protected IAsyncResult AsyncPageBeginProcessRequest(HttpContext context, AsyncCallback callback, object extraData)
{
this.SetIntrinsics(context, true);
if (this._asyncInfo == null)
{
this._asyncInfo = new PageAsyncInfo(this);
}
this._asyncInfo.AsyncResult = new HttpAsyncResult(callback, extraData);
this._asyncInfo.CallerIsBlocking = callback == null;
try
{
this._context.InvokeCancellableCallback(new WaitCallback(this.AsyncPageProcessRequestBeforeAsyncPointCancellableCallback), null);
}
catch (Exception exception)
{
if (this._context.SyncContext.PendingOperationsCount == 0)
{
throw;
}
this._asyncInfo.SetError(exception);
}
if ((this._asyncTaskManager != null) && !this._asyncInfo.CallerIsBlocking)
{
this._asyncTaskManager.RegisterHandlersForPagePreRenderCompleteAsync();
}
this._asyncInfo.AsyncPointReached = true;
this._context.SyncContext.Disable();
this._asyncInfo.CallHandlers(true);
return this._asyncInfo.AsyncResult;
}
public void AddOnPreRenderCompleteAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state)
{
if (beginHandler == null)
{
throw new ArgumentNullException("beginHandler");
}
if (endHandler == null)
{
throw new ArgumentNullException("endHandler");
}
if (this._asyncInfo == null)
{
if (!(this is IHttpAsyncHandler))
{
throw new InvalidOperationException(System.Web.SR.GetString("Async_required"));
}
this._asyncInfo = new PageAsyncInfo(this);
}
if (this._asyncInfo.AsyncPointReached)
{
throw new InvalidOperationException(System.Web.SR.GetString("Async_addhandler_too_late"));
}
this._asyncInfo.AddHandler(beginHandler, endHandler, state);
}