Application對象
Application對象是HttpApplicationState類的一個實例，它可以產生一個所有Web應用程序都可以存取的變量，這個變量的可以存取範圍涵蓋全部使用者，也就是說只要正在使用這個網頁的程序都可以存取這個變量。
新建一個網站，包括兩個網頁，代碼如下：
1、Index.aspx代碼：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Index.aspx.cs" Inherits="Index" %>
<!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>無標題頁</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table style="width: 300px; height: 100px">
<tr>
<td style="width: 100px">
用戶名：</td>
<td style="width: 246px">
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox></td>
</tr>
<tr>
<td style="width: 100px">
密 碼：</td>
<td style="width: 246px">
<asp:TextBox ID="TextBox2" runat="server" TextMode="Password"></asp:TextBox></td>
</tr>
<tr>
<td style="text-align: center;" colspan="2">
<asp:Button ID="Button1" runat="server" Text="登錄" OnClick="Button1_Click" /></td>
</tr>
</table>
</div>
</form>
</body>
</html>
Index.aspx.cs代碼：
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;
public partial class Index : System.Web.UI.Page
{
string strInfo;
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
Application["Info"] = TextBox1.Text;
strInfo = Application["Info"].ToString();
if (TextBox1.Text == "admin" && TextBox2.Text == "admin")
{
Session["name"] = TextBox1.Text;
Response.Redirect("Default.aspx?Info=" + strInfo + "");//地址欄的傳值
}
}
}
2、Default.aspx代碼：
<%@ 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>無標題頁</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table style="width: 500px; height: 323px">
<tr>
<td colspan="2">
<asp:TextBox ID="TextBox2" runat="server" Height="314px" Width="497px" TextMode="MultiLine"></asp:TextBox></td>
</tr>
<tr>
<td>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server" Width="390px"></asp:TextBox></td>
<td>
<asp:Button ID="Button2" runat="server" Text="發送" OnClick="Button2_Click" /></td>
</tr>
</table>
</div>
</form>
</body>
</html>
Default.aspx.cs代碼：
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)
{
Label1.Text = Session["name"].ToString();
/*對象的增加
Application.Add("App1", "Value1");
Application.Add("App2", "Value2");
Application.Add("App3", "Value3");
Response.Write("Application對象的使用");
Response.Write("<br>");
for (int i = 0; i < Application.Count; i++)
{
Response.Write("變量名：" + Application.GetKey(i));
Response.Write(",值：" + Application[i] + "<p>");
Response.Write("<br>");
}*/
}
protected void Button2_Click(object sender, EventArgs e)
{
Application["content"] = TextBox1.Text;
TextBox2.Text = TextBox2.Text + "/n" + Label1.Text + "說：" + Application["content"].ToString();
}
}