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2022-07-15 80酷酷网 80kuku.com

Page_Load事件---IsPostBack属性

aspx代码

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

<!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>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div left">
        <br />
        <br />
        <br />
        <br />

        <asp:Label ID="Label1" runat="server" Height="31px" Text="用户名：" Width="95px"></asp:Label>
        <asp:TextBox ID="textUserName" runat="server" Height="24px" OnTextChanged="textUserName_TextChanged">textUserName</asp:TextBox><br />
        <asp:Label ID="Label2" runat="server" Height="29px" Text="密码："
            Width="93px"></asp:Label>
        <asp:TextBox ID="textUserPwd" runat="server" Height="22px">textUserPwd</asp:TextBox>
        <br />
        <br />

        <asp:Button ID="btnLogin" runat="server" Text="登录" />

        <asp:Button ID="btnClear" runat="server" Text="清空" />

        <asp:Button ID="btnClose" runat="server" Text="关闭" /><br />
        <br />

        <asp:Label ID="lblMessage" runat="server" Height="66px" Text=" " Width="175px"></asp:Label></div>
    </form>
</body>
</html>

aspx.cs代码

using System;
using System.Data;
using System.Configuration;
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;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack) //判断页面是否是第一次加载
        {
            this.textUserName.Text= " "; //将用户名框设置为空
            this.textUserPwd.Text= " "; //将密码框设置为空
        }
        this.btnClose.Attributes.Add("onclick", "window.close();");//关闭按纽设置，相当于在aspx文件的asp:label中添加
    }

    protected void btnLogin_Click(object sender, EventArgs e)
    {
        if (this.textUserName.Text == "zuo" && this.textUserPwd.Text == "zuo")
        {
            this.lblMessage.Text = "登录成功";
        }
        else
        {
            this.lblMessage.Text = "登陆失败";
        }
    }
    protected void btnClear_Click(object sender, EventArgs e)
    {
        this.textUserName.Text = " ";　　//设置为空
        this.textUserPwd.Text = " ";　　//设置为空
    }
}