C# 类实例通讯

Question

例如，当您有同一类的不同实例时，例如“FootballTeam”，并且您想让此 FootballTeam 类的另一个实例知道发生了什么事解决这个问题的最佳方法是什么？

我猜事件不会真正起作用......

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

事件可以工作:

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

事件的定义——FootballTeam 在其 Manager 属性更改值时调用其 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
    }
}