通过接口

 class Program { static void Main1(string[] args) { var controller = new Controller(new CallBack()); controller.Execute(); } } public interface ICallBack { void Run(); } public class CallBack : ICallBack { public void Run() { Console.WriteLine(DateTime.Now); } } public class Controller { private ICallBack _callBack; public Controller(ICallBack callBack) { this._callBack = callBack; } public void Execute() { Console.WriteLine("点击任何键返回当前时间，ESC退出"); while (Console.ReadKey(true).Key != ConsoleKey.Escape) { _callBack.Run(); } } }

通过委托

 public class DelegateCallback { static void Main(string[] args) { var controller = new Controller(new Action(() => Console.WriteLine(DateTime.Now))); //controller.AddEvent(() => Console.WriteLine(DateTime.Today)); controller.Execute(); } } public class Controller { private Action _showTime; public Controller(Action showTime) { this._showTime += showTime; } public void AddEvent(Action act) { this._showTime += act; } public void Execute() { Console.WriteLine("点击任何键返回当前时间，ESC退出"); while (Console.ReadKey(true).Key != ConsoleKey.Escape) { _showTime(); } } }

定时回调

 public class TimeCallback { static void Main(string[] args) { var ti = new TaskInfo(); var tm = new Timer(state => { TaskInfo info = state as TaskInfo; info.count++; Console.WriteLine(info.count); }, ti, 0, 1000); Console.ReadKey(); } } public class TaskInfo { public int count = 0; }