在单个Switch语句中进行模式匹配和条件绑定

enum ShapeType { Circle, Square, Triangle }

class Shape
{
    public ShapeType Type { get; set; }
    public double Size { get; set; }
}

class Program
{
    static void Main()
    {
        Shape shape = new Shape { Type = ShapeType.Circle, Size = 5 };

        switch (shape)
        {
            case Shape s when s.Type == ShapeType.Circle && s.Size > 4:
                Console.WriteLine("Large circle");
                break;
            case Shape s when s.Type == ShapeType.Circle:
                Console.WriteLine("Small circle");
                break;
            case Shape s when s.Type == ShapeType.Square && s.Size > 6:
                Console.WriteLine("Large square");
                break;
            case Shape s when s.Type == ShapeType.Square:
                Console.WriteLine("Small square");
                break;
            default:
                Console.WriteLine("Unknown shape or size");
                break;
        }
    }
}