Entity Framework 6 and LINQ – Duplicated Records
我有一个标准的实体框架实现直接查询一个表，根本不涉及任何视图，代码如下：
var r = cxt.HistoricalQualityComponents.Where(f => f.ProducerID == activeProducer);
一切正常，我希望有 24 条记录，我得到 24 条记录。除了当我查看 r 的内容时，我看到了第一个返回的记录，重复了 24 次。我查看生成的 SQL 并直接针对数据库运行它，我得到 24 条唯一记录。我通过在 activeProducer 更改时观察内容，甚至应用排序作为 LINQ 查询的一部分来得出结论。我不知道如何解决这个问题。这发生在我的数据库中有两个表，但没有其他表。
我尝试删除我的 .edmx 实体文件，我重命名了表(和生成的实体)，并创建了一个完整的 .aspx 文件来处理实体。当然，我这样修改了查询：
var r = from h in cxt.HistoricalQualityComponents where h.ProducerId == activeProducer select h;
没有什么不同。
这可能完全不相关，但在(非常懒惰地)在两个结果集上尝试以下操作后，我注意到了这种行为：
r.Sort(delegate(HistoricalQualityComponents c1, HistoricalQualityComponents c2) { return Convert.ToDateTime(c2.Pickup_Date).CompareTo(Convert.ToDateTime(c1.Pickup_Date)); });
此时，我只想回到一个干净的状态，这样我就可以实现一个模型类，它将数据存储到一个正确类型的对象中，我可以更适当地对其进行排序，但我不知所措下一步要去哪里。
更新：生成的 SQL 如下：
|
1
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 |
SELECT
[Extent1].[RcdID] AS [RcdID], [Extent1].[FieldRepID] AS [FieldRepID], [Extent1].[ProducerID] AS [ProducerID], [Extent1].[MonthYear_PK] AS [MonthYear_PK], [Extent1].[Weight] AS [Weight], [Extent1].[Fat] AS [Fat], [Extent1].[Protein] AS [Protein], [Extent1].[Lactose] AS [Lactose], [Extent1].[SNF] AS [SNF], [Extent1].[StateLeuc] AS [StateLeuc], [Extent1].[Leuc] AS [Leuc], [Extent1].[StateRaw] AS [StateRaw], [Extent1].[Raw] AS [Raw], [Extent1].[RawBracket] AS [RawBracket], [Extent1].[PI] AS [PI], [Extent1].[PIBracket] AS [PIBracket], [Extent1].[lpc_avg] AS [lpc_avg], [Extent1].[Water] AS [Water], [Extent1].[AB] AS [AB], [Extent1].[SED] AS [SED], [Extent1].[mun] AS [mun], [Extent1].[LStd] AS [LStd], [Extent1].[RStd] AS [RStd], [Extent1].[PStd] AS [PStd], [Extent1].[SStd] AS [SStd], [Extent1].[QualPremRate] AS [QualPremRate], [Extent1].[QualPremAmt] AS [QualPremAmt], [Extent1].[FYTDQualScore] AS [FYTDQualScore], [Extent1].[FYTDQualPrem] AS [FYTDQualPrem], [Extent1].[FYTDAvgQualPremRate] AS [FYTDAvgQualPremRate], [Extent1].[OtherSolids] AS [OtherSolids], [Extent1].[AshFactor] AS [AshFactor], [Extent1].[ash_wtd_avg] AS [ash_wtd_avg], [Extent1].[fat_wtd_avg] AS [fat_wtd_avg], [Extent1].[leuc_wtd_avg] AS [leuc_wtd_avg], [Extent1].[protein_wtd_avg] AS [protein_wtd_avg], [Extent1].[os_wtd_avg] AS [os_wtd_avg], [Extent1].[snf_wtd_avg] AS [snf_wtd_avg], [Extent1].[iodine_wtd_avg] AS [iodine_wtd_avg] FROM (SELECT [HistoricalQualityComponents].[RcdID] AS [RcdID], [HistoricalQualityComponents].[FieldRepID] AS [FieldRepID], [HistoricalQualityComponents].[ProducerID] AS [ProducerID], [HistoricalQualityComponents].[MonthYear_PK] AS [MonthYear_PK], [HistoricalQualityComponents].[Weight] AS [Weight], [HistoricalQualityComponents].[Fat] AS [Fat], [HistoricalQualityComponents].[Protein] AS [Protein], [HistoricalQualityComponents].[Lactose] AS [Lactose], [HistoricalQualityComponents].[SNF] AS [SNF], [HistoricalQualityComponents].[StateLeuc] AS [StateLeuc], [HistoricalQualityComponents].[Leuc] AS [Leuc], [HistoricalQualityComponents].[StateRaw] AS [StateRaw], [HistoricalQualityComponents].[Raw] AS [Raw], [HistoricalQualityComponents].[RawBracket] AS [RawBracket], [HistoricalQualityComponents].[PI] AS [PI], [HistoricalQualityComponents].[PIBracket] AS [PIBracket], [HistoricalQualityComponents].[lpc_avg] AS [lpc_avg], [HistoricalQualityComponents].[Water] AS [Water], [HistoricalQualityComponents].[AB] AS [AB], [HistoricalQualityComponents].[SED] AS [SED], [HistoricalQualityComponents].[mun] AS [mun], [HistoricalQualityComponents].[LStd] AS [LStd], [HistoricalQualityComponents].[RStd] AS [RStd], [HistoricalQualityComponents].[PStd] AS [PStd], [HistoricalQualityComponents].[SStd] AS [SStd], [HistoricalQualityComponents].[QualPremRate] AS [QualPremRate], [HistoricalQualityComponents].[QualPremAmt] AS [QualPremAmt], [HistoricalQualityComponents].[FYTDQualScore] AS [FYTDQualScore], [HistoricalQualityComponents].[FYTDQualPrem] AS [FYTDQualPrem], [HistoricalQualityComponents].[FYTDAvgQualPremRate] AS [FYTDAvgQualPremRate], [HistoricalQualityComponents].[OtherSolids] AS [OtherSolids], [HistoricalQualityComponents].[AshFactor] AS [AshFactor], [HistoricalQualityComponents].[ash_wtd_avg] AS [ash_wtd_avg], [HistoricalQualityComponents].[fat_wtd_avg] AS [fat_wtd_avg], [HistoricalQualityComponents].[leuc_wtd_avg] AS [leuc_wtd_avg], [HistoricalQualityComponents].[protein_wtd_avg] AS [protein_wtd_avg], [HistoricalQualityComponents].[os_wtd_avg] AS [os_wtd_avg], [HistoricalQualityComponents].[snf_wtd_avg] AS [snf_wtd_avg], [HistoricalQualityComponents].[iodine_wtd_avg] AS [iodine_wtd_avg] FROM [dbo].[HistoricalQualityComponents] AS [HistoricalQualityComponents]) AS [Extent1] WHERE [Extent1].[ProducerID] = @p__linq__0 |
如果您的实体模型中的键与数据库表中的键不匹配，则可能会发生这种情况。
例如，如果数据库中的键是由
原因是 EF 仅”看到”该对的第一部分
长话短说：检查实体模型中定义的键是否与数据库模式中的键匹配。
原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/269766.html