c#委托----单一的委托

namespace Delegate
{
    public delegate double Mydelegate(double x,double y);//注意参数
    class myMethod
    {
        public static double Multiply(double x, double y)//被委托的方法 必须与委托的方法的参数一致
        {
            return x * y;
        }
        public static double Add(double x, double y)
        {
            return x + y;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("输入两个数字");
            double x = Convert.ToDouble(Console.ReadLine());
            double y = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("选择A为相加，选择M为相乘");
            string s = Console.ReadLine();

            Mydelegate md;
            if (s.ToUpper()== "A")
            {
                md = new Mydelegate(myMethod.Add);//相当于把相加的方法 委托给了md

            }
            else
            {
                md = new Mydelegate(myMethod.Multiply);//注意，这里的方法不用写()
            }

            Console.WriteLine(md(x, y));
            Console.Read();
        }
    }
}