spring mvc 为什么使用接口,然后写个实现类的方式
private void canvas1_SizeChanged(object sender, SizeChangedEventArgs e)
{
canvas2.SetValue(Canvas.LeftProperty, (canvas1.ActualWidth - canvas2.ActualWidth) / 2);
canvas2.SetValue(Canvas.TopProperty, (canvas1.ActualHeight - canvas2.ActualHeight) / 2);
}