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  • 转-观察模式 猫叫鼠跑人醒

    猫大叫一声,所有的老鼠都开始逃跑,主人被惊醒。

      public interface Observer
        {
            void Response();    //观察者的响应,如是老鼠见到猫的反映
        }
        public interface Subject
        {
            void AimAt(Observer obs);  //针对哪些观察者,这里指猫的要扑捉的对象---老鼠
        }
        public class Mouse : Observer
        {
            private string name;
            public Mouse(string name, Subject subj)
            {          
                this.name = name;
                subj.AimAt(this);
            }
           
            public void Response()
            {
                Console.WriteLine(name + " attempt to escape!");
            }
        }
        public class Master : Observer
        {  
            public Master(Subject subj)
            {          
                subj.AimAt(this);
            }
           
            public void Response()
            {
                Console.WriteLine("Host waken!");
            } 
        }

        public class Cat : Subject
        {
            private ArrayList observers;
            public Cat()
            {  
                this.observers = new ArrayList();
            }
            public void AimAt(Observer obs)
            {
                this.observers.Add(obs);
            }
            public void Cry()
            {
                Console.WriteLine("Cat cryed!");
                foreach (Observer obs in this.observers)
                {
                    obs.Response();
                }
            }
        }
        class MainClass
        {      
            static void Main(string[] args)
            {
                Cat cat = new Cat();
                Mouse mouse1 = new Mouse("mouse1", cat);
                Mouse mouse2 = new Mouse("mouse2", cat);
                Master master = new Master(cat);
                cat.Cry();
            }
        }

    设计方法二: 使用event -- delegate设计..
    public delegate void SubEventHandler();
        public abstract class Subject
        {
            public event SubEventHandler SubEvent;
            protected void FireAway()
            {
                if (this.SubEvent != null)
                    this.SubEvent();
            }  
        }
        public class Cat : Subject
        { 
            public void Cry()
            {
                Console.WriteLine("cat cryed.");
                this.FireAway();
            }
        }
        public abstract class Observer
        {
            public Observer(Subject sub)
            {
                sub.SubEvent += new SubEventHandler(Response);
            }
            public abstract void Response();   
        }
        public class Mouse : Observer
        {
            private string name;
            public Mouse(string name, Subject sub) : base(sub)
            {  
                this.name = name;
            }
            public override void Response()
            {
                Console.WriteLine(name + " attempt to escape!");
            }
        }
        public class Master : Observer
        {
            public Master(Subject sub) : base(sub){}
            public override void Response()
            {
                Console.WriteLine("host waken");
            }
        }
        class Class1
        {
            static void Main(string[] args)
            {
                Cat cat = new Cat();
                Mouse mouse1 = new Mouse("mouse1", cat);
                Mouse mouse2 = new Mouse("mouse2", cat);
                Master master = new Master(cat);
                cat.Cry();
            }
        }

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  • 原文地址:https://www.cnblogs.com/yufan27209/p/4032552.html
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