在字节大小枚举 [英] Enum Size in Bytes

问题描述

什么是以下枚举字节大小？

what is the size of below enum in bytes?

public enum MMTPCnxNckRsn 
{
    MMTPCnxNckRsnNoAnswer = -2, 
    MMTPCnxNckRsnSendError = -1, 
    MMTPCnxNckRsnOk = 0, 
    MMTPCnxNckRsnInvalidMember = 1, 
    MMTPCnxNckRsnHubNotReady = 2, 
    MMTPCnxNckRsnUnknownMember = 3, 
    MMTPCnxNckRsnLastCnxTooRecent = 4, 
    MMTPCnxNckRsnInvalidVersion = 5, 
    MMTPCnxNckRsnInvalidOptions = 6, 
    MMTPCnxNckRsnTooManyCnx = 7 
};

我用下面的代码来找到它，但我认为这是不enough..It是10 elements..Should一个字符串数组我在每一个元素算个字符，假设每个字符1个字节，并添加元素的所有字节？怎么样无符号数???

I've used the code below to find it but I think it is not enough..It is an string array with 10 elements..Should I count the chars in each element , assume each char 1 byte and add all bytes of elements? what about unsigned numbers???

var size = Enum.GetNames(typeof(MMTPCnxNckRsn)).Length;
var arr = Enum.GetNames(typeof (MMTPCnxNckRsn));

我不知道，如果它一提的是我在<$ C的中间是非常重要的$ C>编组 A机Win32代码，C＃和关键的是要找到枚举在内存管理地址的大小。

I'm not sure if it is important to mention that I am in the middle of marshaling a native win32 code to c#, and it is CRUCIAL to find the size of the enum for managing addresses in memory.

推荐答案

借助文档说：

默认基础类型的枚举元素是int型。

The default underlying type of enumeration elements is int.

因此，你的数据类型将有4个字节的大小，这是一个int的大小
您可以用下面的命令证实了这一点：

Therefore, your data type will have the size of 4 bytes, which is the size of an int.
You can confirm this by using the following command:

Marshal.SizeOf(Enum.GetUnderlyingType(typeof(MMTPCnxNckRsn)));

虽然你使用的名称是指在源代码中的枚举值，它们的代码来表示的运行本机作为整数值上。因此你对字符串数组的评论是很离谱的。

Whilst you refer to the enum values in source code using a name, they are represented in the code that runs on the machine as integer values. So your comment about string arrays is quite wide of the mark.

我也认为你是在思维大小的问题。看着你最近的其他问题，你似乎是一个翻译C ++结构，C＃进行的PInvoke。那么，C＃枚举将直接映射到C ++枚举。该PInvoke的编组看起来大小后，奠定他们为你。你并不需要处理明确。

I also think you are over-thinking the issue of size. Looking at your other recent question, you seem to be translating a C++ structure to C# for pinvoke. Well, the C# enum will map straight onto the C++ enum. The pinvoke marshaller will look after the sizes and lay them out for you. You do not need to handle that explicitly.

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