EF-按字段读取



        /// <summary>

        /// 直接获取特定一个或者多个字段的值

        /// 多个字段需要声明Model

        /// var s=  testDal.GetScalar<dynamic>(m=>m.Code== "02018",m=>new { m.Name,m.Code });

        /// var a = s.Name;

        /// </summary>

        /// <typeparam name="T"></typeparam>

        /// <param name="predicate"></param>

        /// <param name="scalar"></param>

        /// <returns></returns>

        public T GetScalar<T>(Expression<Func<TEntity, bool>> predicate, Expression<Func<TEntity, T>> scalar)

        {

            if (predicate == null)

            {

                return dbcontext.Set<TEntity>().AsNoTracking().Select(scalar).FirstOrDefault();

            }

            else

            {

                return dbcontext.Set<TEntity>().AsNoTracking().Where(predicate).Select(scalar).FirstOrDefault();

            }

        }
巴特西

EF-按字段读取

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