EF 数据查询（更改默认排序）

数据实体对象

public class ProductInvLocationMapEntity:BaseDomain
    {
        #region Constructors

        public ProductInvLocationMapEntity()
        { }

        #endregion

        #region Properties
        /// <summary>
        /// 
        /// AllowNull: False
        /// Length: 8
        /// </summary>
        //public long Id { get; set; }

        /// <summary>
        /// 商品id
        /// AllowNull: False
        /// Length: 8
        /// </summary>
        public long ProductId { get; set; }

        /// <summary>
        /// 商品货号
        /// AllowNull: False
        /// Length: 50
        /// </summary>
        public string ProductCode { get; set; }

        /// <summary>
        /// 库位编号
        /// AllowNull: False
        /// Length: 50
        /// </summary>
        public string LocationLabel { get; set; }

        /// <summary>
        /// 库位类型
        /// AllowNull: False
        /// Length: 50
        /// </summary>
        public string LocationType { get; set; }

        /// <summary>
        /// 生产日期
        /// AllowNull: False
        /// Length: 8
        /// </summary>
        public DateTime ManufactureDate { get; set; }

        /// <summary>
        /// 已存放数量
        /// AllowNull: False
        /// Length: 4
        /// </summary>
        public int StoredQty { get; set; }

        



        #endregion

        #region override Mehtods

        public override string ToString()
        {
            return base.ToString();
        }

        #endregion

        /// <summary>
        /// 仓库Id
        /// </summary>
        public long WarehouseId { get; set; }
    }

数据操作方法

/// <summary>
        /// 
        /// </summary>
        /// <param name="product_id"></param>
        /// <param name="manufacture_date"></param>
        /// <returns></returns>
        public Models.EF6_Test.ProductInvLocationMapEntity GetMatchedLocationMap(long product_id,DateTime manufacture_date)
        {

            DateTime maxValue = new DateTime(9999, 12, 31, 23, 59, 59);
#if DEBUG
            this.OpenSqlRawOutput(Console.WriteLine);
#endif
            var matched_entity = this.EntrySet
                .OrderBy(obj=>obj.ModifiedTime)
                .FirstOrDefault(obj => (obj.ProductId == product_id && obj.ManufactureDate == manufacture_date) || (obj.ProductId == product_id && obj.ManufactureDate == maxValue));
            return matched_entity;
        }