Clever Geek Handbook

Testing WPF UserControls Devices

Is it possible to test my WPF custom elements from NUnit (or similar)? If I create an instance of usercontrol in a unit test like:

// Create an instance of the WPF UserControl
var view = new ChildrenListView();

I am getting the following error:

"The calling thread must be STA, because many UI components require this"

I have a feeling that I am missing something very important here.

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2 answers


This article shows you how to fix this problem: NUnit STA Threads and WPF Testing .



If that doesn't fix it, check out the latest post in this forum: Testing a WPF Application with NUnit

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Use the [STAThread] attribute .



    [Test]
    [STAThread]
    public void TestConstructorDoesNotThrow()
    {
        Expect(() => new ChildrenListView(), Throws.Nothing);
    }
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