private static void AddVersionColumn(Type type, ClassMap mapping, XElement e) { var version = new VersionAttribute(); var memberName = e.GetAttributeValue <string>("Member"); var member = type.GetMember(memberName).FirstOrDefault(); if (member == null) { throw new MappingException(string.Format("Invalid member:'{0}' in type '{1}'!", memberName, type.FullName)); } var storage = e.GetAttributeValue <string>("Storage"); if (storage.HasValue()) { version.Storage = storage; } version.Name = e.GetAttributeValue <string>("Name"); version.IsNullable = !e.GetAttributeValue <bool>("Required"); version.Length = e.GetAttributeValue <int>("Length"); var dbType = e.GetAttributeValue <string>("DbType"); if (dbType.HasValue()) { version.DbType = (DBType)Enum.Parse(typeof(DBType), dbType); } mapping.members.Add(member, version); }