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                # add(C# 參考) **add** 上下文關鍵字用于定義一個自定義事件訪問器,當客戶端代碼訂閱您的[事件](https://msdn.microsoft.com/zh-cn/library/8627sbea.aspx)時將調用該訪問器。如果提供自定義 **add** 訪問器,還必須提供 [remove](https://msdn.microsoft.com/zh-cn/library/cc713642.aspx) 訪問器。 下面的示例演示一個具有自定義 **add** 和 [remove](https://msdn.microsoft.com/zh-cn/library/cc713642.aspx) 訪問器的事件。有關完整的示例,請參見[如何:實現接口事件(C# 編程指南)](https://msdn.microsoft.com/zh-cn/library/ak9w5846.aspx)。 ``` class Events : IDrawingObject { event EventHandler PreDrawEvent; event EventHandler IDrawingObject.OnDraw { add { lock (PreDrawEvent) { PreDrawEvent += value; } } remove { lock (PreDrawEvent) { PreDrawEvent -= value; } } } } ``` 通常不需要提供自己的自定義事件訪問器。在大多數情況下,使用在聲明事件時由編譯器自動生成的訪問器就足夠了。 ## 請參閱 [事件(C# 編程指南)](https://msdn.microsoft.com/zh-cn/library/awbftdfh.aspx)
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