c#类实例通信

Question

如果你有同一个类的不同实例,例如' FootballTeam',并且你想让这个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...

Answer 1

事件可以发挥作用：

FootballTeam A = new FootballTeam();
FootballTeam B = new FootballTeam();
A.ManagerChanged += B.OnOtherManagerChanged;

事件的定义——当其属性值更改时FootballTeam调用其OnManagerChanged方法：Manager

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
    }
}