Set command target to template part

Question

1) Custom DataGrid with CommandBindings.

2) A RoutedCommand Definition.

3) A Command Target Definition. (XAML)

CS :

    //(1)
    publi         


        

Answer 1

Ok , so along side all the type of RoutedCommands i placed a few extension methods to register the routed command with the type it self ,

public static class Commands
{
    public static RoutedCommand ClearInputCommand = new RoutedCommand("ClearInputCommand", typeof(Commands));

    public static void RegisterCommand(this UIElement uiElement, RoutedCommand command, ExecutedRoutedEventHandler execute, CanExecuteRoutedEventHandler canExecute = null)
    {
        uiElement.RegisterCommand(new CommandBinding(command, execute, canExecute));
    }

    public static void RegisterCommand(this UIElement uiElement, CommandBinding commandBinding)
    {
        CommandManager.RegisterClassCommandBinding(typeof(object), commandBinding);         
    }

    public static void UnRegisterCommand(this UIElement uiElement, RoutedCommand command)
    {
        for (int i = 0; i < uiElement.CommandBindings.Count; i++)
        {
            CommandBinding c = uiElement.CommandBindings[i];
            if (c.Command == command)
            {
                uiElement.CommandBindings.RemoveAt(i);
            }
        }           
    }

    public static void UnRegisterCommand(this UIElement uiElement, CommandBinding commandBinding)
    {
        uiElement.CommandBindings.Remove(commandBinding);                               
    }
} 

and then just called it from the constructor of that class , i'm not sure if i need to unregister this tough it seems to me that this can cause memory leaks , since it holds a reference to the Execute and CanExecute delegates.

in order to Unregister them i would have to keep track of all the registered uielements and clear there CommandBindings on application shut down.

i think a better solution would be to use something like prisms CompositeCommand. but this would do for now.