using System;

using System.Linq;

using System.Runtime.Serialization;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(DuvodEnum.Dovolena.ToEnumString());

        Console.WriteLine(DuvodEnum.Nemoc.ToEnumString());

        Console.WriteLine(DuvodEnum.VolnyPatek.ToEnumString());

        Console.WriteLine("1".ToEnum<DuvodEnum>());

        Console.WriteLine("2".ToEnum<DuvodEnum>());

        Console.WriteLine("P".ToEnum<DuvodEnum>());

    }

}

​

public enum DuvodEnum 

{

    [EnumMember(Value = "1")]

    Dovolena,

    [EnumMember(Value = "2")]

    Nemoc,

    [EnumMember(Value = "P")]

    VolnyPatek

}

​

public static class Extensions {

    public static string ToEnumString<T>(this T type)

    {

        var enumType = typeof (T);

        var name = Enum.GetName(enumType, type);

        var enumMemberAttribute = ((EnumMemberAttribute[])enumType.GetField(name).GetCustomAttributes(typeof(EnumMemberAttribute), true)).Single();

        return enumMemberAttribute.Value;

    }

​

    public static T ToEnum<T>(this string str)

    {

        var enumType = typeof(T);

        foreach (var name in Enum.GetNames(enumType))

        {

            var enumMemberAttribute = ((EnumMemberAttribute[])enumType.GetField(name).GetCustomAttributes(typeof(EnumMemberAttribute), true)).Single();

            if (enumMemberAttribute.Value == str) return (T)Enum.Parse(enumType, name);

        }

​

        return default(T);

    }

}