Ajax+asp.net实现用户登陆

以用户登录为例练习ajax的使用方法

login.html





  
  


  

    

      
登录
    
    

      
用户名：
      

    
    

      
密码：
      

    
    

      

 
      
      

 
      
      

    
  

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" %>
 

 



  


  

以上所述就是本文的全部内容了，希望大家能够喜欢。