CanExecute method going to false problem

问题

Well, in our application this usually works fine. But at some point, none of the CanExecute methods fire (even if I explicitly call CommandManager.InvalidateRequerySuggested(), the CanExecute methods don't run). Anyway, despite the fact that they don't run, they all get set to false, so every button, menu item, etc, bound to a CommandBinding, gets disabled until I click the MainWindow.

Now, I suspect another Window causing this, when we do a certain action, a Window pops up, and then after the next action, all the buttons become disabled, without going through the CanExecute method.

Has anyone seen such a behavior? Any suggestion on how to solve this, is greatly appreciated.

Thanks.

回答1:

Fixed it. It was related to the other window I mentioned, but it wasn't exactly that. The problem was that we had a method to hide the mentioned window, in that method, we gave focus back to the main window, and THAT was the problem. Not sure how or why, but removing the

App.MainWindow.Focus()

Line fixed this problem. So, whenever you close or hide a child window, do not call the Focus() method on your Main one.

Thanks!

来源：https://stackoverflow.com/questions/3603815/canexecute-method-going-to-false-problem