我正在使用 Entity Framework 查询数据库。为了限制我使用 Take(1000) 的结果。问题是 EF 返回超过 1000 行，#1000 之后的所有实体都不包含正确的数据。
这是表结构:
查询看起来像这样:
var resultListTmp = db.TinglysEjendom.Where(x => x.EjdStatus == description)
.Include(x => x.TinglysEjd_ESR.Select(y => y.ESR))
.Include(nameof(TingLysMatrikkel))
.Take(amount).AsNoTracking().ToList();
问题是 #1000 之后的所有 TinglysEjendom 实体都没有任何 TinglysMatrikkel 关系，但在数据库中它们有。
删除时:
.Include(x => x.TinglysEjd_ESR.Select(y => y.ESR))
从查询中，EF 返回正确的行数。
TinglysMatrikkel 表中的 MatrikkelNummer 列可以(除其他外)取值:
直径 å
有人建议这可能是 i18n 的“国际化和本地化”问题。我不确定这是怎么回事。也许有人可以为我指出正确的方向？
提前致谢
LINQ 将上述查询转换为:
exec sp_executesql N'SELECT
[UnionAll1].[EjdId] AS [C1],
[UnionAll1].[EjdId1] AS [C2],
[UnionAll1].[EjdType] AS [C3],
[UnionAll1].[BygningsNr] AS [C4],
[UnionAll1].[TimeshareNr] AS [C5],
[UnionAll1].[AnpartsNr] AS [C6],
[UnionAll1].[EjerLejNr] AS [C7],
[UnionAll1].[Beskrivelse] AS [C8],
[UnionAll1].[StreetBuildingIdentifier] AS [C9],
[UnionAll1].[EjdStatus] AS [C10],
[UnionAll1].[StatusTimestamp] AS [C11],
[UnionAll1].[IAbonnement] AS [C12],
[UnionAll1].[AbonnementOpretAttempts] AS [C13],
[UnionAll1].[AbonnementsId] AS [C14],
[UnionAll1].[BestemtFastEjendomsNummer] AS [C15],
[UnionAll1].[UpdateToken] AS [C16],
[UnionAll1].[FaellesEjendomIdentifikator] AS [C17],
[UnionAll1].[C1] AS [C18],
[UnionAll1].[ESRId] AS [C19],
[UnionAll1].[ESRId1] AS [C20],
[UnionAll1].[EjdId2] AS [C21],
[UnionAll1].[Passiv] AS [C22],
[UnionAll1].[ESRId2] AS [C23],
[UnionAll1].[EjdId3] AS [C24],
[UnionAll1].[ESRId3] AS [C25],
[UnionAll1].[ESR_Kommune] AS [C26],
[UnionAll1].[ESR_EjdNummer] AS [C27],
[UnionAll1].[UdgaaetCognito] AS [C28],
[UnionAll1].[Status] AS [C29],
[UnionAll1].[C2] AS [C30],
[UnionAll1].[C3] AS [C31],
[UnionAll1].[C4] AS [C32],
[UnionAll1].[C5] AS [C33]
FROM (SELECT
CASE WHEN ([Join1].[ESRId1] IS NULL) THEN CAST(NULL AS int) ELSE 1 END AS [C1],
[Limit1].[EjdId] AS [EjdId],
[Limit1].[EjdId] AS [EjdId1],
[Limit1].[EjdType] AS [EjdType],
[Limit1].[BygningsNr] AS [BygningsNr],
[Limit1].[TimeshareNr] AS [TimeshareNr],
[Limit1].[AnpartsNr] AS [AnpartsNr],
[Limit1].[EjerLejNr] AS [EjerLejNr],
[Limit1].[Beskrivelse] AS [Beskrivelse],
[Limit1].[StreetBuildingIdentifier] AS [StreetBuildingIdentifier],
[Limit1].[EjdStatus] AS [EjdStatus],
[Limit1].[StatusTimestamp] AS [StatusTimestamp],
[Limit1].[IAbonnement] AS [IAbonnement],
[Limit1].[AbonnementOpretAttempts] AS [AbonnementOpretAttempts],
