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//方法一:
List<UIElement> canvas = StackPanel1.Children.Where(o => o.GetType() == typeof(MyKongJian)).ToList();
//方法二
for (int i = 0; i < StackPanel1.Children.Count; i++)
{
meKJ= StackPanel1.Children[i] as MyKongJian; //如果类型不一致则返回null
if (meKJ!= null)
{
// doing......
}
}