Ajax+asp.net实现用户登陆_实用技巧_





  
  


  

    

      
登录
    
    

      
用户名：
      

    
    

      
密码：
      

    
    

      

        
      
      

        
      
      

    
  

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;
    }
  }
}

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;
    }
  }
}

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();
      }
    }
  }
}

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Server.aspx.cs" Inherits="AJAXtest.Server" %>