private static TaskCompletionSource <T> Create <T>(SourceOrign origin)
{
switch (origin)
{
case SourceOrign.NewTCS: return(new TaskCompletionSource <T>());
case SourceOrign.Create: return(TaskSource.Create <T>(null));
case SourceOrign.CreateDenyExec: return(TaskSource.CreateDenyExecSync <T>(null));
default: throw new ArgumentOutOfRangeException(nameof(origin));
}
}
