Question

Does someone know the difference between

Dispatcher.BeginInvoke(DispatcherPriority.Background, new ThreadStart(() =>
{

and

Dispatcher.BeginInvoke(DispatcherPriority.Background, new Action(() =>
{

Answer 1

There should be no difference. ThreadStart and Action are defined as

public delegate void ThreadStart();

public delegate void Action();

i.e., delegate with no parameters and no return value. So they are semantically the same.

---

However, I would use Action and not ThreadStart, as ThreadStart is strongly associated with Thread constructor, so the code with ThreadStart can hint to direct thread creation and therefore be slightly misleading.