Question

问题： 我可以用enum返回单个值enum.ToString()的字符串表示形式。在多值enum的情况下（例如：使用OR运算符|表示），我在enum.ToString()调用中得到的都是整数值，因为{ {1}}无法enum。

解决方法/障碍： 我无法在parse中创建多个具有相同值的实例，例如：

enum

因为这违反了标准，并且IDE对此感到非常皱眉。

问题示例：

public enum Languages: int
{
     English = 0, // From American English
     English = 1, // From UK English
     Spanish = 2, // From Castillian Spanish
     Spanish = 3, // From Latin American Spanish
     Portuguese = 4 // From Brasilian Portuguese
     Portuguese = 5, // From European Portuguese
}

期望（或我正在尝试做的事情）：

我期望条件应该匹配，所以public enum Languages: int { English = 0 | 1, // American or UK Spanish = 2 | 3, // Castillian or Latin American Portuguese = 4 | 5, // Brasil or Portugal MyMadeUpLanguage = 6, } int selectedLanguage = 1; Languages result = (Languages)Enum.Parse(typeof(Languages), selectedLanguage); string resultString = result.ToString(); // This is where '1' is returned and not English. int nextSelectedLanguage = 6; Languages differentResult = (Languages)Enum.Parse(typeof(Languages), nextSelectedLanguage); string nextResultString = differentResult.ToString(); // This returns 'MyMadeUpLanguage', as we would expect.或0会匹配1，然后我的枚举结果将是English，因此，返回的字符串将是Languages.English，而不是English。

相反，发生的似乎是对1 parse的调用只是返回为enum而不是int类型（参考上面的示例），因此-当然-Language方法将返回enum.ToString()。

对于多值int，如果从enum到2的值足以满足x <= int.MaxValue的要求，我该如何致电{{1} } enum成功转换为预期的parse（因此，将在返回enum方法时带回正确的字符串）？

Answer 1

我建议使用Flags属性，例如：

[Flags]
public enum Languages: int
{
     None = 0,                      // None 

     English    = 1 << 30,          // Languages  
     Spanish    = 1 << 29,  
     Portuguese = 1 << 28,   
     MyMadeUpLanguage = 1 << 27, 

                                    // Dialects
     EnglishUS = English | 1,       // From American English
     EnglishGB = English | 2,       // From UK English
     EnglishCA = English | 3,       // From Canada English
     SpanishES = Spanish | 1,       // From Castillian Spanish
     SpanishLA = Spanish | 2,       // From Latin American Spanish
     PortugueseBR = Portuguese | 1, // From Brasilian Portuguese
     PortuguesePT = Portuguese | 2, // From European Portuguese 

     MyMadeUpLanguageDialect1 = MyMadeUpLanguage | 1
}

典型比较：

Languages selectedLanguage ...

if (Languages.EnglishGB & Languages ==  Languages.EnglishGB) {
  // From Exactly English Great Britain
  ...
}

if (Languages.English & Languages == Languages.English) {
  // From some kind of English (Great Britain, or US dialect)
  ...
}

如何成功转换多值枚举？

1 个答案: