ASP.NET的Postback

2019-06-20 08:48:35来源：阅读 ()

我们知道，无论是ASP.NET1.x,;2.0，甚至是以后的版本，ASP.NET最终Render到Client端通过浏览器浏览的都是一样：一个单纯的HTML。Client通过;Submit;Form的方式将填入Form的数据提交给Server进行处理。我们现在来看看ASP.NET整个Postback程序处理的过程。;

首先我们通过一个Sample来看ASP.NET如何处理一个通过Click一个Button引起的Postback。下面是Web;Page的HTML：

<%@;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>Test;Page</title>
</head>
<body>
<form;id="form1";runat="server">
<div>
<asp:Label;runat="server";ID="LabelMessage";ForeColor="red"></asp:Label>
</div>
<div>
<asp:Button;runat="server";ID="Button1";Text="Button1";OnClick="Button1_Click";OnCommand="Button_Command";;;;;CommandArgument="Button1";/>
<asp:Button;runat="server";ID="Button2";Text="Button2";OnClick="Button2_Click";OnCommand="Button_Command";;;;CommandArgument="Button2";UseSubmitBehavior="false";/>
<asp:Button;runat="server";ID="Button3";Text="Button3";OnClick="Button3_Click";OnCommand="Button_Command";;;;CommandArgument="Button3";UseSubmitBehavior="false";/>
</div>
</form>
</body>
</html>

很简单，定义了3个Button，分别注册了他们的两个Event：Click和Command。3个Button的Command;Event;Hander是一样的：Button_Command，通过指定的CommandArgument来让Event;Handler判断到底是哪个Button触发了Command;Event。;

下面是Code;Behind：

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)
{
}
protected;void;Button1_Click(object;sender,;EventArgs;e)
{
string;message;=;string.Format("The;{0};event;of;{1};is;fired",;"Click",;"Button1");
this.LabelMessage.Text;=;message;
}
protected;void;Button2_Click(object;sender,;EventArgs;e)
{
string;message;=;string.Format("The;{0};event;of;{1};is;fired",;"Click",;"Button2");
this.LabelMessage.Text;=;message;
}
protected;void;Button3_Click(object;sender,;EventArgs;e)
{
string;message;=;string.Format("The;{0};event;of;{1};is;fired",;"Click",;"Button3");
this.LabelMessage.Text;=;message;
}
protected;void;Button_Command(object;sender,;CommandEventArgs;e)
{
string;message;=;string.Format("The;{0};event;of;{1};is;fired",;"Command",;e.CommandArgument);
this.LabelMessage.Text;+=;";;";+;message;
}
}

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