Session对象
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Session对象是HttpSessionState类的一个实例，其功能和Application对象类似，都是用来存储跨网页程序的变量或者对象，但Session对象和Application对象变量有些特性存在着差异。Session对象变量只针对单一网页使用者，也就是说各个连接的机器有各自的Session对象变量，不同的客户端无法互相存取。Application对象变量中止于停止IIS服务，但是Session对象变量中止于联机机器离线时，也就是当网页使用者关掉浏览器或超过设定Session变量对象的有效时间时，Session对象变量就会消失。
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新建一个网站，包括两个网页，代码如下：
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1、Default.aspx代码：
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<%@ Page Language=”C#” AutoEventWireup=”true” CodeFile=”Default.aspx.cs” Inherits=”_Default” %>
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<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
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<html xmlns=”http://www.w3.org/1999/xhtml” >
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<head runat=”server”>
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<title>无标题页</title>
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</head>
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<body>
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<form id=”form1″ runat=”server”>
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<div>
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<table style=”width: 346px; ” align=”center”>
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<tr>
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<td>
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用户名：</td>
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<td>
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<asp:TextBox ID=”TextBox1″ runat=”server”></asp:TextBox></td>
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</tr>
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<tr>
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<td>
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密码：</td>
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<td>
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<asp:TextBox ID=”TextBox2″ runat=”server” TextMode=”Password”></asp:TextBox></td>
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</tr>
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<tr>
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<td colspan=”2″ style=”text-align: center”>
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<asp:Button ID=”Button1″ runat=”server” Text=”登录” onClick=”Button1_Click” /></td>
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</tr>
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</table>
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</div>
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</form>
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</body>
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</html>
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Default.aspx.cs代码：
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using System;
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using System.Data;
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using System.Configuration;
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using System.Web;
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using System.Web.Security;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.WebControls.WebParts;
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using System.Web.UI.HtmlControls;
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using System.Data.SqlClient;
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public partial class _Default : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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}
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protected void Button1_Click(object sender, EventArgs e)
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{
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SqlConnection sqlconn = new SqlConnection(“Data Source=(local);Database=Northwind;Uid=sa;Pwd=860712″);
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sqlconn.Open();
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SqlCommand sqlcomm = sqlconn.CreateCommand();
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sqlcomm.CommandText = “select count(*) from Region where RegionID=’” + TextBox1.Text + “‘ and RegionDescription=’” + TextBox2.Text + “‘”;
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int count = Convert.ToInt32(sqlcomm.ExecuteScalar());//获取SQL语句的值强制转换成数值类型
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if (count > 0)
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{
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Session["id"] = TextBox1.Text;
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Session["name"] = TextBox2.Text;
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Page.Response.Redirect(“Default2.aspx”);
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}
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else
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{
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Response.Write(“<script language=javascript>alert(‘用户名或密码有误！’);location=’javascript：history.go(-1)’</srcript>”);
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return;
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}
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}
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}
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2、Default2.aspx代码：
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<%@ Page Language=”C#” AutoEventWireup=”true” CodeFile=”Default2.aspx.cs” Inherits=”Default2″ %>
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<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
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<html xmlns=”http://www.w3.org/1999/xhtml” >
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<head runat=”server”>
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<title>无标题页</title>
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</head>
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<body>
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<form id=”form1″ runat=”server”>
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<div>
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<asp:Label ID=”Label1″ runat=”server” Text=”Label”></asp:Label>，您是管理员。
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</div>
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</form>
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</body>
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</html>
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Default2.aspx.cs代码：
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using System;
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using System.Data;
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using System.Configuration;
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using System.Collections;
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using System.Web;
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using System.Web.Security;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.WebControls.WebParts;
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using System.Web.UI.HtmlControls;
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public partial class Default2 : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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Label1.Text = Session["name"].ToString();
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}
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}
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