IAsyncResult IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData)
{
this._context = context;
this._context.ApplicationInstance = this;
this._stepManager.InitRequest();
this._context.Root();
HttpAsyncResult result = new HttpAsyncResult(cb, extraData);
this.AsyncResult = result;
if (this._context.TraceIsEnabled)
{
HttpRuntime.Profile.StartRequest(this._context);
}
this.ResumeSteps(null);
return result;
}
里面调用了ResumeSteps方法
复制代码 代码如下:
private void ResumeSteps(Exception error)
{
this._stepManager.ResumeSteps(error);
}
回到我们先前的ApplicationStepManager的ResumeSteps方法，里面有一句
error = application.ExecuteStep(this._execSteps[this._currentStepIndex], ref completedSynchronously);
Ahhpaplication的ExecuteStep方法
复制代码 代码如下:
internal Exception ExecuteStep(IExecutionStep step, ref bool completedSynchronously)
{
Exception exception = null;
try
{
try
{
if (step.IsCancellable)
{
this._context.BeginCancellablePeriod();
try
{
step.Execute();
}
finally
{
this._context.EndCancellablePeriod();
}
this._context.WaitForExceptionIfCancelled();
}
else
{
step.Execute();
}
if (!step.CompletedSynchronously)
{
completedSynchronously = false;
return null;
}
}
catch (Exception exception2)
{
exception = exception2;
if (ImpersonationContext.CurrentThreadTokenExists)
{
exception2.Data["ASPIMPERSONATING"] = string.Empty;
}
if ((exception2 is ThreadAbortException) && ((Thread.CurrentThread.ThreadState & ThreadState.AbortRequested) == ThreadState.Running))
{
exception = null;
this._stepManager.CompleteRequest();
}
}
catch
{
}
}
catch (ThreadAbortException exception3)
{
if ((exception3.ExceptionState != null) && (exception3.ExceptionState is CancelModuleException))
{
CancelModuleException exceptionState = (CancelModuleException) exception3.ExceptionState;
if (exceptionState.Timeout)
{
exception = new HttpException(SR.GetString("Request_timed_out"), null, 0xbb9);
PerfCounters.IncrementCounter(AppPerfCounter.REQUESTS_TIMED_OUT);
}
else
{
exception = null;
this._stepManager.CompleteRequest();
}
Thread.ResetAbort();
}
}
completedSynchronously = true;
return exception;
}
是真正执行IExecutionStep的Execute方法。
通过以上的分析我们可以简单的理解asp.net在管道模式下管道主要是通过ApplicationStepManager来注册和调用的。集成模式下的PipelineStepManager和ApplicationStepManager结构类似。
个人在这里只是抛砖引玉，希望大家拍砖。
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