ASP.NET AJAX：Ajax验证(ajax+Handler处理)

1，提交页面

<%@ Page Language="C#" %>

<!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>
    <script type="text/javascript" src="js/jquery.js"></script>
    <script type="text/javascript">
        function checkUser() {
            var username = $("#username").val();
            var password = $("#password").val();
            if (username == "") {
                alert("请输入用户名！");
                return false;
            }
            else if (password == "") {
                alert("请输入密码！");
                return false;
            }
            var data = {
                username: encodeURIComponent(username),
                userpass:encodeURIComponent(password)
            }
            $.post("Handler.ashx", data, function (msg) {
                if (msg == "1") {
                   // return true;
                }
                else {
                    alert("用户名或密码有误！");
                    return false;
                }
            });
        }
    </script>
</head>
<body>
<h2>Ajax用户登录</h2>

用户名：<input id="username" name="username" type="text" /><br />
密&nbsp;码：<input id="password" name="password" type="password" /><br />
<input onclick="checkUser()" type="button" value="登录" />

</body>
</html>

2，处理页面1

Handler.ashx

<%@ WebHandler Language="C#" Class="Handler" %>

using System;
using System.Web;

public class Handler : IHttpHandler {
    
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";

        string username = context.Request["username"];
        string password = context.Request["password"];

        string flag="0";
        if (username == "sunshine" && password == "m123")
        {
            flag = "1";
        }
            
        context.Response.Write(flag);
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }

}

3，处理页面2

SignInData.aspx.sc

using System;

public partial class SignInData : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {       
        CheckUser();
        Response.End();

    }
    /// <summary>
    /// 验证用户
    /// </summary>
    private void CheckUser()
    {
        string username = Request["username"];
        string password = Request["password"];

        if (username == "sunshine" && password == "m123")
        {
            Response.Write("1");
        }
        else
        {
            Response.Write("0");
        }
    }
}