我怎样才能制作一个“抽象"?.NET 类库中的枚举? [英] How can I make an "abstract" enum in a .NET class library?

问题描述

我正在制作一个服务器库，其中的数据包关联是通过枚举完成的.

I'm making a server library in which the packet association is done by enum.

public enum ServerOperationCode : byte
{
    LoginResponse = 0x00,
    SelectionResponse = 0x01,
    BlahBlahResponse = 0x02
}

public enum ClientOperationCode : byte
{
    LoginRequest = 0x00,
    SelectionRequest = 0x01,
    BlahBlahRequest = 0x02
}

当您在自己的项目中工作时，这很好用 - 您可以比较返回的枚举成员(即 if (packet.OperationCode == ClientOperationCode.LoginRequest)).但是，由于这是一个类库，因此用户必须定义​​自己的枚举.

That works fine when you're working in your own project - you can compare which enum member is returned (i.e. if (packet.OperationCode == ClientOperationCode.LoginRequest)). However, since this is a class library, the user will have to define its own enum.

因此，我有两个枚举要添加为抽象"——ServerOperationCode 和 ClientOperationCode.我知道不可能在 C# 中实现抽象枚举.我该怎么做?

Therefore, I have two enums to add as "abstract" - ServerOperationCode and ClientOperationCode. I know it's not possible to implement abstract enums in C#. How would I go doing this?

推荐答案

当我需要这样做时，我喜欢在我的类上使用静态实例.它允许您拥有一些默认值，但也允许它通过通常的继承和接口实现方式进行扩展:

I like to use static instances on my classes when I need to do this. It allows you to have some default values but also lets it be extensible through the usual means of inheritance and interface implementations:

    public abstract class OperationCode
    {
        public byte Code { get; private set; }
        public OperationCode(byte code)
        {
            Code = code;
        }
    }

    public class ServerOperationCode : OperationCode
    {
        public static ServerOperationCode LoginResponse = new ServerOperationCode(0x00);
        public static ServerOperationCode SelectionResponse = new ServerOperationCode(0x01);
        public static ServerOperationCode BlahBlahResponse = new ServerOperationCode(0x02);

        public ServerOperationCode(byte code) : base(code) { }
    }

    public class ClientOperationCode : OperationCode
    {
        public static ClientOperationCode LoginRequest = new ClientOperationCode(0x00);
        public static ClientOperationCode SelectionRequest = new ClientOperationCode(0x01);
        public static ClientOperationCode BlahBlahRequest = new ClientOperationCode(0x02);

        public ClientOperationCode(byte code) : base(code) { }
    }

假设 packet.OperationCode 返回一个字节，您可能必须为字节实现 == 运算符.将此代码放入您的抽象 OperationCode 类中.

assuming packet.OperationCode return a byte, you will likely have to implement an == operator for byte. put this code into your abstract OperationCode class.

public static bool operator ==(OperationCode a, OperationCode b)
{
  return a.Code == b.Code;
}

public static bool operator !=(OperationCode a, OperationCode b)
{
  return !(a == b);
}

这将允许您拥有与您展示的相同的支票:

this will allow you to have the same check as you showed:

if (packet.OperationCode == ClientOperationCode.LoginRequest)

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