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解析Asp.Net頁(yè)面執(zhí)行流程(2)_.Net教程

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一直以來(lái)存在這么一個(gè)問(wèn)題,就是當(dāng)用戶上傳的Flash文件時(shí)都需要附帶輸入Flash的寬和高,否則顯示的時(shí)候由于不知道這些數(shù)值而導(dǎo)致Flash比例不正常。 近日我做網(wǎng)站也涉及到了這方面的問(wèn)題

正如2.2中所提到的,這里主要是生成一個(gè)HttpApplication對(duì)象:

以下為引用的內(nèi)容:

internal static string GetApplicationFile()
{
return Path.Combine(HttpRuntime.AppDomainAppPathInternal,

"global.asax");
}

首先會(huì)查看是否存在global.asax文件,如果有的話就用它來(lái)生成HttpApplication對(duì)象,從這里我們可以看到global.asax的文件名是在asp.net的框架中寫(xiě)死的,不能修改的。如果這個(gè)文件不存在就使用默認(rèn)的對(duì)象。
創(chuàng)建好HttpApplication之后對(duì)它進(jìn)行初始化:

以下為引用的內(nèi)容:

application = (HttpApplication)

HttpRuntime.CreateNonPublicInstance(this._theApplicationType);
using (ApplicationImpersonationContext context2 = new


ApplicationImpersonationContext())
{
application.InitInternal(context, this._state,


this._eventHandlerMethods);
}

四、HttpApplication這個(gè)是比較復(fù)雜也比較重要的一個(gè)對(duì)象首先是執(zhí)行初始化操作,比較重要的一步就是進(jìn)行HttpModule的初始化:

以下為引用的內(nèi)容:

private void InitModules()
{
this._moduleCollection =

RuntimeConfig.GetAppConfig().HttpModules.CreateModules();
this.InitModulesCommon();
}它會(huì)讀取web.config中所有HttpModule的配置
在HookupEventHandlersForApplicationAndModules方法中綁定Module的事件處理

程序接著進(jìn)行事件實(shí)際綁定:

以下為引用的內(nèi)容:

if (HttpRuntime.UseIntegratedPipeline)
{
this._stepManager = new PipelineStepManager(this);
}
else
{
this._stepManager = new ApplicationStepManager(this);
}
this._stepManager.BuildSteps(this._resumeStepsWaitCallback);
在ApplicationStepManager的BuildSteps方法中可以看到事件的綁定執(zhí)行順序:

app.CreateEventExecutionSteps(HttpApplication.EventBeginRequest,

steps);
app.CreateEventExecutionSteps(HttpApplication.EventAuthenticateRequest,

steps);


app.CreateEventExecutionSteps(HttpApplication.EventDefaultAuthenticatio

n, steps);


app.CreateEventExecutionSteps(HttpApplication.EventPostAuthenticateRequ

est, steps);
app.CreateEventExecutionSteps(HttpApplication.EventAuthorizeRequest,

steps);


app.CreateEventExecutionSteps(HttpApplication.EventPostAuthorizeRequest

, steps);


app.CreateEventExecutionSteps(HttpApplication.EventResolveRequestCache,

steps);


app.CreateEventExecutionSteps(HttpApplication.EventPostResolveRequestCa

che, steps);
steps.Add(new HttpApplication.MapHandlerExecutionStep(app));


app.CreateEventExecutionSteps(HttpApplication.EventPostMapRequestHandle

r, steps);


app.CreateEventExecutionSteps(HttpApplication.EventAcquireRequestState,

steps);


app.CreateEventExecutionSteps(HttpApplication.EventPostAcquireRequestSt

ate, steps);


app.CreateEventExecutionSteps(HttpApplication.EventPreRequestHandlerExe

cute, steps);
steps.Add(new HttpApplication.CallHandlerExecutionStep(app));


app.CreateEventExecutionSteps(HttpApplication.EventPostRequestHandlerEx

ecute, steps);


app.CreateEventExecutionSteps(HttpApplication.EventReleaseRequestState,

steps);


app.CreateEventExecutionSteps(HttpApplication.EventPostReleaseRequestSt

ate, steps);
steps.Add(new HttpApplication.CallFilterExecutionStep(app));
app.CreateEventExecutionSteps(HttpApplication.EventUpdateRequestCache,

steps);


app.CreateEventExecutionSteps(HttpApplication.EventPostUpdateRequestCac

he, steps);
this._endRequestStepIndex = steps.Count;
app.CreateEventExecutionSteps(HttpApplication.EventEndRequest, steps);
steps.Add(new HttpApplication.NoopExecutionStep());

原文地址:http://bbs.mb5u.com/Design/thread-1167995-1-1.html

分享:解析VC.NET擴(kuò)展Windows磁盤(pán)清理工具的功能
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來(lái)源:模板無(wú)憂//所屬分類:.Net教程/更新時(shí)間:2009-09-15
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