Aspx页面的相关流程和事件
参考资料：
Msdn:
HTTP Handlers and HTTP Modules Overview:
ms-help://MS.MSDNQTR.v90.en/dv_vwdcon/html/f540bdeb-d22e-4e1d-ba8a-fe6c9926283b.htm
ASP.NET Application Life Cycle Overview for IIS 7.0
ms-help://MS.MSDNQTR.v90.en/dv_vwdcon/html/be3378e2-7071-48d4-9d6f-1b31d73bc7aa.htm
http://www.cnblogs.com/jintianhu/archive/2010/12/10/1902078.html
.NET (C#) Internals: ASP.NET 应用程序与页面生命周期（意译）
http://www.cnblogs.com/skynet/archive/2010/04/29/1724020.html
Community Server专题四：HttpHandler:
http://www.cnblogs.com/ugoer/archive/2005/09/07/231676.html
Aspx页面继承了：Page
Page类的信息：public class Page : TemplateControl, IHttpHandler
interface IHttpHandler
{
void ProcessRequest(HttpContext ctx);
bool IsReuseable { get; }
}
接口中ProcessRequest是添加自己的代码进行相应处理的地方。IsReuseable属性指明该HttpHandler的实现类是否需要缓存。
说明：1，Page类是一个httphandler,那么肯定实现了ProcessRequest方法；该方法将处理对aspx页面的请求
2，继承了TemplateControl,从名字可以看出该类的作用是模板，反编译查看源码发现了如下常用方法的字符串形式
private const string _onTransactionAbortEventName = "OnTransactionAbort";
private const string _onTransactionCommitEventName = "OnTransactionCommit";
private const string _pageAbortTransactionEventName = "Page_AbortTransaction";
private const string _pageCommitTransactionEventName = "Page_CommitTransaction";
private const string _pageDataBindEventName = "Page_DataBind";
private const string _pageErrorEventName = "Page_Error";
private const string _pageInitCompleteEventName = "Page_InitComplete";
private const string _pageInitEventName = "Page_Init";
private const string _pageLoadCompleteEventName = "Page_LoadComplete";
private const string _pageLoadEventName = "Page_Load";
private const string _pagePreInitEventName = "Page_PreInit";
private const string _pagePreLoadEventName = "Page_PreLoad";
private const string _pagePreRenderCompleteEventName = "Page_PreRenderComplete";
private const string _pagePreRenderEventName = "Page_PreRender";
private const string _pageSaveStateCompleteEventName = "Page_SaveStateComplete";
private const string _pageUnloadEventName = "Page_Unload";
从这些字符串中可以猜测aspx页面的常用事件的执行和这个类有一点的关系
Machine.Config :
Httphandler配置节
<add verb="*" path="*.aspx" type="System.Web.UI.PageHandlerFactory"/>
反编译查看源码：
PageHandlerFactory的GetHandler初始化实现了IHttpHandler的页面，继承了Page的页面都是满足该要求
private IHttpHandler GetHandlerHelper(HttpContext context, string requestType, VirtualPath virtualPath, string physicalPath)
{
Page page = BuildManager.CreateInstanceFromVirtualPath(virtualPath, typeof(Page), context, true, true) as Page;
if (page == null)
{
return null;
}
page.TemplateControlVirtualPath = virtualPath;
return page;
}
Page类中有关ProcessRequest的方法
public virtual void ProcessRequest(HttpContext context)——》private void ProcessRequestWithNoAssert(HttpContext context)——》
private void ProcessRequest()——》private void ProcessRequest(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint)
——》private void ProcessRequestMain(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint)（在该方法中可以看到页面生命周期的相关事件的执行）