小编Saj*_*jad的帖子

private void RectangleTapped(object sender, TappedRoutedEventArgs e)
{
     RedRectangle.Fill.Opacity = 1.0;
     GreenRectangle.Fill.Opacity = 1.0;
     BlueRectangle.Fill.Opacity = 1.0;
     YellowRectangle.Fill.Opacity = 1.0;

     var rectangle =sender as Rectangle;
     if (rectangle != null)
     {
         rectangle.Fill.Opacity =0.25;            
     }
}

什么var rectangle=sender as Rectangle意思？

此代码也适用var Rectangle=sender as Rectangle。