Show WPF window from test unit

Question

I am running a test unit (and learning about them). Quite simply, my unit creates a List and passes it to my MainWindow.

The issue I have is after I show()

Answer 1

The WPF Window must be created and shown on a thread which supports the WPF window infrastructure (message pumping).

[TestMethod]
    public void TestMethod1()
    {
        MainWindow window = null;

        // The dispatcher thread
        var t = new Thread(() =>
        {
            window = new MainWindow();

            // Initiates the dispatcher thread shutdown when the window closes
            window.Closed += (s, e) => window.Dispatcher.InvokeShutdown();

            window.Show();

            // Makes the thread support message pumping
            System.Windows.Threading.Dispatcher.Run();
        });

        // Configure the thread
        t.SetApartmentState(ApartmentState.STA);
        t.Start();
        t.Join();
    }

Note that:

• The window must be created and shown inside the new thread.
• You must initiate a dispatcher (System.Windows.Threading.Dispatcher.Run()) before the ThreadStart returns, otherwise the window will show and die soon after.
• The thread must be configured to run in STA apartment.

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