转换字符串值域枚举器的最有效方法是什么？

Question

I have a public entity contract to expos in my service but internally I have some differences. In this specific case I have a string value domain represented as an enumerator. The domain is the same in both public and internal scope, but the names used are different and I need to translate from one to another. First I thought to keep to the basics and use a simple switch, but then I thought using a mirror enumerator with the internal string values I need and then use it with a ToString() . Wich one is the most efficient way to do this stuff?

Enumerator

public enum PublicDomain {
    AAA = 0,
    BBB = 1,
    CCC = 2,
    DDD = 3
}

private enum InternalDomain {
    W = 0,
    X = 1,
    Y = 2,
    Z = 3
}

Keep to the basics

string stringValue = null;

switch (publicEnumValue)
{
    case PublicDomain.AAA:
        stringValue = "W";
        break;
    case PublicDomain.BBB:
        stringValue = "X";
        break;
    case PublicDomain.CCC:
        stringValue = "Y";
        break;
    case PublicDomain.DDD:
        stringValue = "Z";
        break;
}

foo(stringValue);

Enumerator > Enumerator > ToString()

private enum InternalDomain {
    W = 0,
    X = 1,
    Y = 2,
    Z = 3
}

foo(((InternalDomain)publicEnumValue).ToString());

Answer 1

I would not be concerned with "efficiency" but with maintainability.

I would have an extension to convert public enum to internal enum

static class PublicDomainExtensions
{
   public InternalDomain ToInternal(this PublicDomain e)
   {
      return (InternalDomain) e;
   }
 }

This way if InternalDomain or PublicDomain ever change, all you need to do is rewrite ToInternal .