncHandlerCompletion(IAsyncResult ar); 688 internal void SetError(Exception error); 689 690 // Properties 691 internal bool AsyncPointReached { get; set; } 692 internal HttpAsyncResult AsyncResult { get; set; } 693 internal bool CallerIsBlocking { get; set; } 694 } 695 } 696 697 698 Expand Methods 699
内容好多啊，这也就是为什么我们在后台类中可以访问Response，Request，Server等属性的原因了。看下这个类的ProcessRequest
1 [EditorBrowsable(EditorBrowsableState.Never)] 2 public virtual void ProcessRequest(HttpContext context) 3 { 4 if ((HttpRuntime.NamedPermissionSet != null) && !HttpRuntime.DisableProcessRequestInApplicationTrust) 5 { 6 if (!HttpRuntime.ProcessRequestInApplicationTrust) 7 { 8 this.ProcessRequestWithAssert(context); 9 return; 10 } 11 if (base.NoCompile) 12 { 13 HttpRuntime.NamedPermissionSet.PermitOnly(); 14 } 15 } 16 this.ProcessRequestWithNoAssert(context); 17 } 18 19 20 21
进入---》this.ProcessRequestWithAssert(context);---》this.ProcessRequestWithNoAssert(context);---》this.ProcessRequest();---》this.ProcessRequest(true, true);仔细看下最后这个方法this.ProcessRequest(true, true);
1 private void ProcessRequest(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint) 2 { 3 if (includeStagesBeforeAsyncPoint) 4 { 5 this.FrameworkInitialize(); 6 base.ControlState = ControlState.FrameworkInitialized; 7 } 8 bool flag = this.Context.WorkerRequest is IIS7WorkerRequest; 9 try 10 { 11 try 12 { 13 if (this.IsTransacted) 14 { 15 this.ProcessRequestTransacted(); 16 } 17 else 18 { 19 this.ProcessRequestMain(includeStagesBeforeAsyncPoint, includeStagesAfterAsyncPoint); 20 } 21 if (includeStagesAfterAsyncPoint) 22 { 23 flag = false; 24 this.ProcessRequestEndTrace(); 25 } 26 } 27 catch (ThreadAbortException) 28 { 29 try 30 { 31 if (flag) 32 { 33 this.ProcessRequestEndTrace(); 34 } 35 } 36 catch 37 { 38 } 39 } 40 finally 41 { 42 if (includeStagesAfterAsyncPoint) 43 { 44 this.ProcessRequestCleanup(); 45 } 46 } 47 } 48 catch 49 { 50 throw; 51 } 52 } 53 54 55 56
注意一下this.FrameworkInitialize();这个FramworkInitiallize在Page类中是虚方法，而在页面类中重写了这个方法，其实通过this调用，也说明了这里这个方法是调用前台页面类的方法。看下前台页面类的FramworkInitialize方法。
1 [DebuggerNonUserCode] 2 protected override void FrameworkInitialize() 3 { 4 base.FrameworkInitialize(); 5 this.__BuildControlTree(this); 6 base.AddWrappedFileDependencies(__fileDependencies); 7 base.Request.ValidateInput(); 8 }
先调用了父类的FrameworkInitialize方法，我们主要看这句调用this.__BuildControlTree(this);从表面上我们可以看出是构建控件树，参数this，也就是将当前页面类对象当做参数传进去，我们进入到这个方法内部查看
1 [DebuggerNonUserCode] 2 private void __BuildControlTree(demo_aspx __ctrl) 3 { 4 this.InitializeCulture(); 5 LiteralControl __ctrl1 = this.__BuildControl__control2(); 6 IParserAccessor __parser = __ctrl; 7 __parser.AddParsedSubObject(__ctrl1); 8 HtmlHead __ctrl2 = this.__BuildControl__control3(); 9 __parser.AddParsedSubObject(__ctrl2); 10 LiteralControl __ctrl3 = this.__BuildControl__control6(); 11 __parser.AddParsedSubObject(__ctrl3); 12 HtmlForm __ctrl4 = this.__BuildControlform1(); 13 __parser.AddParsedSubObject(__ctrl4); 14 LiteralControl __ctrl5 = this.__BuildControl__control7(); 15 __parser.AddParsedSubObject(__ctrl5); 16 }
注意，这里生成的内容是根据前台页面服务器端控件生成的，也就是说前台页面中包含的内容不同，这里生成的代码也会不同。控件越多，代码也会越多。我们只分析一部分，其实后面都是一样的原理。
