如果我們能更好地掌握這樣一個過程，那麼對單個ASP.NET Page的生命周期也能更好地了解：
下面介紹如何編寫一個簡單的ASP.NET 頁面和一個簡單的HttpModule，對MSDN裡提到的ASP.NET的生命周期進行驗證
1. 首先使用Visual Studio 2010建立一個空的ASP.NET網站 （ASP.NET 4.0）
2. 添加一個Default.aspx，添加三個ASP.NET控件，分別為TextBox，Button和Validator：
復制代碼 代碼如下:
<form id="form1" runat="server">
<div>
<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
<asp:Button ID="btnSubmit" runat="server" Text="OK" onclick="btnSubmit_Click" />
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Please input your name!" ControlToValidate="txtName" ForeColor="#FF3300">
</asp:RequiredFieldValidator>
</div>
</form>
3. 添加一個ASP.NEt的App_code文件夾，新建一個類，內容為：
復制代碼 代碼如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
public class TestClass : IHttpModule
{
HttpApplication httpApp;
public static List<string> EventList = new List<string>();
public TestClass()
{
}
public void Dispose()
{ }
public void Init(HttpApplication context)
{
this.httpApp = context;
//EventList.Clear();
EventList.Add("Initiated");
context.BeginRequest += new EventHandler(context_BeginRequest);
context.AuthenticateRequest += new EventHandler(context_AuthenticateRequest);
context.AuthorizeRequest += new EventHandler(context_AuthorizeRequest);
context.ResolveRequestCache += new EventHandler(context_ResolveRequestCache);
context.AcquireRequestState += new EventHandler(context_AcquireRequestState);
context.PreRequestHandlerExecute += new EventHandler(context_PreRequestHandlerExecute);
context.PostReleaseRequestState += new EventHandler(context_PostReleaseRequestState);
context.ReleaseRequestState += new EventHandler(context_ReleaseRequestState);
context.UpdateRequestCache += new EventHandler(context_UpdateRequestCache);
context.EndRequest += new EventHandler(context_EndRequest);
}
private void context_EndRequest(object sender, EventArgs e)
{
EventList.Add("HTTP Modules: End Request <hr>");
foreach (string str in EventList)
{
httpApp.Response.Write(str + "<br>");
}
EventList.Clear();
}
void context_UpdateRequestCache(object sender, EventArgs e)
{
EventList.Add("HTTP Modules: Update Request Cache");
}
void context_ReleaseRequestState(object sender, EventArgs e)
{
EventList.Add("HTTP Modules: Release Request State");
}
void context_PostReleaseRequestState(object sender, EventArgs e)
{
EventList.Add("HTTP Modules: Post Release Request State");
}
void context_PreRequestHandlerExecute(object sender, EventArgs e)
{
EventList.Add("HTTP Modules: Pre Request Handler Execution");
}
void context_AcquireRequestState(object sender, EventArgs e)
{
EventList.Add("HTTP Modules: Acquire Request State");
}
void context_ResolveRequestCache(object sender, EventArgs e)
{
EventList.Add("HTTP Modules: Resolve Request");
}
void context_AuthorizeRequest(object sender, EventArgs e)
{
EventList.Add("HTTP Modules: Authorize Request");
}
void context_AuthenticateRequest(object sender, EventArgs e)
{
EventList.Add("HTTP Modules: AuthenticateRequest");
}
void context_BeginRequest(object sender, EventArgs e)
{
EventList.Add("HTTP Modules: Begin Request");
}
}
4. 修改剛才的Default.aspx的後台cs代碼：
復制代碼 代碼如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Init()
{
TestClass.EventList.Add("ASP.NET Page: Page_Init");
}
protected void Page_Load(object sender, EventArgs e)
{
TestClass.EventList.Add("ASP.NET Page: Page_Load");
}
public override void Validate()
{
TestClass.EventList.Add("ASP.NET Page: Validated");
base.Validate();
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
TestClass.EventList.Add("ASP.NET Page: Event");
}
protected override void Render(HtmlTextWriter writer)
{
TestClass.EventList.Add("ASP.NET Page: Render");
base.Render(writer);
}
protected void Page_Unload(object sender, EventArgs e)
{
TestClass.EventList.Add("ASP.NET Page: Unload");
}
}
5. 修改web.config內容如下：
復制代碼 代碼如下:
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.0"/>
</system.web>
<system.web>
<httpModules>
<add name="TestClass" type="TestClass"/>
</httpModules>
</system.web>
</configuration>
6. Ctrl+F5執行，在浏覽器裡可以看到：
7. 在文本框內輸入內容，可得：
結論：
1. Module只初始化了一次，當頁面postback的時候，module不會再初始化。
2. Validate和Event事件在頁面第一次初始化的時候不會觸發，但是由於頁面本身存在validate控件和事件按鈕，所以這兩個事件在第二次會被觸發。
本文參考了codeproject.com的如下一篇文章http://www.codeproject.com/KB/aspnet/ASPDOTNETPageLifecycle.aspx
