WPF TextBox inheritance KeyDown does not trigger on space?

Question

I have a class that inherits the wpf textbox and i have overridden the OnTextChanged, OnTextInput, OnKeyDown now to the funny part..

If i press any thing but Space all 3 events are triggered, but if i press space only the OnTextChanged is triggered? so why doesn't space count as a key or textinput?

Answer 1

您必须处理PreviewKeyDown事件，因为默认情况下处理空间并因此框架使用该空间。