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enum Language { Chinese = 0, English = 1 }

Language language = Language.Chinese;
将枚举转为字符串：
Convert.ToString(language);

将枚举转为整型：
Convert.ToInt32(language);

将字符串转为枚举：
Language language = (Language)Enum.Parse(typeof(Language), "Chinese");

将整型转为枚举：
Language language = (Language)Enum.Parse(typeof(Language), Convert.ToString(0));