C＃枚举是否类型安全？ [英] Are C# enums typesafe?

问题描述

C＃枚举类型是否安全？

Are C# enums typesafe?

如果不是什么意思？

推荐答案

给出一个稍微不同的答案，而从铸造角度来看，这些值是类型安全的，它们仍然未被选中一旦他们被投了 - 即

To give a slightly different answer... while the values are type-safe from the casting perspective, they are still unchecked once they have been cast - i.e.

enum Foo { A = 1, B = 2, C = 3 }    
static void Main()
{
    Foo foo = (Foo)500; // works fine
    Console.WriteLine(foo); // also fine - shows 500
}

因此，您应该注意检查值 - 例如在开关中的默认值中引发异常。

For this reason, you should take care to check the values - for example with a default in a switch that throws an exception.

您还可以通过以下方式检查（对于非 [Flags] 值）：

bool isValid = Enum.IsDefined(typeof(Foo), foo);

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