[解決済み] EF: テキストデータ型は比較できないため、DISTINCT として選択できません。

質問事項

SQL Server テーブルに "text" 型のカラムがあるため、このエラーが発生しました。

The text data type cannot be selected as DISTINCT because it is not comparable

データ型を変更せずに解決する方法はありますか？

以下は私のlinq文です（長いです）。

                var query = (from s in db.tblSuppliers
                             join p in
                                 (
                                    from p1 in db.tblSupplierPricingSchemes
                                    select new
                                    {
                                        p1.SupplierID,
                                        p1.PSLangPairID,
                                        p1.CustomerID,
                                        p1.PSLanguageStatus,
                                        p1.PSPriceBasis,
                                        p1.PSMinFlatCharge,
                                        p1.PSTrxPrf,
                                        p1.PSNoMatch,
                                        p1.PSFuzzy,
                                        p1.PS100Match_Rep,
                                        p1.PSTrxOnly,
                                        p1.PSPrfOnly,
                                        p1.PSLinquisticHourlyRate,
                                        p1.PSDTPType,
                                        p1.PSDTPRate,
                                        p1.PS_FZ50,
                                        p1.PS_FZ75,
                                        p1.PS_FZ85,
                                        p1.PS_FZ95,
                                        p1.PS_FZ100,
                                        p1.PS_FZREPS,
                                        p1.PSPerfectMatch
                                    }
                                 ) on s.SupplierID equals p.SupplierID
                             join p2 in
                                 (
                                        from p in db.tblSupplierPricingSchemes
                                        where custID.Contains(p.CustomerID) && p.PSLangPairID == languagePairID
                                        group p by new { p.SupplierID, p.PSLangPairID, p.PSPriceBasis } into g
                                        let CustomerID = g.Max(uh => uh.CustomerID)
                                        select new
                                        {
                                            g.Key.SupplierID,
                                            g.Key.PSLangPairID,
                                            g.Key.PSPriceBasis,
                                            CustomerID
                                        }
                                 ) on p.SupplierID equals p2.SupplierID
                             join b in db.tblPricingBasis on p.PSPriceBasis equals b.PricingBasisID
                             join ss in db.tblSupplierStatus on p.PSLanguageStatus equals ss.SupplierStatusID into g1
                             from ss in g1.DefaultIfEmpty()
                             join l in db.tblLangPairs on p.PSLangPairID equals l.ProductID
                             where l.ProductID == languagePairID
                                && p.PSLangPairID == p2.PSLangPairID
                                && p.CustomerID == p2.CustomerID
                                && p.PSPriceBasis == p2.PSPriceBasis
                             select new PreferredSupplier
                             {
                                 SupplierID = s.SupplierID,
                                 //SupplierName = s.CompanyName != null ? s.CompanyName + "-" + s.SupplierFirstName + " " + s.SupplierLastName
                                 //                                     : s.SupplierFirstName + " " + s.SupplierLastName,

                                 SupplierName = s.CompanyName != null
                                            ? s.SupplierFirstName != null || s.SupplierLastName != null
                                                    ? s.CompanyName + "-" + s.SupplierFirstName + " " + s.SupplierLastName
                                                    : s.CompanyName
                                            : s.SupplierFirstName + " " + s.SupplierLastName,

                                 CompanyName = s.CompanyName,
                                 SupplierFirstName = s.SupplierFirstName,
                                 SupplierLastName = s.SupplierLastName,

                                 SupplierStatus = p.CustomerID == customerID ? "Team Member" : ss.SupplierStatus,
                                 Email = (string)s.SupplierEmails,

                                 Rate = (s.VolumeDiscountType == 1 ? // Percentage
                                     //if the volume discount is as percentage then get the rate and multiple it by 1 - the discount percentage
                                        ((words > s.VolumeDiscountAmount && (task == "TM No Match" || task == "Translation/Proofreading")) ? 1 - s.VolumeDiscountValue : 1) *
                                                    (
                                                        rateField == "PSTrxPrf" ? p.PSTrxPrf :
                                                        rateField == "PSNoMatch" ? p.PSNoMatch :
                                                        rateField == "PSFuzzy" ? p.PSFuzzy :
                                                        rateField == "PS100Match_Rep" ? p.PS100Match_Rep :
                                                        rateField == "PSLinquisticHourlyRate" ? p.PSLinquisticHourlyRate :
                                                        rateField == "PSDTPRate" ? p.PSDTPRate :
                                                        rateField == "PS_FZ50" ? p.PS_FZ50 :
                                                        rateField == "PS_FZ75" ? p.PS_FZ75 :
                                                        rateField == "PS_FZ85" ? p.PS_FZ85 :
                                                        rateField == "PS_FZ95" ? p.PS_FZ95 :
                                                        rateField == "PS_FZ100" ? p.PS_FZ100 :
                                                        rateField == "PS_FZREPS" ? p.PS_FZREPS :
                                                        rateField == "PSPerfectMatch" ? p.PSPerfectMatch : null
                                                    ) :
                                     // Discount in Amount
                                     // Take the Rate and substract the amount to discount
                                                   (
                                                        rateField == "PSTrxPrf" ? p.PSTrxPrf :
                                                        rateField == "PSNoMatch" ? p.PSNoMatch :
                                                        rateField == "PSFuzzy" ? p.PSFuzzy :
                                                        rateField == "PS100Match_Rep" ? p.PS100Match_Rep :
                                                        rateField == "PSLinquisticHourlyRate" ? p.PSLinquisticHourlyRate :
                                                        rateField == "PSDTPRate" ? p.PSDTPRate :
                                                        rateField == "PS_FZ50" ? p.PS_FZ50 :
                                                        rateField == "PS_FZ75" ? p.PS_FZ75 :
                                                        rateField == "PS_FZ85" ? p.PS_FZ85 :
                                                        rateField == "PS_FZ95" ? p.PS_FZ95 :
                                                        rateField == "PS_FZ100" ? p.PS_FZ100 :
                                                        rateField == "PS_FZREPS" ? p.PS_FZREPS :
                                                        rateField == "PSPerfectMatch" ? p.PSPerfectMatch : null
                                                     ) - (s.VolumeDiscountValue == null ? 0 : s.VolumeDiscountValue)),
                                 //PSMinFlatCharge = p.PSMinFlatCharge,
                                MinimumFee = p.PSMinFlatCharge,

                                 //Basis = b.PricingBasisDesc,
                                 Basis = task == "DTP" || task == "DTP Edit" ? p.PSDTPType : b.PricingBasisDesc,

                                 StatusOrder = p.CustomerID == customerID ? 0 : p.PSLanguageStatus == null ? 1000 : p.PSLanguageStatus
                             }).Distinct();

解決方法は？

簡単な答えは、「テキストを使わないこと」です。

のために非推奨とされた。 varchar(max) SQL Server 2005 がリリースされた何年も前に。

あなたが持っているコードは、SELECT DISTINCTを発行しています。
モデル/テーブルを修正する必要があります。 text データ型