LiteralControl __ctrl1 = this.__BuildControl__control2();我们看这句，查看一下this.__BuildControl__control2();注意，这是前台类中的一个方法
1 [DebuggerNonUserCode] 2 private LiteralControl __BuildControl__control2() 3 { 4 LiteralControl __ctrl = new LiteralControl("\r\n\r\n<!DOCTYPE html>\r\n\r\n<html xmlns=\"http://www.w3.org/1999/xhtml\">\r\n"); 5 object[] CS$0$0001 = new object[5]; 6 CS$0$0001[0] = __ctrl; 7 CS$0$0001[2] = 0x67; 8 CS$0$0001[3] = 0x44; 9 CS$0$0001[4] = true; 10 this.__PageInspector_SetTraceData(CS$0$0001); 11 return __ctrl; 12 } 13 14
可以与前台页面的html代码对照一下
LiteralControl这个控件类就是封装字符串的，在asp.net看来，只要不是c#代码及服务端控件，都是字符串。例如后面的<input type="text" id="TextBox3" />
将这个控件对象(_ctrl)返回。继续看下一句，IParserAccessor __parser = __ctrl;注意__ctrl变量是当前的前台页面类对象，而我们可以向当前页面类对象的父类查找（），最终可以看到前台页面类继承自Control
这样就清晰多了吧。我们继续看__parser.AddParsedSubObject(__ctrl1);这是将上面的一个方法返回的字符串对象放入当前页面类对象控件集合中去，HtmlHead __ctrl2 = this.__BuildControl__control3();看这个this.__BuildControl__control3();方法，
1 [DebuggerNonUserCode] 2 private HtmlHead __BuildControl__control3() 3 { 4 HtmlHead __ctrl = new HtmlHead("head"); 5 HtmlMeta __ctrl1 = this.__BuildControl__control4(); 6 IParserAccessor __parser = __ctrl; 7 __parser.AddParsedSubObject(__ctrl1); 8 HtmlTitle __ctrl2 = this.__BuildControl__control5(); 9 __parser.AddParsedSubObject(__ctrl2); 10 object[] CS$0$0001 = new object[5]; 11 CS$0$0001[0] = __ctrl; 12 CS$0$0001[2] = 0xab; 13 CS$0$0001[3] = 0x79; 14 CS$0$0001[4] = false; 15 this.__PageInspector_SetTraceData(CS$0$0001); 16 return __ctrl; 17 } 18 19
因为前台页面html中<head runat="server">所以后台将这个看做是服务器端控件，为他生成了一个HtmlHead __ctrl = new HtmlHead("head");对象，HtmlMeta __ctrl1 = this.__BuildControl__control4();继续看this.__BuildControl__control4();
1 [DebuggerNonUserCode] 2 private HtmlMeta __BuildControl__control4() 3 { 4 HtmlMeta __ctrl = new HtmlMeta(); 5 ((IAttributeAccessor) __ctrl).SetAttribute("http-equiv", "Content-Type"); 6 __ctrl.Content = "text/html; charset=utf-8"; 7 object[] CS$0$0001 = new object[5]; 8 CS$0$0001[0] = __ctrl; 9 CS$0$0001[2] = 0xc2; 10 CS$0$0001[3] = 0x44; 11 CS$0$0001[4] = false; 12 this.__PageInspector_SetTraceData(CS$0$0001); 13 return __ctrl; 14 } 15 16
继续以结合前台html代码方式查看
这里面是循环嵌套的，难道是不难，只是有些绕。继续贴图
图没有全画出来，但意思表达出来了，就是这样，到这里整个一颗控件树就创建出来了。下面我们再返回上面说到的this.ProcessRequest(true, true);这个方法内部，进入this.ProcessRequestMain(includeStagesBeforeAsyncPoint, includeStagesAfterAsyncPoint);方法
1 private void ProcessRequestMain(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint) 2 { 3 try 4 { 5 HttpContext context = this.Context; 6 string str = null; 7 if (includeStagesBeforeAsyncPoint) 8 { 9 if (this.IsInAspCompatMode) 10 { 11 AspCompatApplicationStep.OnPageStartSessionObjects(); 12 } 13 if (this.PageAdapter != null) 14 { 15 this._requestValueCollection = this.PageAdapter.DeterminePostBackMode(); 16 if (this._requestValueCollection != null) 17 { 18 this._unvalidatedRequestValueCollection = this.PageAdapter.DeterminePostBackModeUnvalidated(); 19 } 20 } 21 else 22 { 23 this._requestValueCollection = this.DeterminePostBackMode(); 24 if (this._requestValueCollection != null) 25 { 26 this._unvalidatedRequestValueCollection = this.DeterminePostBackModeUnvalidated(); 27 } 28 } 29 string callbackControlID = string.Empty; 30 if (this.DetermineIsExportingWebPart()) 31 { 32 if (!RuntimeConfig.GetAppConfig().WebParts.EnableExport) 33 { 34 throw new InvalidOperationException(SR.GetString("WebPartExportHandler_DisabledExportHandler")); 35 } 36 str = this.Request.QueryString["webPart"]; 37 if (string.IsNullOrEmpty(str)) 38 { 39 throw new InvalidOperationException(SR.GetString("WebPartExportHandler_InvalidArgument")); 40 } 41 if (string.Equals(this.Request.QueryString["scope"], "shared", StringComparison.OrdinalIgnoreCase)) 42 { 43 this._pageFlags.Set(4); 44 } 45 string str3 = this.Request.QueryString["query"]; 46 if (str3 == null) 47 { 48 str3 = string.Empty; 49 } 50 this.Request.QueryStringText = str3; 51 context.Trace.IsEnabled = false; 52 } 53 if (this._requestValueCollection != null) 54 { 55 if (this._requestValueCollection["__VIEWSTATEENCRYPTED"] != null) 56 { 57 this.ContainsEncryptedViewState = true; 58 } 59 callbackControlID = this._requestValueCollection["__CALLBACKID"]; 60 if ((callbackControlID != null) && (this._request.HttpVerb == HttpVerb.POST)) 61 { 62 this._isCallback = true; 63 } 64 else if (!this.IsCrossPagePostBack) 65 { 66 VirtualPath path = null; 67 if (this._requestValueCollection["__PREVIOUSPAGE"] != null) 68 { 69 try 70 { 71 path = VirtualPath.CreateNonRelativeAllowNull(DecryptString(this._requestValueCollection["__PREVIOUSPAGE"], Purpose.WebForms_Page_PreviousPageID)); 72 } 73 catch 74 { 75 this._pageFlags[8] = true; 76 } 77 if ((path != null) && (path != this.Request.CurrentExecutionFilePathObject)) 78 { 79 this._pageFlags[8] = true; 80 this._previousPagePath = path; 81 } 82 } 83 } 84 } 85 if (this.MaintainScrollPositionOnPostBack) 86 { 87 this.LoadScrollPosition(); 88 } 89 if (context.TraceIsEnabled) 90 { 91 this.Trace.Write("aspx.page", "Begin PreInit"); 92 } 93 if (EtwTrace.IsTraceEnabled(5, 4)) 94 { 95 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_INIT_ENTER, this._context.WorkerRequest); 96 } 97 this.PerformPreInit(); 98 if (EtwTrace.IsTraceEnabled(5, 4)) 99 { 100 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_INIT_LEAVE, this._context.WorkerRequest); 101 } 102 if (context.TraceIsEnabled) 103 { 104 this.Trace.Write("aspx.page", "End PreInit"); 105 } 106 if (context.TraceIsEnabled) 107 { 108 this.Trace.Write("aspx.page", "Begin Init"); 109 } 110 if (EtwTrace.IsTraceEnabled(5, 4)) 111 { 112 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_INIT_ENTER, this._context.WorkerRequest); 113 } 114 this.InitRecursive(null); 115 if (EtwTrace.IsTraceEnabled(5, 4)) 116 { 117 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_INIT_LEAVE, this._context.WorkerRequest); 118 } 119 if (context.TraceIsEnabled) 120 { 121 this.Trace.Write("aspx.page", "End Init"); 122 } 123 if (context.TraceIsEnabled) 124 { 125 this.Trace.Write("aspx.page", "Begin InitComplete"); 126 } 127 this.OnInitComplete(EventArgs.Empty); 128 if (context.TraceIsEnabled) 129 { 130 this.Trace.Write("aspx.page", "End InitComplete"); 131 } 132 if (this.IsPostBack) 133 { 134 if (context.TraceIsEnabled) 135 { 136 