枚举和常数。何时使用？ [英] Enums and Constants. Which to use when?

问题描述

我正在读取枚举，并发现它们非常类似于声明常量。我怎么知道什么时候使用常量而不是枚举，反之亦然。使用枚举有什么好处？

解决方案

使用枚举，当你想定义一些值可以是。颜色是一个明显的例子，如：

  public enum颜色
 {
白色，
红色，
蓝色
} 
  

或者也可能是一组可能的东西，如：
（示例我从 here 偷走，因为我很懒）

  [FlagsAttribute] 
枚举DistributedChannel 
 {
无= 0，
 Transacted = 1， 
 Queued = 2，
加密= 4，
 Persisted = 16，
 FaultTolerant = Transact |排队|持久化
} 
  

常量应为单个值，如PI。没有一个PI值范围，只有PI。

I was doing some reading on enums and find them very similar to declaring constants. How would I know when to use a constant rather than an enum or vice versa. What are some of the advantages of using enums?

解决方案

Use enums when you want to define a range of values that something can be. Colour is an obvious example like:

public enum Colour
{
    White,
    Red,
    Blue
}

Or maybe a set of possible things like: (Example I stole from here as I'm lazy)

[FlagsAttribute]
enum DistributedChannel
{
  None = 0,
  Transacted = 1,
  Queued = 2,
  Encrypted = 4,
  Persisted = 16,
  FaultTolerant = Transacted | Queued | Persisted
}

Constants should be for a single value, like PI. There isn't a range of PI values, there is just PI.

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