Question

我有很多实体。其中一个OrderLine实体使用了一些关系。这与AccountTransaction有关。当我从上下文中获得AccountTransaction类时，我可以使用延迟加载获得OrderLine个记录。但是当我从上下文OrderLine获得AccountTransaction类时，navigation属性为null。我怎么解决这个问题？

public partial class OrderLine : Base
{

    [Key, ForeignKey("AccountTransaction")]
    public int OrderLineId { get; set; }

    public virtual AccountTransaction AccountTransaction { get; set; }
}

public class AccountTransaction
{
    [Key]
    public int TransactionId { get; set; }

    [ForeignKey("OrderLine")]
    public int? OrderLineId { get; set; }

    public virtual OrderLine OrderLine { get; set; }        
}


var orderLine = context.OrderLines.Find(167069);
var accTransaction = context.AccountTransactions.Find(38770);


//orderLine.AccountTransaction; //here account transaction is null
//accTransaction.OrderLine;//here orderLine is not null.

Answer 1

您误导Function betterSearch(searchValue1 As Variant, searchValue2 As Variant, _ searchColumn1 As Range, searchColumn2 As Range, _ resultColumn As Range) Dim i As Long For i = 1 To Cells(Rows.Count, searchColumn1.Column).End(xlUp).Row If Cells(i, searchColumn1.Column).Value = searchValue1 _ And Cells(i, searchColumn2.Column).Value = searchValue2 Then betterSearch = Cells(i, resultColumn.Column) MsgBox ("found") Exit For End If betterSearch = "Not found" Next End Function。它用于指定子记录中关系的关键字段，在本例中为[ForeignKey]。尝试将模型更改为以下内容：

AccountTransaction

让我知道它是否有效或是否遇到其他问题。：）

实体框架可选的一对一关系不起作用

1 个答案: