从 C# 中的枚举获取 int 值

问题描述：

我有一个名为Questions(复数)的课程.在这个类中有一个名为 Question(单数)的枚举，它看起来像这样.

I have a class called Questions (plural). In this class there is an enum called Question (singular) which looks like this.

public enum Question
{
    Role = 2,
    ProjectFunding = 3,
    TotalEmployee = 4,
    NumberOfServers = 5,
    TopBusinessConcern = 6
}

在 Questions 类中，我有一个 get(int foo) 函数，它返回一个 Questions 对象 foo代码>.有没有一种简单的方法可以从枚举中获取整数值，以便我可以执行这样的操作 Questions.Get(Question.Role)?

In the Questions class I have a get(int foo) function that returns a Questions object for that foo. Is there an easy way to get the integer value off the enum so I can do something like this Questions.Get(Question.Role)?

答

只需投射枚举，例如

int something = (int) Question.Role;

以上适用于您在野外看到的绝大多数枚举，因为枚举的默认基础类型是 int.

The above will work for the vast majority of enums you see in the wild, as the default underlying type for an enum is int.

然而，正如 cecilphillip 指出的那样，枚举可以有不同的基础类型.如果枚举被声明为 uint、long 或 ulong，则应将其强制转换为枚举的类型；例如对于

However, as cecilphillip points out, enums can have different underlying types. If an enum is declared as a uint, long, or ulong, it should be cast to the type of the enum; e.g. for

enum StarsInMilkyWay:long {Sun = 1, V645Centauri = 2 .. Wolf424B = 2147483649};

你应该使用

long something = (long)StarsInMilkyWay.Wolf424B;

从 C# 中的枚举获取 int 值

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