优化长的switch语句

突然想到之前碰到的一个优化的面试题，现在想想switch用的太傻

 public enum FormatType
 {
     GetKey,
     GetValue
 }
 public class Format
 {
     private static string Get(Dictionary<string, string> dict, FormatType formatType, string code)
     {
         if (formatType == FormatType.GetKey)
              return dict.FirstOrDefault(d => d.Value == code).Key;
         else
              return dict.FirstOrDefault(d => d.Key == code).Value;
     }
     public static string GetNation(FormatType formatType, string code)
     {
        Dictionary<string, string> dict = new Dictionary<string, string>{
                 {"","汉族"},
                 {"","藏族"},
                 {"","壮族"},
                 {"","朝鲜族"}
                 //这里省略其它......
         };
        return Get(dict, formatType, code);
    }
 }

使用：
获取"汉族"的编码
string key = Format.GetNation(FormatType.GetKey, "汉族");
获取"01"代表的民族
string value = Format.GetNation(FormatType.GetValue, "01");

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有的用委托有的用反射，这个讲的挺详细