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using System;
using System.Windows;
using System.Windows.Input;
 
namespace WpfLib.Behaviors
{
    public class UIElementHelper
    {
        public static ICommand GetMouseDownCommand(DependencyObject obj)
        {
            return (ICommand)obj.GetValue(MouseDownCommandProperty);
        }
 
        public static void SetMouseDownCommand(DependencyObject obj, ICommand value)
        {
            obj.SetValue(MouseDownCommandProperty, value);
        }
 
        // Using a DependencyProperty as the backing store for MouseDownCommand.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty MouseDownCommandProperty =
            DependencyProperty.RegisterAttached("MouseDownCommand", typeof(ICommand), typeof(UIElementHelper), new PropertyMetadata(null, PropertyChanged));
        public static void PropertyChanged(DependencyObject s, DependencyPropertyChangedEventArgs e)
        {
            var cmd = e.NewValue as ICommand;
            if (cmd != null)
            {
                var element = s as UIElement;
                element.MouseDown += (sender, ex) =>
                {
                    cmd.Execute(ex);
                };
            }
        }
    }
}
 

prog.cs(9,52): error CS0246: The type or namespace name `DependencyObject' could not be found. Are you missing an assembly reference?
prog.cs(14,48): error CS0246: The type or namespace name `DependencyObject' could not be found. Are you missing an assembly reference?
prog.cs(20,32): error CS0246: The type or namespace name `DependencyProperty' could not be found. Are you missing an assembly reference?
prog.cs(22,44): error CS0246: The type or namespace name `DependencyObject' could not be found. Are you missing an assembly reference?
prog.cs(22,64): error CS0246: The type or namespace name `DependencyPropertyChangedEventArgs' could not be found. Are you missing an assembly reference?
Compilation failed: 5 error(s), 0 warnings

Standard output is empty