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Asp.Net文本框失去焦点检查用户名是否存在

2012-09-14 19:12 351 查看

DAL层

using System;

using System.Collections.Generic;

using System.Text;

using MODEL;

using System.Data;

namespace DAL

{

public static class UserService

{

//检查用户名是否存在

public static bool CheckUserName(string username)

{

string sql = "select count(*) from My_UserMessage where uname = '" + username + "'";

try

{

int count = DBHelper.GetScalar(sql);

if (count > 0)

{

return false;

}

else

{

return true;

}

}

catch (Exception ex)

{

Console.WriteLine(ex.Message);

return false;

}

}

}

}

BLL层

using System;

using System.Collections.Generic;

using System.Text;

using DAL;

namespace BLL

{

public static class UserManager

{

//检查用户是否存在

public static bool CheckUserName(string username)

{

return UserService.CheckUserName(username);

}

}

}

MODEL层

using System;

using System.Collections.Generic;

using System.Text;

namespace MODEL

{

public class UserMessage

{

private int id;

public int Id

{

get { return id; }

set { id = value; }

}

private string uname;

public string Uname

{

get { return uname; }

set { uname = value; }

}

private string password;

public string Password

{

get { return password; }

set { password = value; }

}

}

}

Web层

CheckUserName.aspx代码

（*注：文本框的AutoPostBack="true"的属性）

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

<!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>检查用户名是否存在</title>

</head>

<body>

<form id="form1" runat="server">

<div>

<asp:TextBox ID="txtCheck" runat="server" OnTextChanged="txtCheck_TextChanged" AutoPostBack="true"></asp:TextBox>

<asp:Label ID="lblMessage" runat="server" Text="Label"></asp:Label>

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

<asp:Button ID="Button1" runat="server" Text="Button" /></div>

</form>

</body>

</html>

CheckUserName.aspx.cs代码

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using BLL;

using MODEL;

public partial class CheckUserName : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

//文本框改变事件

protected void txtCheck_TextChanged(object sender, EventArgs e)

{

bool result = UserManager.CheckUserName(txtCheck.Text.Trim());

if (result == true)

{

lblMessage.Text = "恭喜您，此用户名可以使用！";

Button1.Enabled = true;

}

if (result == false)

{

lblMessage.Text = "该用户名已存在，请更换用户名！";

Button1.Enabled = false;

}

}

}

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