Using of RaiseCanExecuteChanged

I make two methodes like this:

private void Next(string argument) { Current = Clients[Clients.IndexOf(Current) + 1]; ((DelegateCommand)NextCommand).RaiseCanExecuteChanged(); }

private void Previous(string argument) { Current = Clients[Clients.IndexOf(Current) - 1]; ((DelegateCommand)PreviousCommand).RaiseCanExecuteChanged();

}

and bind to the xaml:

Every thing work fine. And the next button becomes inactive/grey out when it hits the last post. The problem is it (the Next button) still inactive when I click the Previous button. The Next button becomes inactive all the time. My question is how I could make 开发者_开发技巧the Next button active again? Thank for all help.

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I assume you are talking about a WPF Application.

There are several reasons your button could become / stay inactive:

• Your CanExecute implementation is faulty and returns false even if it should return true
• You didnt implement CanExecute or didnt hook it up correctly
• The CommandManager didn't realize it's time to requery the commands
• You've got a problem with the Focus on your Window / Control

You need to show more of the code so it gives us a broader picture of what you are trying to do.