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/// <summary>
/// 鎶借薄瑙傚療绫�
/// </summary>
abstract public class Observer{
public abstract void Update();
}


/// <summary>
/// 鍏蜂綋瑙傚療绫�
/// </summary>
public class Concreteobserver:Observer{
private string name;
private string observerState;
private ConcreteSubject subject;


public Concreteobserver(ConcreteSubject subject,string name){
this.subject=subject;
this.name= name;
}


public override void Update(){
observerState=subject.GetState();
Console.write(鈥滆�傚療鑰厈0}鐨勬柊鐘舵�佹槸{1}鈥�,name,observerState);
}
}


/// <summary>
/// 鎶借薄涓婚�樼被
/// </summary>
abstract public class Subject(){
private List<observer> observers = new List<observer>() ;


public void? Attach(Observer observer){
observers.Add(Observer);
}


public void Detach(Observer Observer){
observers.Remove(Observer);
}


public void NotifyObservers(){
foreach(Observer o in observers){
o.Update();
}
}
}


/// <summary>
/// 鍏蜂綋涓婚�樼被
/// </summary>
public class ConcreteSubject:Subject{
private string subjectState;


public string SubjectState{
get{return subjectstate;}
set{subjectstrate=value;}
}


public void GetState(){
return subjectstate;
}
}


//client绔�
static void Main(string[] args)
{
ConcreteSubject c = new ConcreteSubject();
Concreteobserver o1 = new Concreteobserver(c,鈥漍鈥�);
Concreteobserver o2 = new Concreteobserver(c,鈥漎鈥�);
Concreteobserver o3 = new Concreteobserver((c,鈥漐鈥�);
c.Attach(o1);
c.Attach(o2);
c.Attach(o3);
c.subjectstate=鈥漚bc鈥�;
c.Nofify();


Console.ReadLine();
}