Enum的C＃显式初始化 [英] C# explicit initialization for Enum

问题描述

我有以下声明：

private Enum _statusValue;

我真正想说的是：

private Enum _statusValue = 0;

即使我知道这是多余的。只是我想明确指定初始化。

even though I know it's redundant. It's just that I like to explicitly specify the initialization.

但这是不允许的。

是否有一些简单的方法来指定这种声明的初始化？

Is there some simple way of specifying the initialization on this kind of declaration?

编辑-让我尝试再次。

这里是我正在做的人为设计/简化示例。

Here is a contrived / simplified example of what I'm doing.

using System;

namespace EnumTesting
{
   public enum EFixedPhoneUsability
   {
      UnknownValue,       // Should not occur?
      IsUsable,           // User is near the telephone
      NotUsable,          // User not near the telephone
      BeingUsed,          // Busy
      DoNotDisturb,       // This is phone physical state, not user attitude
      CallsForwarded      // This is phone physical state
   }

   public enum EMobilePhoneConnectivity
   {
      UnknownValue,       // Should not occur?
      OnNetIdle,          // I.e., usable
      OnNetBusy,          // Being used
      NoConnection        // Turned off, in elevator or tunnel or far from civilization
   }

   public class Program
   {
      public Enum StatusValue;

      static void Main(string[] args)
      {
         Program p = new Program();

         p.StatusValue = EMobilePhoneConnectivity.NoConnection;

         int i = (int) (EMobilePhoneConnectivity) p.StatusValue;

         p.StatusValue = EFixedPhoneUsability.DoNotDisturb;

         i = (int) (EFixedPhoneUsability) p.StatusValue;
      }
   }
}

所以我的问题是

      public Enum StatusValue;

第二编辑：

没关系，

How to convert from System.Enum to base integer?

关键词，其中让我意识到我做错了什么，是这样的：枚举是值类型（并且内部仅由整数常量表示），而System.Enum是引用类型。

The key phrase, which made me realize what I was doing wrong, is this: "enumerations are value types (and internally represented only by integer constants) while System.Enum is a reference type".

所以我不想这样说：

private Enum _statusValue = 0;

我要说的是，这是完全正确的：

I want to say this, which is perfectly valid:

private Enum _statusValue = null;

感谢那些尝试提供帮助的人。

Thank you to those who tried to help.

推荐答案

我的问题基本上是错误的。我曾经错误地认为Enum（像枚举）是一种值类型，但实际上是引用类型。

My question was basically in error. I had mistakenly thought Enum (like enums) was a value type, but it is actually a reference type.

所以我不想这么说：

private Enum _statusValue = 0; 

我要说的是，这是完全正确的：

I want to say this, which is perfectly valid:

private Enum _statusValue = null; 

感谢那些尝试提供帮助的人。

Thank you to those who tried to help.

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