方法的调用
    delegate int test1(int a);
    class Program
    {
       
     
        static int num = 10;
        static void Main(string[] args)
        {
            test1 t = new test1(max);
            t(40);
            Console.WriteLine("max,{0}", num);
            Console.ReadLine();
        }
        public static int max(int a)
        {
            num += a;
            return num;
        }
    }

类额实例化

    class  weituo {
        public   int num = 10;
        //非静态
        public  int max(int a)
        {
            num += a;
            return num;
        }
        
    }

Main ()
{
     weituo wt = new weituo();
            test1 t1 = new test1(wt.max);
            t1(50);
}