static void Main(string[] args)
{
// define a signle subject. In this example we will be able to change values 1 and 2
Subject subject = new Subject();
// create 5 new observers of the subject and give each a name. the name is just for clarity.
Observer OBS1 = new Observer();
Observer OBS2 = new Observer();
Observer OBS3 = new Observer();
Observer OBS4 = new Observer();
Observer OBS5 = new Observer();
OBS1.MObserverName = "Observer 1";
OBS2.MObserverName = "Observer 2";
OBS3.MObserverName = "Observer 3";
OBS4.MObserverName = "Observer 4";
OBS5.MObserverName = "Observer 5";
// add all 5 into the subject, so if it has a change of value all Observers are notified
subject.AddObserver(OBS1);
subject.AddObserver(OBS2);
subject.AddObserver(OBS3);
subject.AddObserver(OBS4);
subject.AddObserver(OBS5);
// change the subjects values. The console window shows all 5 being updated
subject.Value1 = 1;
subject.Value2 = 2;
// remove Observers 3 and 4 from the list
subject.RemoveObserver(OBS3);
subject.RemoveObserver(OBS4);
// change the subjects values again. The console window shows the remaining observers being updated
subject.Value1 = 3;
subject.Value2 = 4;
}
static void Main(string[] args)
{
Subject subject = new Subject();
IObserver display = new Display();
IObserver dips1 = new DisplayNew();
subject.RegisterObserver(dips1);
subject.RegisterObserver(display);
subject.SetMeasurement((float)10.2, (float)11.2, (float)13.2);
subject.RemoveObserver(display);
subject.SetMeasurement((float)7.2, (float)8.2, (float)9.2);
}
static void Main(string[] args)
{
Subject subject = new Subject();
IObserver display = new Display();
IObserver dips1 = new DisplayNew();
subject.RegisterObserver(dips1);
subject.RegisterObserver(display);
subject.SetMeasurement((float)10.2, (float)11.2, (float)13.2);
subject.RemoveObserver(display);
subject.SetMeasurement((float)7.2, (float)8.2, (float)9.2);
}
/// <summary>
/// 移除订阅,可重写
/// </summary>
/// <param name="subject"></param>
/// <returns></returns>
public virtual bool RemoveSubject(Subject subject)
{
Subjects.Remove(subject);
return(subject.RemoveObserver(this));
}