實體框架包括表空

Question

我用我分貝第一，並有特定關聯，它總是返回空值，使用：

var results = _ABPRepository.Query(x => x.ABPArrangementId == arrangementId) 
        .Include(x => x.tb_ARRArrangement) 
        .Include(x => x.tb_ARRArrangement.Supplier) 
        .Include(x => x.tb_ARRArrangement.Supplier.tb_SCNSicCodesNew) 
        .Include(x => x.tb_BBRBatteryBackBrands) 
        .Include(x => x.tb_ARRArrangement.Supplier.Country) 
        .Include(x => x.tb_ARRArrangement.Supplier.InvoiceCountry) 
        .Include(x => x.Country) 
        .Select().FirstOrDefault(); 

下面總是空：

x.tb_ARRArrangement.Supplier.tb_SCNSicCodesNew 

我已經驗證該SQL是正確的（下面簡要）：

SELECT 
    /* ... */ 
    [Project1].[SCN_SIC_Code] AS [SCN_SIC_Code], 
    [Project1].[SCN_SIC_Description] AS [SCN_SIC_Description] 
    /* ... */ 
    FROM (SELECT 
     /* ... */ 
     [Extent4].[SCN_SIC_Code] AS [SCN_SIC_Code], 
     [Extent4].[SCN_SIC_Description] AS [SCN_SIC_Description], 
     /* ... */ 
     CASE WHEN ([Extent8].[BBRIDNumber] IS NULL) THEN CAST(NULL AS int) ELSE 1 END AS [C1] 
     FROM  [dbo].[tb_ABPArrangementBatteryBackProducer] AS [Extent1] 
     INNER JOIN [dbo].[tb_ARRArrangement] AS [Extent2] ON [Extent1].[ABPArrangementId] = [Extent2].[ARRIDNumber] 
     LEFT OUTER JOIN [dbo].[tb_SUPSupplier] AS [Extent3] ON [Extent2].[ARRSupplierId] = [Extent3].[SUPKey] 
     LEFT OUTER JOIN (SELECT 
           [tb_SCNSicCodesNew].[SCN_SIC_Code] AS [SCN_SIC_Code], 
           [tb_SCNSicCodesNew].[SCN_SIC_Description] AS [SCN_SIC_Description] 
         FROM [dbo].[tb_SCNSicCodesNew] AS [tb_SCNSicCodesNew]) AS [Extent4] ON [Extent3].[SUPEaHwrSicCode2007] = [Extent4].[SCN_SIC_Code] 
     LEFT OUTER JOIN [dbo].[tb_COUCountry] AS [Extent5] ON [Extent3].[SUPCountry] = [Extent5].[COUIDNumber] 
     LEFT OUTER JOIN [dbo].[tb_COUCountry] AS [Extent6] ON [Extent3].[SUPInvoiceCountry] = [Extent6].[COUIDNumber] 
     INNER JOIN [dbo].[tb_COUCountry] AS [Extent7] ON [Extent1].[ABPCorrespondanceCountry] = [Extent7].[COUIDNumber] 
     LEFT OUTER JOIN [dbo].[tb_BBRBatteryBackBrands] AS [Extent8] ON [Extent1].[ABPArrangementId] = [Extent8].[BBRABPIDNumber] 
     WHERE [Extent1].[ABPArrangementId] = 123456 
    ) AS [Project1] 

返回的記錄包含了我所期望的數據，但它不能映射到t他 results.tb_ARRArrangement.Supplier.tb_SCNSicCodesNew財產。

所有其他包括按預期工作。

我已經試過：

• 閱讀有關地方包括可能無法正常工作（分組等），但他們似乎 不適用於我的方案爲包括不會被忽略， 更多的映射似乎失敗。

• 卸下從EDMX和所述關聯和表重新添加

• 重命名，並重新使關聯和導航屬性

• 清潔和重新構建

有不是表格之間的數據庫中的外鍵，但其他人也沒有，因此我沒有任何問題。

要檢查的東西的任何指針？

Answer 1

這是實體框架與加入固定長度的字符串爲可變長度的問題，因爲這裏說明：https://romiller.com/2014/10/20/ef6-1workaround-trailing-blanks-issue-in-string-joins/

的問題是，SQL Server忽略比較 字符串，但.NET字符串函數時，尾部的空格（EF使用的）沒有。在SQL上 服務器「ABCD」和「ABCD」被認爲是相等的，但在.NET中（和 EF）它們不是。

這導致正確的數據被選中但未映射。

using System.Data.Entity; 

namespace FixedLengthDemo 
{ 
    public class MyConfiguration : DbConfiguration 
    { 
     public MyConfiguration() 
     { 
      AddInterceptor(new StringTrimmerInterceptor()); 
     } 
    } 
}