WPF 鼠标按下图片变换成另一张图片

        private void Image_MouseDown(object sender, MouseButtonEventArgs e)
        {

            Image img = sender as Image;

            BitmapImage image = new BitmapImage(new Uri(System.AppDomain.CurrentDomain.BaseDirectory+@"Images\2.jpg", UriKind.Absolute));

            img.Source = image;

        }