c# - 使用 EntityDataSource 选择命令时如何 UNION 2 选择

Question

我正在将EntityDataSource绑定到 Web 表单应用程序中的 DataGrid 并使用Select属性来连接几个表并返回查询结果，但我似乎无法找到一种方法来联合来自 2 个选择的结果。有没有办法做到这一点，或者我是否需要放入CommandText或转换为绑定到使用 Linq 的存储库查找结果的标准数据源。

这是添加 UNION 之前的示例：

<asp:EntityDataSource runat="server" id="DonationChildDataSource" 
      ConnectionString="name=myDonationEntities" 
      DefaultContainerName="myDonationEntities" 
      EnableFlattening="False" 
      EntitySetName="WPRecurringDonations" 
      OrderBy="it.id"
      Select="it.WPOnetimeDonation.wponetime_donation_id as id, 
        it.WPOnetimeDonation.DonationOccurrenceType.donation_occurrence_type_tag as typeid, 
        it.WPOnetimeDonation.donation_amount as amount,  
        it.WPOnetimeDonation.Currency.currency_iso as currency_iso,
        it.for_date as date, 
        it.merchant_code_used as merchant, 
        it.WPDonationStatus.wpdonation_status_tag as status,
        it.worldpay_response           
        " 
      >
</asp:EntityDataSource>