this.Trace.Write("aspx.page", "Begin LoadState"); 137 } 138 if (EtwTrace.IsTraceEnabled(5, 4)) 139 { 140 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_VIEWSTATE_ENTER, this._context.WorkerRequest); 141 } 142 this.LoadAllState(); 143 if (EtwTrace.IsTraceEnabled(5, 4)) 144 { 145 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_VIEWSTATE_LEAVE, this._context.WorkerRequest); 146 } 147 if (context.TraceIsEnabled) 148 { 149 this.Trace.Write("aspx.page", "End LoadState"); 150 this.Trace.Write("aspx.page", "Begin ProcessPostData"); 151 } 152 if (EtwTrace.IsTraceEnabled(5, 4)) 153 { 154 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_POSTDATA_ENTER, this._context.WorkerRequest); 155 } 156 this.ProcessPostData(this._requestValueCollection, true); 157 if (EtwTrace.IsTraceEnabled(5, 4)) 158 { 159 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_POSTDATA_LEAVE, this._context.WorkerRequest); 160 } 161 if (context.TraceIsEnabled) 162 { 163 this.Trace.Write("aspx.page", "End ProcessPostData"); 164 } 165 } 166 if (context.TraceIsEnabled) 167 { 168 this.Trace.Write("aspx.page", "Begin PreLoad"); 169 } 170 this.OnPreLoad(EventArgs.Empty); 171 if (context.TraceIsEnabled) 172 { 173 this.Trace.Write("aspx.page", "End PreLoad"); 174 } 175 if (context.TraceIsEnabled) 176 { 177 this.Trace.Write("aspx.page", "Begin Load"); 178 } 179 if (EtwTrace.IsTraceEnabled(5, 4)) 180 { 181 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_ENTER, this._context.WorkerRequest); 182 } 183 this.LoadRecursive(); 184 if (EtwTrace.IsTraceEnabled(5, 4)) 185 { 186 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_LEAVE, this._context.WorkerRequest); 187 } 188 if (context.TraceIsEnabled) 189 { 190 this.Trace.Write("aspx.page", "End Load"); 191 } 192 if (this.IsPostBack) 193 { 194 if (context.TraceIsEnabled) 195 { 196 this.Trace.Write("aspx.page", "Begin ProcessPostData Second Try"); 197 } 198 this.ProcessPostData(this._leftoverPostData, false); 199 if (context.TraceIsEnabled) 200 { 201 this.Trace.Write("aspx.page", "End ProcessPostData Second Try"); 202 this.Trace.Write("aspx.page", "Begin Raise ChangedEvents"); 203 } 204 if (EtwTrace.IsTraceEnabled(5, 4)) 205 { 206 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_POST_DATA_CHANGED_ENTER, this._context.WorkerRequest); 207 } 208 this.RaiseChangedEvents(); 209 if (EtwTrace.IsTraceEnabled(5, 4)) 210 { 211 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_POST_DATA_CHANGED_LEAVE, this._context.WorkerRequest); 212 } 213 if (context.TraceIsEnabled) 214 { 215 this.Trace.Write("aspx.page", "End Raise ChangedEvents"); 216 this.Trace.Write("aspx.page", "Begin Raise PostBackEvent"); 217 } 218 if (EtwTrace.IsTraceEnabled(5, 4)) 219 { 220 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RAISE_POSTBACK_ENTER, this._context.WorkerRequest); 221 } 222 this.RaisePostBackEvent(this._requestValueCollection); 223 if (EtwTrace.IsTraceEnabled(5, 4)) 224 { 225 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RAISE_POSTBACK_LEAVE, this._context.WorkerRequest); 226 } 227 if (context.TraceIsEnabled) 228 { 229 this.Trace.Write("aspx.page", "End Raise