How to enable/disable WPF button based on method return

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?

Louis Kottmann · Accepted Answer · 2012-11-04 17:59:56Z

2

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.

answered Nov 4, 2012 at 17:59

Louis Kottmann

16.8k5 gold badges67 silver badges89 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

eestein Over a year ago

Got it, but how would I tell the window the button was called from? Thanks.

Louis Kottmann Over a year ago

@eestein You'd pass it as CommandParameter. I'd make the viewmodel implement some ISearchable interface and pass that to the command.

Collectives™ on Stack Overflow

How to enable/disable WPF button based on method return

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related