c# 子线程运行完通知主线程

  class Program
    {
        public delegate void Entrust(string str);//定义一个委托
        static void Main(string[] args)
        {
            Entrust callback = new Entrust(CallBack);

            Thread th = new Thread(Fun);
            th.IsBackground = true;
            th.Start(callback);
            Console.ReadKey();
        }

        private static void Fun(object obj)
        {
            for (int i = 0; i < 10; i++)
            {
                Console.WriteLine("子线程运行了{0}", i);
                Thread.Sleep(500);
            }
            Entrust callBack = obj as Entrust;
            callBack("子线程执行完成通知主线程");
        }

        private static void CallBack(string str)
        {
            Console.WriteLine(str);
        }
    }

上面就是通过委托向主线程传值（也就是通知主线程）的过程，也可以用.NET为我们提供的泛型委托来处理

public class Program
    {
        //定义一个为委托
        public delegate void Entrust(string str);
        static void Main(string[] args)
        {
            Action<string> callback = ((string str) => { Console.WriteLine(str); });
            //Lamuda表达式
            Thread th = new Thread(Fun);
            th.IsBackground = true;
            th.Start(callback);
            Console.ReadKey();
        }
        private static void Fun(object obj) {
            for (int i = 1; i <= 10; i++)
            {
                Console.WriteLine("子线程循环操作第 {0} 次",i);
                Thread.Sleep(500);
            }
            Action<string> callback = obj as Action<string>;
            callback("我是子线程，我执行完毕了，通知主线程");
        }

    }