如果我們能更好地掌握這樣一個(gè)過程,那么對單個(gè)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(gè)簡單的ASP.NET 頁面和一個(gè)簡單的HttpModule,對MSDN里提到的ASP.NET的生命周期進(jìn)行驗(yàn)證
1. 首先使用Visual Studio 2010建立一個(gè)空的ASP.NET網(wǎng)站 (ASP.NET 4.0)
2. 添加一個(gè)Default.aspx,添加三個(gè)ASP.NET控件,分別為TextBox,Button和Validator:
復(fù)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(gè)ASP.NEt的App_code文件夾,新建一個(gè)類,內(nèi)容為:
復(fù)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 Liststring> EventList = new Liststring>();
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的后臺(tái)cs代碼:
復(fù)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(nèi)容如下:
復(fù)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(zhí)行,在瀏覽器里可以看到:
7. 在文本框內(nèi)輸入內(nèi)容,可得:
結(jié)論:
1. Module只初始化了一次,當(dāng)頁面postback的時(shí)候,module不會(huì)再初始化。
2. Validate和Event事件在頁面第一次初始化的時(shí)候不會(huì)觸發(fā),但是由于頁面本身存在validate控件和事件按鈕,所以這兩個(gè)事件在第二次會(huì)被觸發(fā)。
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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