[WPF] How can I force a textBox in wpf to call OnLostFocus in a unit test?

tags:

views:

68

answers:

1

+2 Q:

[WPF] How can I force a textBox in wpf to call OnLostFocus in a unit test?

I have a custom component created in WPF using C#, where I have some validation that are checked when the textbox OnLostFocus is called (it is only when the user leaves the textbox I can do the validation, since only then do I have the complete input string to validate).

How can I trigger the OnLostFocus on the textBox from the unit test?

Thanks

+2 A:

You're not really clear how you're doing the testing but two things spring to mind.

If you actually want the text box to lose focus then set focus to another control by calling someOtherControl.Focus()
If you just want to test the OnLostFocus processing then call the method directly.

arx 2010-09-21 11:57:31

I do want the unit test to behave as close to the real usage scenario as possible, and this is done by manually creating the component in the test, simulating user input, and then check the validation that happens on OnLostFocus on the manually created component. I have tried as you suggest in your first point, but OnLostFocus is never called on the textbox.First I am creating a canvas. Then the custom component. Then I am adding the custom component as a child of the canvas. Finnaly I am using myCanvas.Focus(), but the OnLostFocus is never called!

code-zoop 2010-09-22 06:45:49

Can a canvas accept focus? Try adding another control to the canvas (e.g. a text box which can definitely accept focus) and set the focus to that.

arx 2010-09-22 11:23:22

ansaurus

tags:

views:

answers:

[WPF] How can I force a textBox in wpf to call OnLostFocus in a unit test?

related questions