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      VB.net 2010 視頻教程 VB.net 2010 視頻教程 VB.net 2010 視頻教程
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      • c#教程之類成員的存取控制

      • 2015-01-21 15:13 來源:未知

       類成員的存取控制(相關C#教程)
      一般希望類中一些數據不被隨意修改,只能按指定方法修改,既隱蔽一些數據。同樣一些函數也不希望被其它類程序調用,只能在類內部使用。如何解決這個問題呢?可用訪問權限控制字,常用的訪問權限控制字如下:private(私有)public(公有)。在數據成員或函數成員前增加訪問權限控制字,可以指定該數據成員或函數成員的訪問權限。

      私有數據成員只能被類內部的函數使用和修改,私有函數成員只能被類內部的其它函數調用。類的公有函數成員可以被類的外部程序調用,類的公有數據成員可以被類的外部程序直接使用修改。公有函數實際是一個類和外部通訊的接口,外部函數通過調用公有函數,按照預先設定好的方法修改類的私有成員。對于上述例子,name和age是私有數據成員,只能通過公有函數SetName()SetAge()修改,既它們只能按指定方法修改。
      這里再一次解釋一下封裝,它有兩個意義,第一是把數據和處理數據的方法同時定義在類中。第二是用訪問權限控制字使數據隱蔽。
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