‫بستن یک پنجره از طریق ViewModel با استفاده از خصوصیت های پیوست شده هنگام استفاده از الگوی MVVM

namespace TestProject.XamlServices
{
    public class CloseBehavior
    {
        public static readonly DependencyProperty CloseProperty = 
DependencyProperty.RegisterAttached("Close", typeof(bool), typeof(CloseBehavior), new UIPropertyMetadata(false, OnClose));

        private static void OnClose(DependencyObject sender, DependencyPropertyChangedEventArgs e)
        {
            if (!(e.NewValue is bool) || !((bool) e.NewValue)) return;
            var win = GetWindow(sender);
            if (win != null)
                win.Close();
        }

        private static Window GetWindow(DependencyObject sender)
        {
            Window w = null;
            if (sender is Window)
                w = (Window)sender;
            return w ?? (w = Window.GetWindow(sender));
        }

        public static bool GetClose(Window target)
        {
            return (bool)target.GetValue(CloseProperty);
        }

        public static void SetClose(DependencyObject target, bool value)
        {
            target.SetValue(CloseProperty, value);
        }
    }
}