如何将实体数据源绑定到查询结果 [英] How can I bind an entity Data Source to the results of a query

问题描述

我有一个查询，它将消失并查找数据

I have a query that will go away an and find data

 Dim HSNs As String = String.Join(",", ListOfHSNs.Cast(Of String)().ToArray())



        Dim query As String = "SELECT VALUE O FROM v_BillData AS O WHERE O.HSNumber IN {'" & HSNs & "'}"



        Dim hs As New ObjectQuery(Of v_BillData)(query, CType(Session("ObjectCon"), ObjectContext))

我现在要做的是使用此查询的结果将数据绑定到EntityDataSource
我该怎么办

what I now wish to do is to use the results of this query to databind to a EntityDataSource How can I do this?

推荐答案

您可以尝试使用Selecting EntityDataSource事件，如以下示例所示：

You can try to use the Selecting EntityDataSource event like in the following example:

Protected Sub EntityDataSource1_Selecting(ByVal sender As Object, ByVal e As EntityDataSourceSelectingEventArgs)
  Dim HSNs As String = String.Join(",", ListOfHSNs.Cast(Of String)().ToArray())
  Dim query As String = "SELECT VALUE O FROM v_BillData AS O WHERE O.HSNumber IN {'" & HSNs & "'}"
  Dim source As EntityDataSource = Nothing
  source = TryCast(Me.Page.FindControl("EntityDataSource1"),EntityDataSource)
  If (Not source Is Nothing) Then
    source.EntitySetName = Nothing
    source.CommandText = query
  End If
End Sub

您应该将EntitySetName设置为Nothing，因为如果您设置了EntityDataSource，它将抛出错误之前。

You should set EntitySetName to Nothing because it will throw an error if you have setup EntityDataSource before.

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