test.cs

        public void Update(Article data)
        {
            var oldData = GetSingleData(data.Id);
            if (oldData != null)
            {

                Mapper.CreateMap<Article, Article>()
                    .ForMember(d => d.CreateTime, d => d.Ignore())
                    .ForMember(d => d.LastEditTime, d => d.UseValue(DateTime.UtcNow));

                //   oldData.Subject = data.Subject;
                oldData = Mapper.Map<Article>(data);

                Save();

            }
        }