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 程式師世界 >> 編程語言 >> .NET網頁編程 >> ASP.NET >> ASP.NET基礎 >> 驗證一個ASP.NET應用程序和頁面的生命周期的實現代碼

驗證一個ASP.NET應用程序和頁面的生命周期的實現代碼

編輯:ASP.NET基礎
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

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