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                # Compiler Error CS0134 “variable”的類型為“type”。只能用 null 對引用類型(字符串除外)的常量字段進行初始化。 常量表達式是可在編譯時可完全計算的表達式。由于應用 new 運算符是創建引用類型的非空值的唯一方法,并且常量表達式中不允許使用 new 運算符,因此除字符串外,引用類型常量的唯一可能值為 null。 如果嘗試創建 [const](https://msdn.microsoft.com/zh-cn/library/e6w8fe1b.aspx) 字符串數組時遇到此錯誤,則解決方案是使該數組成為[只讀](https://msdn.microsoft.com/zh-cn/library/acdd6hb7.aspx)數組,并在構造函數中將其初始化。 下面的示例生成 CS0134。 ``` // CS0134.cs // compile with: /target:library class MyTest {} class MyClass { const MyTest test = new MyTest(); // CS0134 //OK const MyTest test2 = null; const System.String test3 = "test"; } ```
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