Calling async code from WPF event handlers synchronously

RunSynchronouslyWithDispatcher.cs

    
    // BEWARE: There is no universal way to synchronously wait for async tasks. This can be used in a WPF context only.
    private static void RunSynchronously(Func<Task> func)
    {
        // Gets the awaiter for the task
        var awaiter = func().ConfigureAwait(false).GetAwaiter();

        // Creates a new dispatcher frame that will lock (like Window.ShowDialog()) but with the message pump still running
        // The dispatcher frame terminates only when the task to wait for has completed
        DispatcherFrame frame = new DispatcherFrame();
        awaiter.OnCompleted(() => frame.Continue = false);
        Dispatcher.PushFrame(frame);

        // Call GetResult for the sake of not swallowing exceptions (ok here as we know the task has not yet completed).
        awaiter.GetResult();
    }