[Limit1].[AbonnementsId] AS [AbonnementsId],
[Limit1].[BestemtFastEjendomsNummer] AS [BestemtFastEjendomsNummer],
[Limit1].[UpdateToken] AS [UpdateToken],
[Limit1].[FaellesEjendomIdentifikator] AS [FaellesEjendomIdentifikator],
[Join1].[ESRId1] AS [ESRId],
[Join1].[ESRId1] AS [ESRId1],
[Join1].[EjdId] AS [EjdId2],
[Join1].[Passiv] AS [Passiv],
[Join1].[ESRId1] AS [ESRId2],
[Join1].[EjdId] AS [EjdId3],
[Join1].[ESRId2] AS [ESRId3],
[Join1].[ESR_Kommune] AS [ESR_Kommune],
[Join1].[ESR_EjdNummer] AS [ESR_EjdNummer],
[Join1].[UdgaaetCognito] AS [UdgaaetCognito],
[Join1].[Status] AS [Status],
CAST(NULL AS int) AS [C2],
CAST(NULL AS varchar(1)) AS [C3],
CAST(NULL AS varchar(1)) AS [C4],
CAST(NULL AS int) AS [C5]
FROM (SELECT TOP (1000)
[Extent1].[EjdId] AS [EjdId],
[Extent1].[EjdType] AS [EjdType],
[Extent1].[BygningsNr] AS [BygningsNr],
[Extent1].[TimeshareNr] AS [TimeshareNr],
[Extent1].[AnpartsNr] AS [AnpartsNr],
[Extent1].[EjerLejNr] AS [EjerLejNr],
[Extent1].[Beskrivelse] AS [Beskrivelse],
[Extent1].[StreetBuildingIdentifier] AS [StreetBuildingIdentifier],
[Extent1].[EjdStatus] AS [EjdStatus],
[Extent1].[StatusTimestamp] AS [StatusTimestamp],
[Extent1].[IAbonnement] AS [IAbonnement],
[Extent1].[AbonnementOpretAttempts] AS [AbonnementOpretAttempts],
[Extent1].[AbonnementsId] AS [AbonnementsId],
[Extent1].[BestemtFastEjendomsNummer] AS [BestemtFastEjendomsNummer],
[Extent1].[UpdateToken] AS [UpdateToken],
[Extent1].[FaellesEjendomIdentifikator] AS [FaellesEjendomIdentifikator]
FROM [dbo].[TinglysEjendom] AS [Extent1]
WHERE [Extent1].[EjdStatus] = @p__linq__0 ) AS [Limit1]
LEFT OUTER JOIN (SELECT [Extent2].[ESRId] AS [ESRId1], [Extent2].[EjdId] AS [EjdId], [Extent2].[Passiv] AS [Passiv], [Extent3].[ESRId] AS [ESRId2], [Extent3].[ESR_Kommune] AS [ESR_Kommune], [Extent3].[ESR_EjdNummer] AS [ESR_EjdNummer], [Extent3].[UdgaaetCognito] AS [UdgaaetCognito], [Extent3].[Status] AS [Status]
FROM [dbo].[TinglysEjd_ESR] AS [Extent2]
INNER JOIN [dbo].[ESR] AS [Extent3] ON [Extent2].[ESRId] = [Extent3].[ESRId] ) AS [Join1] ON [Limit1].[EjdId] = [Join1].[EjdId]
UNION ALL
SELECT
2 AS [C1],
[Limit2].[EjdId] AS [EjdId],
[Limit2].[EjdId] AS [EjdId1],
[Limit2].[EjdType] AS [EjdType],
[Limit2].[BygningsNr] AS [BygningsNr],
[Limit2].[TimeshareNr] AS [TimeshareNr],
[Limit2].[AnpartsNr] AS [AnpartsNr],
[Limit2].[EjerLejNr] AS [EjerLejNr],
[Limit2].[Beskrivelse] AS [Beskrivelse],
[Limit2].[StreetBuildingIdentifier] AS [StreetBuildingIdentifier],
