c# linq update单个字段

1.更新单个字段

/// <summary>
        /// 更新字段
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="conditions">where 筛选对象</param>
        /// <param name="updateLamda">更新字段</param>
        /// <returns></returns>
        public IEnumerable<T> Update<T>( Expression<Func<T, bool>> conditions,Func<T, dynamic> updateLamda) where T : ModelBase
        {            
            List<T> setList;
            if (conditions!=null)
            {
                setList= this.Set<T>().Where(conditions).ToList();
            }
            else
            {
                setList = this.Set<T>().ToList();
            }
            foreach (var item in setList)
            {
                SetValue<T>(item, updateLamda);
                this.Entry<T>(item).State = EntityState.Modified;
            }
            this.SaveChanges();
            return setList;
        }

        public dynamic SetValue<T>(T entity, Func<T, dynamic> expr)
        {
            return expr(entity);
        }

更新单个字段