如何在 C# 中传递多个枚举值? [英] How do you pass multiple enum values in C#?

问题描述

有时在阅读其他人的 C# 代码时，我看到一种方法可以在单个参数中接受多个枚举值.我一直认为它有点整洁，但从未仔细研究过.

Sometimes when reading others' C# code I see a method that will accept multiple enum values in a single parameter. I always thought it was kind of neat, but never looked into it.

嗯，现在我想我可能需要它，但不知道如何

Well, now I think I may have a need for it, but don't know how to

1. 设置方法签名以接受此
2. 处理方法中的值
3. 定义枚举

实现这种事情.

---

在我的特定情况下，我想使用 System.DayOfWeek，其定义为:

to achieve this sort of thing.

---

In my particular situation, I would like to use the System.DayOfWeek, which is defined as:

[Serializable]
[ComVisible(true)]
public enum DayOfWeek
{ 
    Sunday = 0,   
    Monday = 1,   
    Tuesday = 2,   
    Wednesday = 3,   
    Thursday = 4,   
    Friday = 5,    
    Saturday = 6
}

我希望能够将一个或多个 DayOfWeek 值传递给我的方法.我能按原样使用这个特定的枚举吗?我如何做上面列出的 3 件事?

I want to be able to pass one or more of the DayOfWeek values to my method. Will I be able to use this particular enum as it is? How do I do the 3 things listed above?

推荐答案

当你定义枚举时，只需用 [Flags] 属性，将值设置为 2 的幂，它就会这样工作.

When you define the enum, just attribute it with [Flags], set values to powers of two, and it will work this way.

除了将多个值传递给函数之外，没有其他任何变化.

Nothing else changes, other than passing multiple values into a function.

例如:

[Flags]
enum DaysOfWeek
{
   Sunday = 1,
   Monday = 2,
   Tuesday = 4,
   Wednesday = 8,
   Thursday = 16,
   Friday = 32,
   Saturday = 64
}

public void RunOnDays(DaysOfWeek days)
{
   bool isTuesdaySet = (days & DaysOfWeek.Tuesday) == DaysOfWeek.Tuesday;

   if (isTuesdaySet)
      //...
   // Do your work here..
}

public void CallMethodWithTuesdayAndThursday()
{
    this.RunOnDays(DaysOfWeek.Tuesday | DaysOfWeek.Thursday);
}

有关详细信息，请参阅 MSDN 关于枚举类型的文档.

For more details, see MSDN's documentation on Enumeration Types.

根据问题的补充进行编辑.

Edit in response to additions to question.

您将无法按原样使用该枚举，除非您想执行诸如将其作为数组/集合/参数数组传递之类的操作.那会让你传递多个值.标志语法要求将 Enum 指定为标志(或以非其设计的方式混杂该语言).

You won't be able to use that enum as is, unless you wanted to do something like pass it as an array/collection/params array. That would let you pass multiple values. The flags syntax requires the Enum to be specified as flags (or to bastardize the language in a way that's its not designed).

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