c# delegate 封装 方法的复用 方法里面调用方法

 class Program
    {
        public delegate int Run(int i, int j);
        public static void Main(string[] args)
        {
            MainFunction(Add);
            MainFunction(Delete);
            MainFunction(Ride);
            MainFunction(Divide);
        }

        public static void MainFunction(Run r)
        {
            // do someThing
            r(10, 10);
            // do someThing
        }

        public static int Add(int i, int j)
        {
            return i + j;
        }
        public static int Delete(int i, int j)
        {
            return i - j;
        }

        public static int Ride(int i, int j)
        {
            return i * j;
        }
        public static int Divide(int i, int j)
        {
            return i * j;
        }

    }

  class Program
    {
        public delegate void Run(int i, int j);
        public static void Main(string[] args)
        {
            MainFunction(Add);
            MainFunction(Delete);
            MainFunction(Ride);
            MainFunction(Divide);
        }

        public static void MainFunction(Run r)
        {
          
            r(10, 10);
            // do someThing
        }

        public static void Add(int i, int j)
        {
            // do someThing
             var r= i + j;
            // do someThing
        }
        public static void Delete(int i, int j)
        {
            // do someThing
            var r = i - j;
            // do someThing
        }

        public static void Ride(int i, int j)
        {
            // do someThing
            var r = i * j;
            // do someThing
        }
        public static void Divide(int i, int j)
        {
            // do someThing
            var r = i * j;
            // do someThing
        }

    }