WPF "DoEvents": how to implement it?

Question

I found this two implementation for "DoEvents" method:

SOLUTION 1:

System.Windows.Application.Current.Dispatcher.Invoke(
       System.Windows.Threading.DispatcherPriority.Background,
       new System.Threading.ThreadStart(() => { }));

SOLUTION 2:

System.Windows.Application.Current.Dispatcher.Invoke(
       System.Windows.Threading.DispatcherPriority.Background,
       new System.Action(delegate { }));

Could you explain what is the difference between these two implementations, and what is the most appropriate to use?

Thanks.

Answer 1

There is no difference between both solutions except the syntax. ThreadStart and Action are both delegates which have the same declaration and only a name is different:

public delegate void ThreadStart();
public delegate void Action();

You can also create your own delegate and use is in the same way e.g.:

public delegate void MyOwnAction();
...
Application.Current.Dispatcher.Invoke(
    DispatcherPriority.Background, new MyOwnAction(() => { }));

You can also use a specific method and not anonymous one:

private void Target()
{
    ...
}

Application.Current.Dispatcher.Invoke(
    DispatcherPriority.Background, new MyOwnAction(Target));