PostBackEvent"); 230 } 231 } 232 if (context.TraceIsEnabled) 233 { 234 this.Trace.Write("aspx.page", "Begin LoadComplete"); 235 } 236 this.OnLoadComplete(EventArgs.Empty); 237 if (context.TraceIsEnabled) 238 { 239 this.Trace.Write("aspx.page", "End LoadComplete"); 240 } 241 if (this.IsPostBack && this.IsCallback) 242 { 243 this.PrepareCallback(callbackControlID); 244 } 245 else if (!this.IsCrossPagePostBack) 246 { 247 if (context.TraceIsEnabled) 248 { 249 this.Trace.Write("aspx.page", "Begin PreRender"); 250 } 251 if (EtwTrace.IsTraceEnabled(5, 4)) 252 { 253 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_RENDER_ENTER, this._context.WorkerRequest); 254 } 255 this.PreRenderRecursiveInternal(); 256 if (EtwTrace.IsTraceEnabled(5, 4)) 257 { 258 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_RENDER_LEAVE, this._context.WorkerRequest); 259 } 260 if (context.TraceIsEnabled) 261 { 262 this.Trace.Write("aspx.page", "End PreRender"); 263 } 264 } 265 } 266 if ((this._legacyAsyncInfo == null) || this._legacyAsyncInfo.CallerIsBlocking) 267 { 268 this.ExecuteRegisteredAsyncTasks(); 269 } 270 this.ValidateRawUrlIfRequired(); 271 if (includeStagesAfterAsyncPoint) 272 { 273 if (this.IsCallback) 274 { 275 this.RenderCallback(); 276 } 277 else if (!this.IsCrossPagePostBack) 278 { 279 if (context.TraceIsEnabled) 280 { 281 this.Trace.Write("aspx.page", "Begin PreRenderComplete"); 282 } 283 this.PerformPreRenderComplete(); 284 if (context.TraceIsEnabled) 285 { 286 this.Trace.Write("aspx.page", "End PreRenderComplete"); 287 } 288 if (context.TraceIsEnabled) 289 { 290 this.BuildPageProfileTree(this.EnableViewState); 291 this.Trace.Write("aspx.page", "Begin SaveState"); 292 } 293 if (EtwTrace.IsTraceEnabled(5, 4)) 294 { 295 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_SAVE_VIEWSTATE_ENTER, this._context.WorkerRequest); 296 } 297 this.SaveAllState(); 298 if (EtwTrace.IsTraceEnabled(5, 4)) 299 { 300 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_SAVE_VIEWSTATE_LEAVE, this._context.WorkerRequest); 301 } 302 if (context.TraceIsEnabled) 303 { 304 this.Trace.Write("aspx.page", "End SaveState"); 305 this.Trace.Write("aspx.page", "Begin SaveStateComplete"); 306 } 307 this.OnSaveStateComplete(EventArgs.Empty); 308 if (context.TraceIsEnabled) 309 { 310 this.Trace.Write("aspx.page", "End SaveStateComplete"); 311 this.Trace.Write("aspx.page", "Begin Render"); 312 } 313 if (EtwTrace.IsTraceEnabled(5, 4)) 314 { 315 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RENDER_ENTER, this._context.WorkerRequest); 316 } 317 if (str != null) 318 { 319 this.ExportWebPart(str); 320 } 321 else 322 { 323 this.RenderControl(this.CreateHtmlTextWriter(this.Response.Output)); 324 } 325 if (EtwTrace.IsTraceEnabled(5, 4)) 326 { 327 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RENDER_LEAVE, this._context.WorkerRequest); 328 } 329 if (context.TraceIsEnabled) 330 { 331 this.Trace.Write("aspx.page", "End Render"); 332 } 333 this.CheckRemainingAsyncTasks(false); 334 } 335 } 336 } 337 catch (ThreadAbortException exception) 338 { 339 HttpApplication.CancelModuleException exceptionState = exception.ExceptionState