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                # Compiler Error CS0151 應輸入整型值 在需要整型數據類型的情況中使用了變量。有關更多信息,請參見[類型(C# 編程指南)](https://msdn.microsoft.com/zh-cn/library/ms173104.aspx)。 當沒有轉換或者可用的隱式轉換導致了不明確的情形時,會出現此錯誤。下面的示例生成 CS0151。 ``` // CS0151.cs public class MyClass { public static implicit operator int (MyClass aa) { return 0; } public static implicit operator long (MyClass aa) { return 0; } public static void Main() { MyClass a = new MyClass(); // Compiler cannot choose between int and long switch (a) // CS0151 // try the following line instead // switch ((int)a) { case 1: break; } } } ``` 在 Visual Studio 2008 及更高版本中,[void](https://msdn.microsoft.com/zh-cn/library/yah0tteb.aspx) 方法調用會生成 CS0151。通過調用返回整數類型(如 [int](https://msdn.microsoft.com/zh-cn/library/5kzh1b5w.aspx) 或 [long](https://msdn.microsoft.com/zh-cn/library/ctetwysk.aspx))的方法可以修復該錯誤。 ``` class C { static void Main() { switch (M()) // CS0151 { default: break; } } static void M() { } } ```
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