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                # value(C# 參考) 上下文關鍵字 **value** 用在普通屬性聲明的 set 訪問器中。此關鍵字類似于方法的輸入參數。關鍵字 **value** 引用客戶端代碼嘗試賦給屬性的值。在下面的示例中,MyDerivedClass 有一個名為 Name 的屬性,該屬性使用 **value** 參數向支持字段 name 分配新字符串。從客戶端代碼的角度來看,該操作寫作一個簡單的賦值語句。 ``` class MyBaseClass { // virtual auto-implemented property. Overrides can only // provide specialized behavior if they implement get and set accessors. public virtual string Name { get; set; } // ordinary virtual property with backing field private int num; public virtual int Number { get { return num; } set { num = value; } } } class MyDerivedClass : MyBaseClass { private string name; // Override auto-implemented property with ordinary property // to provide specialized accessor behavior. public override string Name { get { return name; } set { if (value != String.Empty) { name = value; } else { name = "Unknown"; } } } } ``` 有關使用 **value** 的更多信息,請參見[屬性(C# 編程指南)](https://msdn.microsoft.com/zh-CN/library/x9fsa0sw.aspx)。 ## C# 語言規范 有關詳細信息,請參閱 [C# 語言規范](https://msdn.microsoft.com/zh-CN/library/ms228593.aspx)。該語言規范是 C# 語法和用法的權威資料。 ## 請參閱 [C# 參考](https://msdn.microsoft.com/zh-CN/library/618ayhy6.aspx) [C# 編程指南](https://msdn.microsoft.com/zh-CN/library/67ef8sbd.aspx) [C# 關鍵字](https://msdn.microsoft.com/zh-CN/library/x53a06bb.aspx)
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