Ajax+asp.net实现用户登陆

以用户登录为例练习ajax的使用方法

<！DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><title></title><script type="text/javascript">var obj = createobj（）; function login（name, pwd）{var urlstr = "http://localhost:14248/server.aspx?username=" + name + "&password=" + pwd;obj.open（"get", urlstr, true）;obj.onreadystatechange = dowork;obj.send（）;} function dowork（）{if （obj.readyState == 4）{if （obj.status == 200）{document.getElementById（"msg"）.innerText = obj.responseText;}}}//创建对象function createobj（）{var xmlHttp = null;try {//非IE浏览器xmlHttp = new XMLHttpRequest（）;}catch （e）{//IE浏览器try{xmlHttp = new ActiveXObject（"Msxml2.HTTP"）;}catch （e）{xmlHttp = new ActiveXObject（"Microsoft.XMLHTTP"）;}}return xmlHttp;}</script></head><body><table><tr><td align="center" colspan="2">登录</td></tr><tr><td>用户名：</td><td><input type="text" id="username" name="username" /></td></tr><tr><td>密码：</td><td><input type="password" id="password" name="password" /></td></tr><tr><td ><input type="submit" value="登录" onclick="login（document.getElementById（"username"）.value,document.getElementById（"password"）.value）" /></td><td><input type="reset" value="清空" /></td><td><span id="msg"></span></td></tr></table></body></html>

DAL.cs

using System;using System.Collections.Generic;using System.Data;using System.Data.SqlClient;using System.Linq;using System.Web; namespace AJAXtest{public class DAL{private string connstr = "server=acer-pc;database=mydatabase;user id=sa;password=123456";public DataTable selectDB（string sql）{DataTable dt = new DataTable（）;try{SqlConnection conn = new SqlConnection（connstr）;SqlDataAdapter sda = new SqlDataAdapter（sql, conn）;sda.Fill（dt）;}catch（Exception e）{}return dt;}}}

BLL.cs

using System;using System.Collections.Generic;using System.Data;using System.Linq;using System.Web; namespace AJAXtest{public class BLL{public bool login（string username,string password）{try{string sql = "select password from Users where username="" + username + """;DAL sqlSelect = new DAL（）;DataTable dt = sqlSelect.selectDB（sql）;if （dt.Rows[0]["password"].ToString（） ！= password）return false;}catch （Exception）{ }return true;}}}

Server.aspx.cs

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls; namespace AJAXtest{public partial class Server : System.Web.UI.Page{protected void Page_Load（object sender, EventArgs e）{string username = Request["username"].ToString（）;string password = Request["password"].ToString（）;BLL b = new BLL（）;if （b.login（username, password））{Response.Write（"登录成功"）;Response.End（）;}else{Response.Write（"登录失败"）;Response.End（）;}}}}

Server.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Server.aspx.cs" Inherits="AJAXtest.Server" %> <！DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><title></title></head><body><form id="form1" runat="server"><div> </div></form></body></html>

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