C# 用接口实现Callback

1）定义Callback接口

        public interface IBack
        {
            int run(int a, int b);
        }

 2）定义类，实现Callback接口

        public class AddCallback : IBack
        {
            public int run(int a, int b)
            {
                Thread.Sleep(5000);
                return a + b;
            }
        }

3）定义调用Callback函数的类

        public class PrintResult
        {
            IBack CallbackAdd = null;
            public PrintResult(IBack CallbackAdd)
            {
                this.CallbackAdd = CallbackAdd;
            }
            public void PrintAdd(int a, int b)
            {
                Console.WriteLine($"{a}+{b}={ this.CallbackAdd.run(a, b)}");
            }
        }

4）Main函数

        static void Main(string[] args)
        {
            PrintResult pr = new PrintResult(new AddCallback());
            pr.PrindAdd(1, 2);
        }