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I am trying to call a method that started on a background thread on the UI thread calling BeginInvoke and passing in a delegate as follows:
Dispatcher.BeginInvoke(Function() UpdateApplicationDataUI())
to call this method:
Private Sub UpdateApplicationDataUI()
...
End Sub
However, I get an error in the call to BeginInvoke (the UpdateApplicationDataUI portion of the delegate is stating "Expression does not produce a value"). I'm sure I'm missing something simple...any ideas?
Did more research and answered my own question:
Me.Dispatcher.BeginInvoke(Function() New Action(AddressOf UpdateApplicationDataUI))
216
BeginInvoke(DispatcherPriority, Delegate) Executes the specified delegate asynchronously at the specified priority on the thread the Dispatcher is associated with. BeginInvoke(Delegate, DispatcherPriority, Object[])
Invoke(DispatcherPriority, TimeSpan, Delegate)Executes the specified delegate synchronously at the specified priority and with the specified time-out value on the thread the Dispatcher was created.
The Dispatcher maintains a prioritized queue of work items for a specific thread. When a Dispatcher is created on a thread, it becomes the only Dispatcher that can be associated with the thread, even if the Dispatcher is shut down.
Invoke : Executes on the UI thread, but calling thread waits for completion before continuing. Control. BeginInvoke : Executes on the UI thread, and calling thread doesn't wait for completion.
I think the syntax in VB.net for this is
Dispatcher.BeginInvoke(Sub() UpdateApplicationDataUi())
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