如何在C＃中传递多个枚举值？

问题描述

有时，当读取他人的C＃代码时，我会看到一个方法可以在一个参数中接受多个枚举值。我一直认为这是一个整洁的，但从来没有看过。

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. 使用方法中的值
3. 
   
4. 定义枚举

以实现这种事情。

---

在我的特殊情况下，我想使用System.DayOfWeek，它定义为：

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。我可以使用这个特殊的枚举吗？如何做上面列出的3件事情？

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

定义枚举时，只需将其设置为[Flags]，设置值为2的权力，它将以这种方式工作。

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，没有其他更改。

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。

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

编辑响应添加的问题。

你将无法使用该枚举，除非你想做一些像pass它作为一个数组/ collection / params数组。这将让您传递多个值。标志语法需要将枚举指定为标志（或以不设计的方式来混合语言）。

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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