asp.net中Session小例子

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登录界面aspx代码如下：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="session_login.aspx.cs" Inherits="session_login" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <link href="StyleSheet.css" rel="stylesheet" type="text/css" />
    <script type="text/javascript">
        function isempty() {
            var txt_id = document.getElementById("txt_userID");
            if (txt_id.value == "") {
                alert("请输入用户名!");
                txt_id.focus();
                return false;
                
            }
            else {return true;}
        
        }
    
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h3>登录界面</h3>
        <p class ="divTc">
            输入用户名：
            <asp:TextBox ID="txt_userID" runat="server"></asp:TextBox>
        </p>
        <p class="divTc">
            <asp:Button ID="btn_login" runat="server" Text="登录" οnclick="btn_login_Click" OnClientClick="return isempty()" />
        </p>
    </div>
    </form>
</body>
</html>

登录.aspx.cs代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class session_login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btn_login_Click(object sender, EventArgs e)
    {
        Session["uid"] = txt_userID.Text;
        Server.Transfer("session_check.aspx");
    }
}

读取.aspx代码如下：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="session_check.aspx.cs" Inherits="session_check" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <link href="StyleSheet.css" rel="stylesheet" type="text/css" />
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
       
        <asp:Button ID="Button1" runat="server" Text="退出登录" οnclick="Button1_Click" />
    </div>
    </form>
</body>
</html>

读取.aspx.cs代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class session_check : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["uid"] != null)
        {
            string _id = Session["uid"].ToString();
            Label1.Text = "欢迎登录，" + _id + "!";
        }
        else {
            Response.Redirect("session_login.aspx");
        }

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Session.Remove("uid");
        
        //跳转到本身看看
        Server.Transfer(Request.Url.LocalPath.ToString());

    }
}