从长期事件源取消订阅窗体组件-何时?

interface ITranslationProvider 
{
    string GetTranslation(string key);
    event LanguageChangedEvent LanguageChanged;
}

ie:语言在运行时可以更改,组件需要通过更新显示字符串来响应。

什么时候是退订的正确时间 LanguageChanged 事件?

例如,它似乎覆盖了 Disposing() 应该工作:

class MyPanel : System.Windows.Forms.Panel 
{
    public MyPanel(ITranslationProvider translator) 
    {
        this.translator = translator;
        translator.LanguageChanged += new LanguageChangedEvent(SetText);
        SetText();
    }

    protected override void Dispose(bool disposing) 
    {
        base.Dispose(disposing);

        // is this the correct place to unregister? will Dispose() get 
        // called on this panel, even though the translator's event has 
        // a reference to it?
        translator.LanguageChanged -= new LanguageChangedEvent(SetText);
    }

    private void SetText() 
    {
        this.Text = translator.GetTranslation("my.panel.text");
    }

    private ITranslationProvider translator;
}