Question

I need to enable/disable a WPF button based on the return of a method.

I have a HasPermission method that tells me if the user can or not click on that button.

I’ve seen that I could use Command => CanExecute to avoid the execution of the action. Seen here:

How to enable/disable a button in WPF?

My question is, I have a lot of Windows in which I’ll be checking for the permission, is this the best approach? Will I really have to write from 2 to N commands for every window I have?

Is there any way to make this global?

For instance, could I create the generic commands (Search/Create/…) and then only get the window it was called from and pass it to my HasPermission method?

Answer 1

You can absolutely make a static class that holds static commands, and refer to those from anywhere in your XAML.

It goes like this:

public static class GlobalCommands
{
   //ICommand can be DelegateCommand, RelayCommand... whatever floats your boat.
   public static ICommand SearchCommand { get; set; }

   //Implementation, and more static commands...
}

Then in some view:

<UserControl ...>
   ...
   <Button Content="Search" Command="{x:Static infra:GlobalCommands.SearchCommand}" />
   ...
</UserControl>

Of course, infra: is a xmlns namespace mapping to GlobalCommands‘ namespace.