/// <summary>
/// Cancels asynchronous requests.
/// </summary>
/// <remarks>
/// Does not cancel requests created using XTaskAsync methods.
/// </remarks>
public virtual void CancelAsync()
{
lock (_httpWebRequestLocker)
{
if (_httpWebRequest != null)
{
_httpWebRequest.Abort();
}
}
}
protected virtual Task <object> ApiTaskAsync(HttpMethod httpMethod, string path, object parameters, Type resultType, object userState, CancellationToken cancellationToken
#if ASYNC_AWAIT
, IProgress <FacebookUploadProgressChangedEventArgs> uploadProgress
#endif
)
{
var tcs = new TaskCompletionSource <object>(userState);
if (cancellationToken.IsCancellationRequested)
{
tcs.TrySetCanceled();
return(tcs.Task);
}
HttpWebRequestWrapper httpWebRequest = null;
EventHandler <HttpWebRequestCreatedEventArgs> httpWebRequestCreatedHandler = null;
httpWebRequestCreatedHandler += (o, e) =>
{
if (e.UserState != tcs)
{
return;
}
httpWebRequest = e.HttpWebRequest;
};
var ctr = cancellationToken.Register(() =>
{
try
{
if (httpWebRequest != null)
{
httpWebRequest.Abort();
}
}
catch
{
}
});
#if ASYNC_AWAIT
EventHandler <FacebookUploadProgressChangedEventArgs> uploadProgressHandler = null;
if (uploadProgress != null)
{
uploadProgressHandler = (sender, e) =>
{
if (e.UserState != tcs)
{
return;
}
uploadProgress.Report(new FacebookUploadProgressChangedEventArgs(e.BytesReceived, e.TotalBytesToReceive, e.BytesSent, e.TotalBytesToSend, e.ProgressPercentage, userState));
};
UploadProgressChanged += uploadProgressHandler;
}
#endif
EventHandler <FacebookApiEventArgs> handler = null;
handler = (sender, e) =>
{
TransferCompletionToTask(tcs, e, e.GetResultData, () =>
{
if (ctr != null)
{
ctr.Dispose();
}
RemoveTaskAsyncHandlers(httpMethod, handler);
HttpWebRequestWrapperCreated -= httpWebRequestCreatedHandler;
#if ASYNC_AWAIT
if (uploadProgressHandler != null)
{
UploadProgressChanged -= uploadProgressHandler;
}
#endif
});
};
if (httpMethod == HttpMethod.Get)
{
GetCompleted += handler;
}
else if (httpMethod == HttpMethod.Post)
{
PostCompleted += handler;
}
else if (httpMethod == HttpMethod.Delete)
{
DeleteCompleted += handler;
}
else
{
throw new ArgumentOutOfRangeException("httpMethod");
}
HttpWebRequestWrapperCreated += httpWebRequestCreatedHandler;
try
{
ApiAsync(httpMethod, path, parameters, resultType, tcs);
}
catch
{
RemoveTaskAsyncHandlers(httpMethod, handler);
HttpWebRequestWrapperCreated -= httpWebRequestCreatedHandler;
#if ASYNC_AWAIT
if (uploadProgressHandler != null)
{
UploadProgressChanged -= uploadProgressHandler;
}
#endif
throw;
}
return(tcs.Task);
}
