if (HttpRuntime.UseIntegratedPipeline)
{
this._stepManager = new PipelineStepManager(this);
}
else
{
this._stepManager = new ApplicationStepManager(this);
}
this._stepManager.BuildSteps(this._resumeStepsWaitCallback);
我想大家看到这里就会明白为什么IIS7会有集成模式和经典模式了吧。可能大家不怎么重视此代码，让我们来看看经典模式的ApplicationStepManager
复制代码 代码如下:
internal class ApplicationStepManager : HttpApplication.StepManager
{
// Fields
private int _currentStepIndex;
private int _endRequestStepIndex;
private HttpApplication.IExecutionStep[] _execSteps;
private int _numStepCalls;
private int _numSyncStepCalls;
private WaitCallback _resumeStepsWaitCallback;
// Methods
internal ApplicationStepManager(HttpApplication app) : base(app)
{
}
internal override void BuildSteps(WaitCallback stepCallback)
{
ArrayList steps = new ArrayList();
HttpApplication app = base._application;
bool flag = false;
UrlMappingsSection urlMappings = RuntimeConfig.GetConfig().UrlMappings;
flag = urlMappings.IsEnabled && (urlMappings.UrlMappings.Count > 0);
steps.Add(new HttpApplication.ValidateRequestExecutionStep(app));
steps.Add(new HttpApplication.ValidatePathExecutionStep(app));
if (flag)
{
steps.Add(new HttpApplication.UrlMappingsExecutionStep(app));
}
app.CreateEventExecutionSteps(HttpApplication.EventBeginRequest, steps);
app.CreateEventExecutionSteps(HttpApplication.EventAuthenticateRequest, steps);
app.CreateEventExecutionSteps(HttpApplication.EventDefaultAuthentication, steps);
app.CreateEventExecutionSteps(HttpApplication.EventPostAuthenticateRequest, steps);
app.CreateEventExecutionSteps(HttpApplication.EventAuthorizeRequest, steps);
app.CreateEventExecutionSteps(HttpApplication.EventPostAuthorizeRequest, steps);
app.CreateEventExecutionSteps(HttpApplication.EventResolveRequestCache, steps);
app.CreateEventExecutionSteps(HttpApplication.EventPostResolveRequestCache, steps);
steps.Add(new HttpApplication.MapHandlerExecutionStep(app));
app.CreateEventExecutionSteps(HttpApplication.EventPostMapRequestHandler, steps);
app.CreateEventExecutionSteps(HttpApplication.EventAcquireRequestState, steps);
app.CreateEventExecutionSteps(HttpApplication.EventPostAcquireRequestState, steps);
app.CreateEventExecutionSteps(HttpApplication.EventPreRequestHandlerExecute, steps);
steps.Add(new HttpApplication.CallHandlerExecutionStep(app));
app.CreateEventExecutionSteps(HttpApplication.EventPostRequestHandlerExecute, steps);
app.CreateEventExecutionSteps(HttpApplication.EventReleaseRequestState, steps);
app.CreateEventExecutionSteps(HttpApplication.EventPostReleaseRequestState, steps);
steps.Add(new HttpApplication.CallFilterExecutionStep(app));
app.CreateEventExecutionSteps(HttpApplication.EventUpdateRequestCache, steps);
app.CreateEventExecutionSteps(HttpApplication.EventPostUpdateRequestCache, steps);
this._endRequestStepIndex = steps.Count;
app.CreateEventExecutionSteps(HttpApplication.EventEndRequest, steps);
steps.Add(new HttpApplication.NoopExecutionStep());
this._execSteps = new HttpApplication.IExecutionStep[steps.Count];
steps.CopyTo(this._execSteps);
this._resumeStepsWaitCallback = stepCallback;
}
internal override void InitRequest()
{
this._currentStepIndex = -1;
this._numStepCalls = 0;
this._numSyncStepCalls = 0;
base._requestCompleted = false;
}
[DebuggerStepperBoundary]
internal override void ResumeSteps(Exception error)
{
bool flag = false;
bool completedSynchronously = true;
HttpApplication application = base._application;
HttpContext context = application.Context;
HttpApplication.ThreadContext context2 = null;
AspNetSynchronizationContext syncContext = context.SyncContext;
lock (base._application)
{
try
{
context2 = application.OnThreadEnter();
}
catch (Exception exception)
{
if (error == null)
{
error = exception;
}
}
try
{
try
{
Label_0045:
if (syncContext.Error != null)
{
error = syncContext.Error;
syncContext.ClearError();
}
if (error != null)
{
application.RecordError(error);
error = null;
}
if (syncContext.PendingOperationsCount > 0)
{
syncContext.SetLastCompletionWorkItem(this._resumeStepsWaitCallback);
}
else
{
if ((this._currentStepIndex < this._endRequestStepIndex) && ((context.Error != null) || base._requestCompleted))
{
context.Response.FilterOutput();
this._currentStepIndex = this._endRequestStepIndex;
}
else
{
this._currentStepIndex++;
}
if (this._currentStepIndex >= this._execSteps.Length)
{
flag = true;
}
else
{
this._numStepCalls++;
context.SyncContext.Enable();
error = application.ExecuteStep(this._execSteps[this._currentStepIndex], ref completedSynchronously);
if (completedSynchronously)
{
this._numSyncStepCalls++;
goto Label_0045;
}
}
}
}
finally
{
if (context2 != null)
{
try
{
context2.Leave();
}
catch
{
}
}
}
}
catch
{
throw;
}
}
if (flag)
{
context.Unroot();
application.AsyncResult.Complete(this._numStepCalls == this._numSyncStepCalls, null, null);
application.ReleaseAppInstance();
}
}
}
说简单一点这个类中的internal override void BuildSteps(WaitCallback stepCallback)方法就是为我们注册那19个管道事件， internal override void ResumeSteps(Exception error)就是依次执行此管道事件，而 steps.Add(new HttpApplication.MapHandlerExecutionStep(app));是映射我们的handler
复制代码 代码如下: