c# - 了解枚举

Question

我试图弄清楚枚举是如何工作的，我试图创建一个函数来写入注册表，使用枚举作为注册表的根目录，但有点困惑

public enum RegistryLocation
        {
            ClassesRoot = Registry.ClassesRoot,
            CurrentUser = Registry.CurrentUser,
            LocalMachine = Registry.LocalMachine,
            Users = Registry.Users,
            CurrentConfig = Registry.CurrentConfig
        }

public void RegistryWrite(RegistryLocation location, string path, string keyname, string value)
{
     // Here I want to do something like this, so it uses the value from the enum
     RegistryKey key;
     key = location.CreateSubKey(path);
     // so that it basically sets Registry.CurrentConfig for example, or am i doing it wrong
     ..
}

Answer 1

问题是您正在尝试使用类初始化枚举值并将枚举值用作类，这是您无法做到的。来自MSDN：

已批准的枚举类型为 byte、sbyte、short、ushort、int、uint、long 或 ulong。

您可以做的是将枚举作为标准枚举，然后让方法根据枚举返回正确的 RegistryKey。

例如：

    public enum RegistryLocation
    {
        ClassesRoot,
        CurrentUser,
        LocalMachine,
        Users,
        CurrentConfig
    }

    public RegistryKey GetRegistryLocation(RegistryLocation location)
    {
        switch (location)
        {
            case RegistryLocation.ClassesRoot:
                return Registry.ClassesRoot;

            case RegistryLocation.CurrentUser:
                return Registry.CurrentUser;

            case RegistryLocation.LocalMachine:
                return Registry.LocalMachine;

            case RegistryLocation.Users:
                return Registry.Users;

            case RegistryLocation.CurrentConfig:
                return Registry.CurrentConfig;

            default:
                return null;

        }
    }

    public void RegistryWrite(RegistryLocation location, string path, string keyname, string value) {
         RegistryKey key;
         key = GetRegistryLocation(location).CreateSubKey(path);
    }