as HttpApplication.CancelModuleException; 340 if (((!includeStagesBeforeAsyncPoint || !includeStagesAfterAsyncPoint) || ((this._context.Handler != this) || (this._context.ApplicationInstance == null))) || ((exceptionState == null) || exceptionState.Timeout)) 341 { 342 this.CheckRemainingAsyncTasks(true); 343 throw; 344 } 345 this._context.ApplicationInstance.CompleteRequest(); 346 ThreadResetAbortWithAssert(); 347 } 348 catch (ConfigurationException) 349 { 350 throw; 351 } 352 catch (Exception exception3) 353 { 354 PerfCounters.IncrementCounter(AppPerfCounter.ERRORS_DURING_REQUEST); 355 PerfCounters.IncrementCounter(AppPerfCounter.ERRORS_TOTAL); 356 if (!this.HandleError(exception3)) 357 { 358 throw; 359 } 360 } 361 } 362 363 364 365
内容还是比较多的，但是我们着重依次看几个方法。
1.this.LoadAllState();将表单隐藏域__VIEWSTATE里的数据设置到页面对象ViewState属性
2.this.ProcessPostData(this._requestValueCollection, true);这个与第四个类似，但也有不同。将表单里提交的控件数据设置给页面对象的控件树中对应的控件。要知道这时候前台页面类对象的控件树已经构建完毕了。所以通过这个方法将表单提交的数据封装到控件树上。例如，前台页面<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>文本框中添加test字符串，点击提交的时候，我们在后台类中可以根据TextBox1.Text方式可以获取到这个文本框中的数据（test）。
3.this.LoadRecursive();调用我们在后台的Page_Load中编写的代码，此时我们可以在后台类中访问到浏览器提交的表单控件值了
4.this.ProcessPostData(this._leftoverPostData,false);为在Page_Load中添加的心控件赋值（值来自表单提交），我们可以在Page_Load方法中使用TextBox txt = new TextBox(); txt.ID = "test"; this.form1.Controls.Add(txt);同样可以讲文本框添加到前台页面中去，注意第二个方法中也是将数据封装到控件树，只是一个前后顺序的问题，也是就说在第二个方法(this.ProcessPostData(this._requestValueCollection, true);)封装控件树数据时有些在Page_Load方法中添加的控件(TextBox txt = new TextBox(); txt.ID = "test"; this.form1.Controls.Add(txt);)这时并没有在控件树中，所以数据没办法在第二个方法中封装。这时第四个方法就起作用了。
5.this.RaiseChangeEnvents();执行控件非点击回传事件，例如页面中的DropDownlist
6.this.RaisePostBackEvent(this._requsetValueCollection);执行控件点击回传事件,例如Button
7.this.SaveAllState();将控件的属性状态存入页面的ViewState中
8.this.RenderControl(this.CreatHtmlTextWriter(this.Response.Output));递归调用控件树里的每个控件的Render来生成整个页面的html代码
而在这里也可以解释为什么Page_Load中写Response.Write("测试Page_Load方法中使用Response.Write方法输出");会输出到页面<html>标签前面。因为Response.Write并不是马上输出到浏览器，而是有个缓存区，全部处理完毕，在this.RenderControl才会输出，而html一些代码在this.RenderControl中才会放入缓冲区。前后顺序的问题。
上面忘记提到为什么后台类可以访问前台页面类对象了，我们都知道子类可以访问父类的非私有成员，但是前台类才是子类，为什么父类可以访问子类的东西呢？我们反编译后台类看下
1 public class Demo : Page 2 { 3 // Fields 4 protected HtmlForm form1; 5 protected TextBox TextBox1; 6 protected HtmlInputText TextBox2; 7 8 // Methods 9 public Demo(); 10 protected void Page_Load(object sender, EventArgs e); 11 } 12 13 14 Expand Methods 15
原来后台类也声明了前台类的属性，这是在编译的时候实现的，而我们在编写的时候可以智能提示出来那就要归结vs的强大了。那就要有人问了，这里只进行了声明，并没有赋值，那我们返回看我们前台页面类构造控件树那里，查看我们前台给了服务器端控件ID属性的控件<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> 我们看这个控件被构建的过程
1 [DebuggerNonUserCode] 2 private TextBox __BuildControlTextBox1() 3 { 4 TextBox __ctrl = new TextBox(); 5 base.TextBox1 = __ctrl; 6 __ctrl.ApplyStyleSheetSkin(this); 7 __ctrl.ID = "TextBox1"; 8 object[] CS$0$0001 = new object[5]; 9 CS$0$0001[0] = __ctrl; 10 CS$0$0001[2] = 0x1ac; 11 CS$0$0001[3] = 0x38; 12 CS$0$0001[4] = false; 13 this.__PageInspector_SetTraceData(CS$0$0001); 14 return __ctrl; 15 }
是不是看到了前台类属性赋给后台类属性了呢？
这节内容有些多，又考虑到每个人生成的前台页面类可能不同，虽然内容很简单，但还是将源码上传，这样方便对照。