//重载形状改变函数
protected override void OnSharpChanged(SharpChangedEventArgs e)
{
base.OnSharpChanged(e);
}
static void Sharp_SharpChanged(object sender, SharpChangedEventArgs e)
{
if (sender is Circle) Console.WriteLine("形状变化后圆形面积为{0}", e.Area);
else if (sender is Rectangle) Console.WriteLine("形状变化后矩形面积为{0}", e.Area);
}
//形状改变虚函数
protected virtual void OnSharpChanged(SharpChangedEventArgs e)
{
if (SharpChanged != null) SharpChanged(this, e);//触发形状改变事件
}