使用属性来减少枚举枚举映射和枚举/常量行动开关statments [英] Using attributes to cut down on enum to enum mapping and enum/const to action switch statments

问题描述

我想大家都看过code，如：

I imagine everyone has seen code like:

public void Server2ClientEnumConvert( ServerEnum server)
{
    switch(server)
    {
       case ServerEnum.One:
           return ClientEnum.ABC
       //And so on.

这不是坏，我们可以做财产以后像：

Instead of this badness we could do somthing like:

public enum ServerEnum
{
     [Enum2Enum(ClientEnum.ABC)]
     One,
}

现在我们可以使用反射从枚举声明本身通过ServerEnum撕裂，并得到转换映射。

Now we can use reflection to rip through ServerEnum and get the conversion mappings from the enum declaration itself.

我有这里的问题是在Enum2Enum属性的声明。

The problem I am having here is in the declaration of the Enum2Enum attribute.

这工作，但替换对象o的枚举E不。我不希望能在对象传递给构造函数，只有其他枚举。

This works but replacing object o with Enum e does not. I do not want to be able to pass in objects to the constructor, only other enums.

public class EnumToEnumAttribute : Attribute
{
    public EnumToEnumAttribute(object o){}
}

这无法编译。

public class EnumToEnumAttribute : Attribute
{
    public EnumToEnumAttribute(Enum e){}
}

是否有编译错误的一个原因？我还能怎样传递中，除了地图所需的信息：

Is there a reason for the compile error? How else could I pass in the information needed to map besides:

EnumtoEnumAttribute(Type dest, string enumString)

这似乎过于冗长，但如果它是唯一的出路，然后我想我将使用它。

This seems too verbose but if it is the only way then I guess I will use it.

推荐答案

使用几乎相同的例子，你可以直接在枚举实现这一点：

Using almost the same example, you can achieve this directly in the enum:

public enum ServerEnum
{
   One = ClientEnum.ABC,
}

这已经不需要思考的好处，更易于阅读（在我看来），和总体需要更少的开销。

This has the benefit of not requiring Reflection, is easier to read (in my opinion), and overall requires less overhead.

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