[Limit2].[EjdStatus] AS [EjdStatus],
[Limit2].[StatusTimestamp] AS [StatusTimestamp],
[Limit2].[IAbonnement] AS [IAbonnement],
[Limit2].[AbonnementOpretAttempts] AS [AbonnementOpretAttempts],
[Limit2].[AbonnementsId] AS [AbonnementsId],
[Limit2].[BestemtFastEjendomsNummer] AS [BestemtFastEjendomsNummer],
[Limit2].[UpdateToken] AS [UpdateToken],
[Limit2].[FaellesEjendomIdentifikator] AS [FaellesEjendomIdentifikator],
CAST(NULL AS int) AS [C2],
CAST(NULL AS int) AS [C3],
CAST(NULL AS int) AS [C4],
CAST(NULL AS bit) AS [C5],
CAST(NULL AS int) AS [C6],
CAST(NULL AS int) AS [C7],
CAST(NULL AS int) AS [C8],
CAST(NULL AS int) AS [C9],
CAST(NULL AS int) AS [C10],
CAST(NULL AS bit) AS [C11],
CAST(NULL AS varchar(1)) AS [C12],
[Extent5].[EjdId] AS [EjdId2],
[Extent5].[LandsEjerlavKode] AS [LandsEjerlavKode],
[Extent5].[MatrikkelNummer] AS [MatrikkelNummer],
[Extent5].[EjdId] AS [EjdId3]
FROM (SELECT TOP (1000)
[Extent4].[EjdId] AS [EjdId],
[Extent4].[EjdType] AS [EjdType],
[Extent4].[BygningsNr] AS [BygningsNr],
[Extent4].[TimeshareNr] AS [TimeshareNr],
[Extent4].[AnpartsNr] AS [AnpartsNr],
[Extent4].[EjerLejNr] AS [EjerLejNr],
[Extent4].[Beskrivelse] AS [Beskrivelse],
[Extent4].[StreetBuildingIdentifier] AS [StreetBuildingIdentifier],
[Extent4].[EjdStatus] AS [EjdStatus],
[Extent4].[StatusTimestamp] AS [StatusTimestamp],
[Extent4].[IAbonnement] AS [IAbonnement],
[Extent4].[AbonnementOpretAttempts] AS [AbonnementOpretAttempts],
[Extent4].[AbonnementsId] AS [AbonnementsId],
[Extent4].[BestemtFastEjendomsNummer] AS [BestemtFastEjendomsNummer],
[Extent4].[UpdateToken] AS [UpdateToken],
[Extent4].[FaellesEjendomIdentifikator] AS [FaellesEjendomIdentifikator]
FROM [dbo].[TinglysEjendom] AS [Extent4]
WHERE [Extent4].[EjdStatus] = @p__linq__0 ) AS [Limit2]
INNER JOIN [dbo].[TingLysMatrikkel] AS [Extent5] ON [Limit2].[EjdId] = [Extent5].[EjdId]) AS [UnionAll1]
ORDER BY [UnionAll1].[EjdId1] ASC, [UnionAll1].[C1] ASC',N'@p__linq__0 nvarchar(4000)',@p__linq__0=N'HentData'
最佳答案
这在 C# 部分看起来有点不可靠。也就是说，由 Entity Framework 将其转换为执行您所要求的 SQL，但它未能做到这一点。如果还没有，可能值得将其报告为错误。
如果仔细查看 SQL，您会发现两个单独的查询使用 TOP (1000) 并通过 UNION ALL 组合。但是，这些查询都没有使用任何 ORDER BY，因此没有什么可以阻止 SQL Server 选择一组不同的 1000 条记录，例如，它可能会这样做。与第二部分相比，它可以对查询的第一部分使用不同的索引。
您应该能够通过指定您希望返回的前 1000 条记录来解决这个问题。如果您不关心订单，只需按 ID 订购即可。
关于c# - 为什么 Take() 返回的行数多于指定的行数？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40186334/