asp.net 统计登录的用户数
操作题1 设计包含一个包含Login.aspx和Welcome.aspx两个页面的网站。要求用户登录界面如下图，输入制定的用户名和密码后才能打开Welcome.aspx页面，此时页面中显示用户名、欢迎信息以及是第几位登录用户。
方法一：使用image控件来显示图片：
1.Login.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Login : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Session["username"] = "mr";
Session["password"] = "mrsoft";
Application["count"] = 0;
}
protected void Button1_Click1(object sender, EventArgs e)
{
//Session["flag"] = "true";
//接收来自文本框的用户名和密码
String name = TextBox1.Text;
String pw = TextBox2.Text;
if (name == "mr" && pw == "mrsoft")
{
Response.Redirect("Welcome.aspx");
}
else
{
Response.Write("<script>alert('用户名或密码有误');</script>");
}
}
protected void Button2_Click(object sender, EventArgs e)
{
TextBox1.Text = "";
TextBox2.Text = "";
}
}
2.Welcome.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Welcome : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Application["count"] = Convert.ToInt32(Application["count"]) + 1;
<span style="white-space:pre"> int s=Convert.ToInt32(Application["count"]);</span>
switch (s)
{
case 1:
Image1.ImageUrl = "~/picture/1.jpg";
Image2.Visible = false;//隐藏第二张图片
break;
case 2:
Image1.ImageUrl = "~/picture/2.jpg";
Image2.Visible = false;
break;
case 3:
Image1.ImageUrl = "~/picture/3.jpg";
Image2.Visible = false;
break;
case 4:
Image1.ImageUrl = "~/picture/4.jpg";
Image2.Visible = false;
break;
case 5:
Image1.ImageUrl = "~/picture/5.jpg";
Image2.Visible = false;
break;
case 6:
Image1.ImageUrl = "~/picture/6.jpg";
Image2.Visible = false;
break;
case 7:
Image1.ImageUrl = "~/picture/7.jpg";
Image2.Visible = false;
break;
case 8:
Image1.ImageUrl = "~/picture/8.jpg";
Image2.Visible = false;
break;
case 9:
Image1.ImageUrl = "~/picture/9.jpg";
Image2.Visible = false;
break;
case 10:
Image1.ImageUrl = "~/picture/1.jpg";
Image2.ImageUrl = "~/picture/0.jpg";
break;
}
}
}
3.Login.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Login.aspx.cs" Inherits="Login" %>
<!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></title>
</head>
<body>
<form id="form1" runat="server">
<div style="color: #008000">
用户登录<br />
用户名：<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>(<%=Session["username"]%>)
<br />
密码：
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>(<%=Session["password"]%>)
<br />
<asp:Button ID="Button1" runat="server" Text="登录" OnClick="Button1_Click1" />
<asp:Button ID="Button2" runat="server" Text="取消" OnClick="Button2_Click" />
</div>
</form>
</body>
</html>
4.Welcome.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Welcome.aspx.cs" Inherits="Welcome" %>
<!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></title>
</head>
<body>
<form id="form1" runat="server">
<div>
欢迎用户<%=Session["username"]%>登录本系统<br/>
您是本网站第<asp:Image ID="Image1" runat="server" />位登录的用户</div>
</form>
</body>
</html>
方法二：使用代码显示图片
在Welcome.aspx.cs中加入如下的方法，并在前台页面调用。
public void showPic (){
String s = Convert.ToString(Application["count"]);
String img = " ";
for (int i = 0; i < s.Length; i++) {
img += "<img src='"+"picture/"+s[i]+".jpg'>";
}
Response.Write(img);
} 调用方式
<%showPic();%>
注意：本实验中使用application创建的变量模拟用户登录，注意image属性的应用，注意显示图片的方法。