linq結果セットをdatatableに変換

    public static class Ext

    {

        public static DataTable ConvertToTable(this IEnumerable<ListEntity> obj)

        {

            if (obj == null) return null;

            var ret = new DataTable();

            ret.Columns.Add("id", typeof(ListEntity).GetField("id").FieldType);

            ret.Columns.Add("Fmsn", typeof(ListEntity).GetField("Fmsn").FieldType);

            ret.Columns.Add("State", typeof(ListEntity).GetField("State").FieldType);

            ret.Columns.Add("CardSerialNum", typeof(ListEntity).GetField("CardSerialNum").FieldType);

            ret.Columns.Add("CerGetDate", typeof(ListEntity).GetField("CerGetDate").FieldType);

            ret.Columns.Add("CerEndDate", typeof(ListEntity).GetField("CerEndDate").FieldType);

            ret.Columns.Add("OrgSn", typeof(ListEntity).GetField("OrgSn").FieldType);

            ret.Columns.Add("OrgCode", typeof(ListEntity).GetField("OrgCode").FieldType);

            ret.Columns.Add("OrgName", typeof(ListEntity).GetField("OrgName").FieldType);

            ret.Columns.Add("FmName", typeof(ListEntity).GetField("FmName").FieldType);

            foreach (var item in obj)

            {

                DataRow r = ret.NewRow();

                r["id"] = item.id;

                r["Fmsn"] = item.Fmsn;

                r["State"] = item.State;

                r["CardSerialNum"] = item.CardSerialNum;

                r["CerGetDate"] = item.CerGetDate;

                r["CerEndDate"] = item.CerEndDate;

                r["OrgSn"] = item.OrgSn;

                r["OrgCode"] = item.OrgCode;

                r["OrgName"] = item.OrgName;

                r["FmName"] = item.FmName;

                ret.Rows.Add(r);

            }

            return ret;

        }

    }

[Serializable]

    [DataContract]

    public class ListEntity

    {

        [DataMember]

        public int id { get; set; }



        [DataMember]

        public string Fmsn { get; set; }



        [DataMember]

        public int State { get; set; }



        [DataMember]

        public string CardSerialNum { get; set; }



        [DataMember]

        public System.Nullable<System.DateTime> CerGetDate { get; set; }



        [DataMember]

        public System.Nullable<System.DateTime> CerEndDate { get; set; }



        [DataMember]

        public string OrgSn { get; set; }



        [DataMember]

        public string OrgCode { get; set; }



        [DataMember]

        public string OrgName { get; set; }



        [DataMember]

        public string FmName { get; set; }

    }