SynchronousProgress_T

        public class SynchronousProgress<T> : IProgress<T>
        {
            private readonly SynchronizationContext _Context;
            private readonly Action<T> _Action;

            public SynchronousProgress(Action<T> action)
            {
                _Action = action;
                _Context = SynchronizationContext.Current ?? new SynchronizationContext();
            }

            private void Callback(object state)
            {
                _Action?.Invoke((T)state);
            }

            public void Report(T value)
            {
                _Context.Send(Callback, value);
            }
        }