C＃中的字符串枚举

debugcn 发表于 Dev

彼得汀

有这个课程：

public static class Command
{
    public const string SET_STB_MEDIA_CTRL = "SET STB MEDIA CTRL ";
    public static string ECHO = "ECHO";
    public static string SET_CHANNEL = "SET CHANNEL ";
    public static string GET_VOLUMN = "GET VOLUMN";
    public static string GET_MAX_VOLUMN = "GET MAX VOLUMN ";
    public string SET_STB_MEDIA_LIST = "SET STB MEDIA LIST ";
}

然后：

public static class MultimediaConstants
{
    public const string VIDEO = "video";
    public const string AUDIO = "audio";
    public const string PHOTO = "photo";
    public const string ALL = "all";
    public const string BACKGROUND_MUSIC = "background_music";
    public const string TV = "tv";
    public const string ACTION_PLAY = "play";
}

关键是，我想拥有这样的东西：

public static string SET_STB_MEDIA_CTRL (MultimediaConstants type,  MultimediaConstants action)
{
    return Command.SET_STB_MEDIA_CTRL + "type:" + type + "action:" + action;
}

因此，此方法的结果应为：

 SET STB MEDIA CTRL type:tv action:play

该方法的调用将是：

 SET_STB_MEDIA_CTRL (MultimediaConstants.TV, MultimediaConstants.ACTION_PLAY);

务实的

解决此类问题的方法是，所涉及的类具有私有构造函数，并具有使用该实例的值初始化的公共静态字段/属性。这是具有固定数量的该类型的不可变实例的一种方法，同时仍然允许方法接受该类型的参数。

以下代码是有效的C＃6.0。

public class Command
{
    private Command(string value)
    {
        Value = value;
    }

    public string Value { get; private set; }

    public static Command SET_STB_MEDIA_CTRL { get; } = new Command("SET STB MEDIA CTRL ");
    public static Command ECHO { get; } = new Command("ECHO");
    public static Command SET_CHANNEL { get; } = new Command("SET CHANNEL ");
    public static Command GET_VOLUMN { get; } = new Command("GET VOLUMN");
    public static Command GET_MAX_VOLUMN { get; } = new Command("GET MAX VOLUMN ");
    public static Command SET_STB_MEDIA_LIST { get; } = new Command("SET STB MEDIA LIST ");
}

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