What's the difference between InvokeAsync and BeginInvoke for WPF Dispatcher

Question

I noticed in .NET 4.5 that the WPF Dispatcher had gotten a new set of methods to execute stuff on the Dispatcher\'s thread called InvokeAsync. Before, .NET 4.5 we had Invoke

Answer 1

There is a difference in method signature:

BeginInvoke(Delegate, Object[])
InvokeAsync(Action)

For BeginInvoke() compiler creates array Object[] implicitly while for InvokeAsync() such array is not needed:

IL_0001:  ldarg.0
IL_0002:  call       instance class [WindowsBase]System.Windows.Threading.Dispatcher [WindowsBase]System.Windows.Threading.DispatcherObject::get_Dispatcher()
IL_0007:  ldarg.1
IL_0008:  ldc.i4.0
IL_0009:  newarr     [mscorlib]System.Object
IL_000e:  callvirt   instance class [WindowsBase]System.Windows.Threading.DispatcherOperation [WindowsBase]System.Windows.Threading.Dispatcher::BeginInvoke(class [mscorlib]System.Delegate, object[])


IL_0014:  ldarg.0
IL_0015:  call       instance class [WindowsBase]System.Windows.Threading.Dispatcher [WindowsBase]System.Windows.Threading.DispatcherObject::get_Dispatcher()
IL_001a:  ldarg.1
IL_001b:  callvirt   instance class [WindowsBase]System.Windows.Threading.DispatcherOperation [WindowsBase]System.Windows.Threading.Dispatcher::InvokeAsync(class [mscorlib]System.Action)