Question

我的EF6（代码优先）应用程序中有以下代码行：

var priceDetail = context.PriceLists.Include(pl => pl.PriceDetails).FirstOrDefault();

我的目标是检索第一个PriceList对象，其中包含PriceDetail s的集合。

当该行执行时，我收到此错误：

-- Failed in 12 ms with error: Invalid column name 'Order_OrderNumber'.

这对我来说很奇怪，因为PriceList和PriceDetail对象都没有引用Order对象。这是PriceList对象：

[Table( "dbo.PriceList" )]
public class PriceList
{
    public int PriceListId { get; set; }

    [StringLength( 150 )]
    [Display( Name = "PriceList name" )]
    public string PriceListDesc { get; set; }

    public virtual ICollection<PriceListDetail> PriceDetails { get; set; }
}

这是PriceDetail对象：

[Table( "dbo.PriceDetail" )]
public class PriceDetail
{
    [ColumnDesc( "Primary key" )]
    public int PriceDetailId { get; set; }

    [ForeignKey( "PriceList" )]
    public int PriceListId { get; set; }
    public PriceList PriceList { get; set; }

    [ForeignKey( "Item" )]
    public int ItemNumber { get; set; }
    public Item Item { get; set; }

    public Decimal Price { get; set; }

    public Decimal? CostMultiplier { get; set; }
}

EF生成的完整SQL查询如下：

SELECT 
    [Project1].[PriceListId] AS [PriceListId], 
    [Project1].[PriceListDesc] AS [PriceListDesc], 
    [Project1].[C1] AS [C1], 
    [Project1].[PriceDetailId] AS [PriceDetailId], 
    [Project1].[PriceListId1] AS [PriceListId1], 
    [Project1].[ItemNumber] AS [ItemNumber], 
    [Project1].[PriceList] AS [PriceList], 
    [Project1].[Order_OrderNumber] AS [Order_OrderNumber]
    FROM ( SELECT 
        [Limit1].[PriceListId] AS [PriceListId], 
        [Limit1].[PriceListDesc] AS [PriceListDesc], 
        [Extent2].[PriceDetailId] AS [PriceDetailId], 
        [Extent2].[PriceListId] AS [PriceListId1], 
        [Extent2].[ItemNumber] AS [ItemNumber], 
        [Extent2].[PriceList] AS [PriceList], 
        [Extent2].[Order_OrderNumber] AS [Order_OrderNumber], 
        CASE WHEN ([Extent2].[PriceDetailId] IS NULL) THEN CAST(NULL AS int) ELSE 1 END AS [C1]
        FROM   (SELECT TOP (1) [c].[PriceListId] AS [PriceListId], [c].[PriceListDesc] AS [PriceListDesc]
            FROM [Admin].[PriceList] AS [c] ) AS [Limit1]
        LEFT OUTER JOIN [Admin].[PriceDetail] AS [Extent2] ON [Limit1].[PriceListId] = [Extent2].[PriceListId]
    )  AS [Project1]
    ORDER BY [Project1].[PriceListId] ASC, [Project1].[C1] ASC

为什么我收到此错误？

Answer 1

我终于弄明白了。在我的Order对象中，我有以下代码行：

public ICollection<PriceDetail> PriceDetails => AssignedLocation?.LocationDetail?.PriceList?.PriceDetails;

为方便起见，这纯粹是一个访问器，因此订单对象可以更容易地到达子子类。

由于某种原因，我不完全理解，实体框架将此解释为表示PriceDetail和Order表之间存在某种关系，导致上述查询。

决议很简单：

[NotMapped]
public ICollection<PriceDetail> PriceDetails => AssignedLocation?.LocationDetail?.PriceList?.PriceDetails;

添加此属性足以解除实体框架的混淆。

实体框架错误＆＃34;无效的列名称＆＃34;从特定表中获取时

1 个答案: