正常來說命令應該長這樣 public interface Command { void Execute(); } public class Command_1 : Command { public Receiver_1 receiver; public string command; public Command_1(Receiver_1 receiver, string command) { this.receiver = receiver; this.command = command; } public void Execute() { receiver.Action(command); } } public class Receiver_1 { public void Action(string command) { //這裡放實作 Console.WriteLine(command); } } ============================================================================== 但我的疑問是「直接繼承Command然後實作」不就好了？ 像這樣 public class Command_2 : Command { private int command; public Command_2(int command) { this.command = command; } public void Execute() { Console.WriteLine(command); } } 是因為實作上比較不直覺嗎？ ============================================================================== 有查到一個教學https://goo.gl/mAqyG5 看到他把Receiver裡面實作各種方法 看起來滿方便的，但這樣違反開放封閉原則吧？ 所以現在已經有點搞不太懂命令模式為何要Command裡面包Receiver了 而且C#直接用Action好像還比較方便？ --

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