Linq include() 适用于 dev，但不适用于 Azure

Question

>我有一个数据库模式如下：

FailureItem
---------------
FailureID int foreign key references Failure (FailureID)
DatabaseID int NULL foreign key references Items (DatabaseID)
FailureDescription varchar(200)
Item
---------------
DatabaseID int primary key identity(1,1)
ItemDescription varchar(200)

我正在使用linq将其绑定到网格视图，如下所示：

Dim items as List(Of FailureItems) =
    context.FailureItems.include("Item").where(function(x) x.FailureID = _failureID)

<asp:GridView ID="gv1" runat="server">
    <Columns>
        <asp:BoundField DataField="databaseID" Visible="false" />
        <asp:BoundField DataField="FailureDescription" headertext="Failure Description" />
        <asp:BoundField DataField="Item.ItemDescription" headertext="Item Description" />
    </Columns>
</asp:GridView>

这在我的开发机器上完美运行。当我将其发布到 azure 上时，出现错误"在所选数据源上找不到名为'Item.ItemDescription'的字段或属性"。我做错了什么？

Answer 1

我最终将代码更改为以下内容，这有效：

Dim items =
    (from fi in context.FailureItems
     where(fi.FailureID = _failureID)
     select new with {
         fi.databaseID,
         fi.FailureDescription,
         ItemDescription = If(fi.Item isnot nothing, fi.Item.ItemDescription, nothing)
     }).ToList