关于 C# 8.0 的 Switch Case When 的用法

直接贴代码了：

static void Main(string[] args)
{
    SwitchSample();
}

private static void SwitchSample()
{
    Switch(new Circle { Radius =  });
    Switch(new Rectangle { Height = , Width =  });
    Switch(new Rectangle { Height = , Width =  });
}

private static void Switch(object o)
{
    switch (o)
    {
        case Circle c:
            Console.WriteLine($"it's a circle with radius {c.Radius}");
            break;
        case Rectangle r when (r.Width == r.Height):
            Console.WriteLine($"it's a square with width {r.Width}");
            break;
        case Rectangle r:
            Console.WriteLine($"it's a rectangle with width {r.Width} and height {r.Height}");
            break;
        default:
            break;
    }
}

运行截图：

谢谢浏览！