I want to implement a new Attached Property for buttons which registers if the mouse is over and executes a Command if so. This is the C# code:

public class MouseMovement 
    {

     
        public static readonly DependencyProperty MouseOverCommandProperty =
            DependencyProperty.RegisterAttached("MouseOverCommand", typeof(ICommand), typeof(MouseMovement), 
                new FrameworkPropertyMetadata(new PropertyChangedCallback(MouseOverCommandChanged)));




       

        private static void MouseOverCommandChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            FrameworkElement element = (FrameworkElement)d;
            element.MouseEnter  = new MouseEventHandler(element_MouseOver);
        }

        private static void element_MouseOver(object sender, MouseEventArgs e)
        {
            FrameworkElement element = (FrameworkElement)sender;
            ICommand cmd = GetMouseOverCommand(element);
            cmd.Execute(e);
        }

        public static void SetMouseOverCommand(UIElement element, ICommand value)
        {
            element.SetValue(MouseOverCommandProperty, value);
        }

        private static ICommand GetMouseOverCommand(FrameworkElement element)
        {
            return (ICommand)element.GetValue(MouseOverCommandProperty);
        }
}

<iframe name="sif1" sandbox="allow-forms allow-modals allow-scripts" frameborder="0"></iframe>

And the xaml:

<Button mouseEvents:MouseMovement.MouseOverCommand="{Binding ButtonMouseOverCommand}"  Grid.Row="0" Background="Transparent" BorderThickness="0" >
                <StackPanel>
                    <Image />
                    <TextBlock Text="BL-Invoices" Foreground="White"/>
                </StackPanel>
            </Button>

<iframe name="sif2" sandbox="allow-forms allow-modals allow-scripts" frameborder="0"></iframe>

Everytime I try to run this I get the error: "Binding can not be specified for the property "SetMouseOverCommand" of type button. Binding can only be specified for a DependencyProperty of a DependencyObject"

I got a little bit stuck at this point, maybe you have some ideas.

Edit: As stated in the accepted answer the mistake was a typo. The AttachedProperty name was set to "MouveOverCommand" instead of "MouseOverCommand". I edited the code snippet to be correct.

CodePudding user response：

It looks like it's just a typo, I put your code into a sample project and it worked as expected.

public static readonly DependencyProperty MouseOverCommandProperty =
        DependencyProperty.RegisterAttached("MouseOverCommand", typeof(ICommand), typeof(MouseMovement), 
            new FrameworkPropertyMetadata(new PropertyChangedCallback(MouseOverCommandChanged)));