Dispatcher.Invoke with anonymous delegate works in Silverlight but not WPF

Answer 1

You need to specify an explicit delegate type. Just use an Action.

Dispatcher.BeginInvoke(new Action(() => populateInbox(args.Jobs));

You could, however, avoid having to close over the args.Jobs value like this:

Dispatcher.BeginInvoke(new Action((jobs) => populateInbox(jobs)), jobs);

This is because the single-parameter version of Dispatcher.BeginInvoke has a different signature in Silverlight than in WPF. In Silverlight, it takes an Action, which allows the C# compiler to implicitly type your lambda as an Action. In WPF, it takes a Delegate (like its Control.BeginInvoke analog in Winforms), so the C# compiler has to have a delegate type explicitly specified.