如果你有同一个类的不同实例,例如’FootballTeam’,你想让这个FootballTeam类的另一个实例知道发生了什么,那么最好的方法是什么？
事件不会真正起作用我猜…
例如：
- FootballTeam A = new FootballTeam();
- FootballTeam B = new FootballTeam();
- // now A needs to let B know about it's manager change
- // manager is a property inside this class...
解决方法
事件可能有效：
- FootballTeam A = new FootballTeam();
- FootballTeam B = new FootballTeam();
- A.ManagerChanged += B.OnOtherManagerChanged;
事件的定义 – 当Football Manager的Manager属性更改值时,它会调用其OnManagerChanged方法：
- class FootballTeam
- {
- public event EventHandler ManagerChanged;
- protected virtual void OnManagerChanged(EventArgs e)
- {
- EventHandler handler = ManagerChanged;
- if (handler != null)
- handler(this,e);
- }
- public void OnOtherManagerChanged(object sender,EventArgs e)
- {
- FootballTeam otherTeam = (FootballTeam) sender;
- // A manager changed on a different FootballTeam instance
- // ...do something here
- }
- }
