c＃如何從自定義屬性獲取枚舉？

Question

這是MyEnum

public class CountryCodeAttr : EnumAttr 
{ 
    public string Code { get; set; } 
    public string Description { get; set; } 
} 

public enum CountryCode 
{ 
    [CountryCodeAttr(Code = "Unknown", Description = "Unknown")] 
    Unknown, 
    [CountryCodeAttr(Code = "CH", Description = "Swiss", Currency="CHF")] 
    CH 
.... 

} 

我怎樣才能，獲得與特定CountryCodeAttr枚舉？例如從屬性Currency？

Answer 1

您需要從枚舉類型得到它：

CountryCode value = CountryCode.CH; 
FieldInfo field = typeof(CountryCode).GetField(value.ToString()); 
var attr = field.GetCustomAttribute<CountryCodeAttr>(); 

Answer 2

有泛型做到這一點的另一種方法：

public static T GetAttribute<T>(Enum enumValue) where T: Attribute 
{ 
    T attribute; 

    MemberInfo memberInfo = enumValue.GetType().GetMember(enumValue.ToString()) 
            .FirstOrDefault(); 

    if (memberInfo != null) 
    { 
     attribute = (T) memberInfo.GetCustomAttributes(typeof (T), false).FirstOrDefault(); 
     return attribute; 
    } 
    return null; 
}