接口/基类C＃枚举？ [英] C# enum in interface/base class?

问题描述

我有枚举问题

我需要做的基类或接口（但空单）一个枚举

I need make a enum in base class or interface (but empty one)

class Base 
{
   public enum Test;
   // ???
}

和后做出不同势枚举

class Parent1
{
   public enum Test {A, B, C};
}

class Parent2
{
   public enum Test {J, H, K};
}

现在我有方法下一堂课时，我不得不使用枚举

and now i have next class with method when i have to use enum

class Test<T>
{
   public void Foo(Test enum)
   {
      int value = (int) enum;
      // ...
   }
}

它的存在没有办法做这样的事情？

It's there any way to do something like that ?

如果没有我在每一个类...

If not i have to use static ints in every class ...

class Parent1
{
   public static int A = 0;
   public static int B = 5;
   public static int C = 7;
}

class Parent2
{
   public static int J = 1;
   public static int H = 3;
   public static int K = 6;
}

class Test<T>
{
   public void Foo(int enum)
   {
      int value = enum;
      // ...
   }
}

我ŧ很糟糕的代码......在一些班级我必须使用20〜+变量

I't looks bad in code ... in some classes i have to use ~20+ variables

推荐答案

有没有这样的事情一个抽象的枚举（即可以在子类中不同的实现） - 但泛型可能是一种选择：

There is no such thing as an abstract enum (that can have different implementations in subclasses) - but generics may be an option:

class Base<T> where T : struct {
    private T value;
    public void Foo(T value) {
        this.value = value;
    }
}
class Parent1 : Base<Parent1.Enum1> {
    public enum Enum1 {A, B, C};
}
class Parent2 : Base<Parent2.Enum2> {
    public enum Enum2 { J, H, K };
}

唯一的问题是，这并不强制执行，只有枚举是可用的 - 你可以在运行时做到这一点，虽然 - 在类型初始化例如：

The only problem is that this doesn't enforce that only enums are usable - you can do this at runtime, though - for example in a type initializer:

static Base() {
    if (!typeof(T).IsEnum) throw new InvalidOperationException(
         typeof(T).Name + " is not an enum");
}

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