continue to task

continue.cs

        public static Task<TNewResult> ContinueWithTask<TContinue, TNewResult>(this Task<TContinue> task, Func<Task<TContinue>, Task<TNewResult>> Continuation, CancellationToken CancellationToken)
        {
            var Completion = new TaskCompletionSource<TNewResult>();
            task.ContinueWith(t =>
            {
                if (CancellationToken.IsCancellationRequested)
                {
                    Completion.SetCanceled();
                    return;
                }
                if (t.IsFaulted)
                {
                    Completion.TrySetException(t.Exception);
                    return;
                }

                Continuation(t).ContinueWith(t2 =>
                {
                    if (CancellationToken.IsCancellationRequested || t2.IsCanceled) Completion.TrySetCanceled();
                    else if (t2.IsFaulted) Completion.TrySetException(t2.Exception);
                    else Completion.SetResult(t2.Result);
                });
            });

            return Completion.Task;
        }