瞭解枚舉

Question

我試圖找出枚舉是如何工作的，我試圖做一個函數來寫入註冊表，使用枚舉的註冊表的根，但也有點糊塗

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

問題是你試圖使用類初始化枚舉值，並使用枚舉值作爲類，這是你不能做的。從MSDN：

經批准的類型枚舉是字節，爲sbyte，短，USHORT，INT，UINT 長或ulong。

你可以做的是將枚舉作爲標準枚舉，然後根據枚舉返回正確的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); 
    }