ASP.NET 内置对象
1. Response 对象
Response对象是HttpResponse类的一个实例, 它用于控制服务器发送给浏览器的信息, 包括直接发送信息给浏览器, 重定向浏览器到另一个URL或设置cookie的值.
①. 发送信息
Response.Write(value);
②. 重定向浏览器
Response.Redirect(Url);
2. Request 对象
Request对象是HttpRequest类的一个实例, 其主要功能是从客户端获取数据.
①. 获取URL传递变量
Request对象的QueryString属性可以用来获取URL地址中"?"后面的数据, 即URL附加信息.
QueryString主要用于获取HTTP协议中GET请求发送的数据. Get方式是HTTP请求中默认的请求方式.
Request ：
< head runat = " server " >
< title > 使用Request对象 </ title >
</ head >
< body >
< center >
< form id = " form1 " runat = " server " action = " incept.aspx " method = " get " >
请输入你的姓名 < input type = " text " name = " name " />< p ></ p >
< input type = " submit " value = " 发送 " />
</ form >
</ center >
</ body >
</ html >
incept：
< head runat = " server " >
< title > 使用Request对象 </ title >
</ head >
< body >
< center >
< form id = " form1 " runat = " server " >
< h4 > 接受Get方法传递来的数据 < br /></ h4 >
<%
string name = Request.QueryString[ " name " ];
Response.Write( " 你的姓名为 " + name);
%>
</ form >
</ center >
</ body >
</ html >
②. 获取表单传递值
当需要在网页间传递信息时, 还可以通过表单来实现, 表单传递的信息可以由Request对象的Form属性来获取.
Request
< head runat = " server " >
< title > 使用Request对象 </ title >
</ head >
< body >
< form id = " form1 " runat = " server " action = " formadd.aspx " method = " post " >
请输入你的姓名: < input type = " text " name = " name " />< br />
请输入你的性别: < input type = " text " name = " sex " />< br />
请输入你的职业: < input type = " text " name = " occupation " />< br />
< input type = " submit " value = " 发送 " id = " submit1 " name = " submit1 " />
</ form >
</ body >
</ html >
Form：
< head runat = " server " >
< title > 使用Request对象2 </ title >
</ head >
< body >
< center >
< form id = " form2 " runat = " server " >
< h4 > 接受POST方法所传的数据 < br /></ h4 >
<%
string name = Request.Form[ " name " ];
Response.Write( " 你的姓名为: " + name + " <br> " );
string sex = Request.Form[ " sex " ];
Response.Write( " 你的性别为: " + sex + " <br> " );
string occupation = Request.Form[ " occupation " ];
Response.Write( " 你的职业为: " + occupation + " <br> " );
%>
</ form >
</ center >
</ body >
</ html >
3. Server对象
Server对象提供了对服务器上方法和属性的访问.
Server对象的大多数方法和属性是作为实用程序的功能服务的, 例如, 使用它们可以实现转变字符串格式, 创建捆绑对象以及控制页面显示时间等.
①. 向浏览器输出HTML代码
使用Server对象的HTMLEncode方法可以向浏览器输出HTML代码.
HTMLCode：
< head runat = " server " >
< title > 使用Server对象 </ title >
</ head >
< body >
< form id = " form1 " runat = " server " >
<%
Response.Write(Server.HtmlEncode( " <center><h4>成功属于,永不放弃的人!<br></h4></center> " ));
Response.Write( " <center><h4>成功属于,永不放弃的人!<br></h4></center> " );
%>
</ form >
</ body >
</ html >
4. Application对象
Application对象是运行在Web应用服务器上的虚拟目录及其子目录下所有文件,页面,模块和可执行代码的总和.
①. 使用Application对象的自定义属性
可以根据特定的需要为Application对象定义属性, 以存储一些公有的数据, 语法:
Application["属性名"]
示例:
Application
< head runat = " server " >
< title > 使用Application对象 </ title >
</ head >
< body >
< center >
< form id = " form1 " runat = " server " >
<%
Application[ " regardMorning " ] = " 上午好! " ;
Application[ " regardAfernoon " ] = " 下午好! " ;
Application[ " regardNight " ] = " 晚上好! " ;
%>
<%= Application[ " regardMorning " ] %>< br />< p ></ p >
<%= Application[ " regardAfernoon " ] %>< br />< p ></ p >
<% = Application[ " regardNight " ] %>
</ form >
</ center >
</ body >
</ html >
②. 网页计数器
网页计数器是Application对象的功能之一, 由于Application对象是所有用户共享的, 因而可以用来存储计数器的值, 当有新用户访问网页时, 可以自动增加计数器的值.
