c# How to get enum from custom attribute? [duplicate]

Question

This is 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
....

}

How can I, get the enum with a specific CountryCodeAttr? for example from attribute Currency?

Answer 1

You need to get it from the enum type:

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

Answer 2

There is another method to do this with generics:

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;
}