赋值的时候报错，怎么解决，这个字段并不是表中的字段，只是定义了个参数存其他值

using System;
using System.Data;
using ZGHT.DataAccess;

namespace BC.Data
{
    /// <summary>
    /// 行程路线表
    /// </summary>
    public class DT_TripLine : CEntityTable (CEntityTable是继承了DataTable)
    {
        public DT_TripLine() { this.BuildTable(); }
        #region Model


        /// <summary>
        /// 主键 
        /// </summary>
        public decimal pID
        {
            get { return GetDecimal("ID"); }
            set { SetProperty("ID", value); }
        }

        
       
        /// <summary>
        /// 包车起点
        /// </summary>

        public string pOrigAddr
        {
            get { return GetString("OrigAddr"); }
            set { SetProperty("OrigAddr", value); }
        }
        /// <summary>
        /// 包车终点
        /// </summary>

        public string pDestAddr
        {
            get { return GetString("DestAddr"); }
            set { SetProperty("DestAddr", value); }
        }

        /// <summary>
        /// 包车途经地
        /// </summary>

        public string pMainAddr
        {
            get { return GetString("MainAddr"); }
            set { SetProperty("MainAddr", value); }
        }
       
        /// <summary>
        /// 路线名称
        /// </summary>
        public string pTripName
        {
            get { return GetString("TripName"); }
            set { SetProperty("TripName", value); }
        }
        /// <summary>
        ///需求发布者类型(1-旅行社/2-个人/3-运维中心)
        /// </summary>
        public string pPublisherType
        {
            get { return GetString("PublisherType"); }
            set { SetProperty("PublisherType", value); }
        }
        /// <summary>
        /// 需求发布者ID
        /// </summary>

        public decimal pPublisherID
        {
            get { return GetDecimal("PublisherID"); }
            set { SetProperty("PublisherID", value); }
        }
        /// <summary>
        /// 里程
        /// </summary>

        public decimal pOPERKILOMETRES
        {
            get { return GetDecimal("OPERKILOMETRES"); }
            set { SetProperty("OPERKILOMETRES", value); }
        }

        /// <summary>
        ///需求发布者类型(1-旅行社/2-个人/3-运维中心)
        /// </summary>
        public string pBcLevel
        {
            get { return GetString("BcLevel"); }
            set { SetProperty("BcLevel", value); }
        }

        /// <summary>
        ///开始点经纬度坐标
        /// </summary>
        public string startPosition { get ; set ; }

        /// <summary>
        ///终点经纬度坐标
        /// </summary>
        public string endPosition { get; set; }

        /// <summary>
        ///途经点点经纬度坐标
        /// </summary>
        public string passPosition { get ; set ; }

        /// <summary>
        ///驾车策略
        /// </summary>
        public string drivStrategy { get; set; }

        /// <summary>
        ///途经点名称
        /// </summary>
        public string passName { get; set; }

        #endregion Model
        private void BuildTable()
        {
            this.TableName = "T_TripLine";
            DataColumn column = null;

            column = new DataColumn("ID", typeof(System.Decimal));
            this.Columns.Add(column);
            
            column = new DataColumn("OrigAddr", typeof(System.String));
            this.Columns.Add(column);

            column = new DataColumn("DestAddr", typeof(System.String));
            this.Columns.Add(column);

            column = new DataColumn("MainAddr", typeof(System.String));
            this.Columns.Add(column);

           
            column = new DataColumn("TripName", typeof(System.String));
            this.Columns.Add(column);

            column = new DataColumn("PublisherType", typeof(System.String));
            this.Columns.Add(column);

            column = new DataColumn("PublisherID", typeof(System.Decimal));
            this.Columns.Add(column);

            column = new DataColumn("OPERKILOMETRES", typeof(System.Decimal));
            this.Columns.Add(column);

            column = new DataColumn("BcLevel", typeof(System.String));
            this.Columns.Add(column);

            this.MainKey = new DataColumn[] { this.Columns["ID"] };
        }
    }
}