c# 委托初用法

  public delegate void Print(string printStr);
        public static void DelegateMethod(string printStr)
        {
            Console.WriteLine(printStr.Reverse().ToArray());
        }

        static string ReverseString(string s)
        {
            return new string(s.Reverse().ToArray());
        }
        static void Main(string[] args)
        {
            //旧方法 
            Print print = DelegateMethod;
            print("a string");

            //新方法 
            Func<string, string> rev = ReverseString;
            Console.WriteLine(rev("a string"));
            //原始方法 
            Console.WriteLine(ReverseString("a string"));

            Console.ReadKey(true);
        }