C＃中：如果一个枚举的默认值是无或未知？ [英] C#: Should the default value of an enum be None or Unknown?

问题描述

假设你有一个代表错误代码的枚举。会有几个码，每个都有自己的基本int值;然而，得到默认值0枚举值似乎应该慎重考虑。

Say you have an enum that represents an error code. There will be several codes, each with their own underlying int value; however, the enum value that gets the default 0 value seems like it should be carefully considered.

在一个错误代码枚举的情况下，有两个特殊值，我能想到的：无（对于情况下，当没有错误）和未知（对于情况下，当没有现有的错误代码是适当的，或者即使当不能检测错误状态）

In the case of an error code enum, there are two special values that I can think of: None (for cases when there is no error) and Unknown (for cases when no existing error code is appropriate, or perhaps even when error state cannot be detected).

其中的一个值似乎应该得到0，其中其他可能会得到其他的东西像-1。它是更适合于无值设置为0，或未知的值设置为0？

One of these values seems like it should get 0, where the other will probably get something else like -1. Is it more appropriate to set the None value to 0, or the Unknown value to 0?

public enum ErrorCode
{
    None = -1,
    Unknown = 0,
    InsufficientPermissions,
    ConnectivityError,
    ...
}

public enum ErrorCode
{
    Unknown = -1,
    None = 0,
    InsufficientPermissions,
    ConnectivityError,
    ...
}

我的直觉告诉我，默认的应该是未知的，但我很好奇，如果任何人有不同的做到了

My instinct tells me that the default should be Unknown, but I'm curious if anyone has done it differently.

推荐答案

绝对不是一个好的做法。但是，如果没有其他办法...那么我会一般由第二个选项去：

Definitely not a good practice. But if there is no other way...then I would generally go by the second option:

public enum ErrorCode 
{ 
    Unknown = -1, 
    None = 0, 
    InsufficientPermissions, 
    ConnectivityError, 
    ... 
} 

由公约没有错误和-1顺利进入细跟，有一些错误（这可能是未知的理解）。

0 goes well by the convention 'No Error' and -1 goes fine with the understanding that there is some error (which may be unknown).

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