EnumExtensions.cs

public static class EnumExtensions
{
    public static string GetEnumMemberValue<T>(this T type)
            where T : Enum
        {
            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)
            where T : Enum
        {
            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;
        }
}