Count
< head runat = " server " >
< title > 使用Application对象 </ title >
</ head >
< body >
< form id = " form1 " runat = " server " >
<%
Application.Lock();
Application[ " count " ] = Convert.ToInt32(Application[ " count " ]) + 1 ;
Application.UnLock();
%>
< p align = " center " > 您是本网站第 <%= Application[ " count " ] %> 位贵宾 !</ p >
</ form >
</ body >
</ html >
5. Session对象
从一个客户到达某个网站开始, 到其离开该网页为止的这段时间内, 服务器会为该用户分配一个Session, 以保存该用户会话时所需要的信息.
①. 利用Session的自定义属性保存信息
Session对象的主要用途是保存信息. 当一个客户第一次登录网站时,系统会为其分配一个Session, 只有当该客户退出时,或Session的生命周期结束时, 信息才会被清除.
②. Session的唯一性和Session的终止
当客户登录网站后, 服务器会为其分配一个Session, 不同客户的Session是各不相同的, 用以标识不同的客户, SessionID属性是用以区别Session的唯一标志, 每个Session都具有唯一的SessionID.
③. 利用Session实现购物车
利用Session还可以创建虚拟购物车, 当客户在网络商店中选择商品时, 该商品就会进入购物车里面, 客户的购物信息就保存在Session中.
Session的一个重要应用就是实现电子商务网站的购物车.
模拟购物车实例:
购买商品
Product
< head runat = " server " >
< title > 使用Session对象 </ title >
</ head >
< body >
<%
if (Request[ " b1 " ] == " 提交 " )
{
Session[ " s1 " ] = Request[ " c1 " ];
Session[ " s2 " ] = Request[ " c2 " ];
Session[ " s3 " ] = Request[ " c3 " ];
}
%>
各种彩电大减价,欢迎选购 !
< form id = " form1 " runat = " server " method = " post " action = " Product.aspx " >
< p >< input type = " checkbox " name = " c1 " value = " 海尔彩电 " /> 海尔彩电 </ p >
< p >< input type = " checkbox " name = " c2 " value = " 长虹彩电 " /> 长虹彩电 </ p >
< p >< input type = " checkbox " name = " c3 " value = " 康佳彩电 " /> 康佳彩电 </ p >
< p >< input type = " submit " name = " b1 " value = " 提交 " />
< input type = " reset " name = " b2 " value = " 全部重写 " />
< a href = " otherProduct.aspx " > 买其他商品 </ a >
< a href = " myCart.aspx " > 查看购物车 </ a >
</ p >
</ form >
</ body >
</ html >
购买其他商品:
otherProduct
< head runat = " server " >
< title > 使用Session对象 </ title >
</ head >
< body >
<%
if (Request[ " x1 " ] == " 提交 " )
{
Session[ " s4 " ] = Request[ " b1 " ];
Session[ " s5 " ] = Request[ " b2 " ];
Session[ " s6 " ] = Request[ " b3 " ];
}
%>
各种鞋子大减价,欢迎选购 !
< form id = " form1 " runat = " server " method = " post " action = " otherProduct.aspx " >
< p >< input type = " checkbox " name = " b1 " value = " 旅游鞋 " /> 旅游鞋 </ p >
< p >< input type = " checkbox " name = " b2 " value = " 跑鞋 " /> 跑鞋 </ p >
< p >< input type = " checkbox " name = " b3 " value = " 冰鞋 " /> 冰鞋 </ p >
< p >< input type = " submit " name = " x1 " value = " 提交 " />
< input type = " reset " name = " b2 " value = " 全部重写 " />
< a href = " Product.aspx " > 买其他商品 </ a >
< a href = " myCart.aspx " > 查看购物车 </ a >
</ p >
</ form >
</ body >
</ html >
查看购物车：
Cart
< head runat = " server " >
< title > 使用Session对象 </ title >
</ head >
< body >
购物情况显示:
< div align = " center " >
<%
Response.Write(Session[ " s1 " ] + " <br> " );
Response.Write(Session[ " s2 " ] + " <br> " );
Response.Write(Session[ " s3 " ] + " <br> " );
Response.Write(Session[ " s4 " ] + " <br> " );
Response.Write(Session[ " s5 " ] + " <br> " );
Response.Write(Session[ " s6 " ] + " <br> " );
%>
</ div >
</ body >
</ html >
6. Cookie对象
在HTTP协议下, Cookie只不过是一个文本文件, 是服务器或者脚本用以维护用户信息的一种方式, Cookie可以用来记录用户的相关信息.
向浏览器输出Cookie, 也就是将Cookie写入到浏览器中, 让浏览器保存Cookie的值.
Cookie
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class Cookie : System.Web.UI.Page
{
protected void Page_Load( object sender, EventArgs e)
{
HttpCookie myCookie = new HttpCookie( " user " );
myCookie.Value = " You are really wonderful! " ;
Response.Cookies.Add(myCookie);
Response.Write( " <center> " + " 写入Cookie " + " </center> " );
string aCookie = Request.Cookies[ " user " ].Value;
Response.Write( " <center> " + aCookie + " </center> " );
Response.Write( " <br> " );
}
}
文章转自：http://www.cnblogs.com/huakai/archive/2009/09/29/1575467.html