public IAsyncResult BeginEvent(object sender, EventArgs e, AsyncCallback cb, object extradata)
{
if (_result != null)
{
throw new InvalidOperationException();
}
if (_context.PreventNextStage)
{
var noop = new StageAsyncResult(cb, extradata, () => { });
noop.TryComplete();
noop.InitialThreadReturning();
return(noop);
}
_context.PreventNextStage = true;
_responseShouldEnd = true;
_context.PushExecutingStage(this);
AppFunc entryPoint = _stage.EntryPoint ?? _context.PrepareInitialContext((HttpApplication)sender);
IDictionary <string, object> environment = _context.TakeLastEnvironment();
TaskCompletionSource <object> tcs = _context.TakeLastCompletionSource();
var result = new StageAsyncResult(cb, extradata, () =>
{
var application = ((HttpApplication)sender);
if (_responseShouldEnd)
{
application.CompleteRequest();
}
});
_result = result;
environment[Constants.IntegratedPipelineCurrentStage] = _stage.Name;
// System.Web does not allow us to use async void methods to complete the IAsyncResult due to the special sync context.
#pragma warning disable 4014
RunApp(entryPoint, environment, tcs, result);
#pragma warning restore 4014
result.InitialThreadReturning();
return(result);
}
public IAsyncResult BeginEvent(object sender, EventArgs e, AsyncCallback cb, object extradata)
{
if (_result != null)
{
throw new InvalidOperationException();
}
if (_context.PreventNextStage)
{
var noop = new StageAsyncResult(cb, extradata, () => { });
noop.TryComplete();
noop.InitialThreadReturning();
return(noop);
}
_context.PreventNextStage = true;
_responseShouldEnd = true;
_context.PushExecutingStage(this);
Func <IDictionary <string, object>, Task> entryPoint = _stage.EntryPoint ?? _context.PrepareInitialContext((HttpApplication)sender);
IDictionary <string, object> environment = _context.TakeLastEnvironment();
TaskCompletionSource <object> tcs = _context.TakeLastCompletionSource();
var result = new StageAsyncResult(cb, extradata, () =>
{
var application = ((HttpApplication)sender);
if (_responseShouldEnd)
{
application.CompleteRequest();
}
});
_result = result;
environment[Constants.IntegratedPipelineCurrentStage] = _stage.Name;
try
{
entryPoint.Invoke(environment)
.CopyResultToCompletionSource(tcs, null)
.ContinueWith(t => result.TryComplete(), TaskContinuationOptions.ExecuteSynchronously)
.Catch(ci => ci.Handled());
}
catch (Exception ex)
{
// Flow the exception back through the OWIN pipeline.
tcs.TrySetException(ex);
result.TryComplete();
return(result);
}
result.InitialThreadReturning();
return(result);
}
