我有一个listview，显示来自和sql server视图的记录。 数据由customerid过滤，并在运行视图时具有2条唯一记录。 但是列表视图只显示第一条记录，并显示两次。 因此列表视图中显示了两条记录，但它没有显示视图生成的两条记录，它只是在视图中显示第一条记录两次。 我希望这很清楚。
发生了什么事？我一直在寻找没有运气的时间。
<asp:ListView ID="lstBeforeAfter" runat="server" DataKeyNames="CustomerID" InsertItemPosition="None">
<LayoutTemplate>
<div class="divreg">
<table ID="itemPlaceholderContainer" runat="server" cellpadding="2" class="tablebasic" style="vertical-align:top">
<tr ID="Tr1" runat="server" align="center">
<td style="background-color:#7e0d7d; color:White; font-size:1.2em; font-weight:bold; padding-top:4px; padding-bottom:4px">
Services
</td>
</tr>
<tr ID="itemPlaceholder" runat="server">
</tr>
</table>
</div>
</td>
</LayoutTemplate>
<ItemTemplate>
<tr style="">
<td align="center">
<div class="divwrap">
<div class="left3ColHeader">
<b>Date</b>
</div>
<div class="mid3ColHeader">
<b>Stylist</b>
</div>
<div class="right3ColHeader">
<b>Services</b>
</div>
<div class="formclear">
</div>
<div class="left3ColBorder">
<%# Eval("SchedStartDateTime", "{0:d}")%>
</div>
<div class="mid3ColBorder">
<%#Eval("FullName")%>
</div>
<div class="right3ColBorder">
<%#Eval("ServiceText")%>
</div>
<div class="formclear">
</div>
<div class="left2ColHeader">
<b>Before Picture</b>
</div>
<div class="right2ColHeader">
<b>After Picture</b>
</div>
<div class="formclear">
</div>
<div class="left2ColPicBorder">
<asp:Image ID="imgLeft" ImageUrl='<%# Eval("BeforePicPath") %>' runat="server" />
</div>
<div class="right2ColPicBorder">
<asp:Image runat="server" ID="imgRight" ImageUrl='<%# Eval("AfterPicPath") %>' />
</div>
<div class="formclear">
</div>
<div class="left2ColBorder">
<asp:Label ID="lblBefore" Width="95%" runat="server" Text='<%# Eval("BeforePicName") %>'></asp:Label>
</div>
<div class="right2ColBorder">
<asp:Label ID="lblAfter" Width="95%" runat="server" Text='<%# Eval("AfterPicName") %>'></asp:Label>
</div>
<div class="formclear">
</div>
<div class="divreg">
<hr />
</div>
<div class="formclear">
</div>
</div>
</td>
</tr>
</ItemTemplate>
<AlternatingItemTemplate>
<tr style="background-color:#ffffd9">
<td align="center">
<div class="divwrap">
<div class="left3ColHeader">
<b>Date</b>
</div>
<div class="mid3ColHeader">
<b>Stylist</b>
</div>
<div class="right3ColHeader">
<b>Services</b>
</div>
<div class="formclear">
</div>
<div class="left3ColBorder">
<%# Eval("SchedStartDateTime", "{0:d}")%>
</div>
<div class="mid3ColBorder">
<%#Eval("FullName")%>
</div>
<div class="right3ColBorder">
<%# Eval("ServiceText").ToString%>
</div>
<div class="formclear">
</div>
<div class="left2ColHeader">
<b>Before Picture</b>
</div>
<div class="right2ColHeader">
<b>After Picture</b>
</div>
<div class="formclear">
</div>
<div class="left2ColPicBorder">
<asp:Image ID="imgLeft" ImageUrl='<%# Eval("BeforePicPath") %>' runat="server" />
</div>
<div class="right2ColPicBorder">
<asp:Image runat="server" ID="imgRight" ImageUrl='<%# Eval("AfterPicPath") %>' />
</div>
<div class="formclear">
</div>
<div class="left2ColBorder">
<asp:Label ID="lblBefore" Width="95%" runat="server" Text='<%# Eval("BeforePicName") %>'></asp:Label>
</div>
<div class="right2ColBorder">
<asp:Label ID="lblAfter" Width="95%" runat="server" Text='<%# Eval("AfterPicName") %>'></asp:Label>
</div>
<div class="formclear">
</div>
<div class="divreg">
<hr />
</div>
<div class="formclear"> </div>
</div>
</td>
</tr>
</AlternatingItemTemplate>
</asp:ListView>
Protected Sub LoadPortfolio(ByVal iCustID As Integer)
Dim dc As New SalonDataClassesDataContext
Dim q = From p In dc.vClientStyles Where p.CustomerID = iCustID Order By p.SchedStartDateTime Descending Select p
If q.Count > 0 Then
Me.lstBeforeAfter.DataSource = q
Me.lstBeforeAfter.DataBind()
End If
End Sub
SELECT ISNULL(dbo.Services.ServiceID, 0) AS ServiceID, dbo.Schedules.SchedStartDateTime, dbo.Schedules.ServiceText, dbo.Schedules.CustomerID,
ISNULL(dbo.Services.Completed, 0) AS Completed, dbo.Stylists.FullName, dbo.Stylists.StylistID, ISNULL(dbo.Services.BeforePicName, 'No Title') AS BeforePicName,
ISNULL(dbo.Services.BeforePicPath, '../images2020/resume-photo.jpg') AS BeforePicPath, ISNULL(dbo.Services.AfterPicName, 'No Title') AS AfterPicName,
ISNULL(dbo.Services.AfterPicPath, '../images2020/resume-photo.jpg') AS AfterPicPath
FROM dbo.Schedules INNER JOIN dbo.Stylists ON dbo.Schedules.UserID = dbo.Stylists.UserID LEFT OUTER JOIN dbo.Services ON dbo.Schedules.ServiceID = dbo.Services.ServiceID
ORDER BY dbo.Schedules.SchedStartDateTime DESC
更改为联合查询，但linq不喜欢它。
SELECT ISNULL(dbo.Schedules.ServiceID, 0) AS ServiceID, dbo.Schedules.SchedStartDateTime, dbo.Schedules.ServiceText, dbo.Schedules.CustomerID,
ISNULL(dbo.Schedules.Completed, 0) AS Completed, dbo.Stylists.FullName, dbo.Stylists.StylistID, 'No Title' AS BeforePicName, '../images2020/resume-photo.jpg' AS BeforePicPath, 'No Title' AS AfterPicName, '../images2020/resume-photo.jpg' AS AfterPicPath
FROM dbo.Schedules INNER JOIN dbo.Stylists ON dbo.Schedules.UserID = dbo.Stylists.UserID
Where dbo.Schedules.CustomerID = 27
UNION
SELECT ISNULL(dbo.Services.ServiceID, 0) AS ServiceID, dbo.Schedules.SchedStartDateTime, dbo.Schedules.ServiceText, dbo.Schedules.CustomerID,
ISNULL(dbo.Services.Completed, 0) AS Completed, dbo.Stylists.FullName, dbo.Stylists.StylistID, ISNULL(dbo.Services.BeforePicName, 'No Title') AS BeforePicName,
ISNULL(dbo.Services.BeforePicPath, '../images2020/resume-photo.jpg') AS BeforePicPath, ISNULL(dbo.Services.AfterPicName, 'No Title') AS AfterPicName, ISNULL(dbo.Services.AfterPicPath, '../images2020/resume-photo.jpg') AS AfterPicPath
FROM dbo.Schedules INNER JOIN dbo.Stylists ON dbo.Schedules.UserID = dbo.Stylists.UserID INNER JOIN dbo.Services ON dbo.Schedules.ServiceID = dbo.Services.ServiceID
Where dbo.Schedules.CustomerID = 27 ORDER BY dbo.Schedules.SchedStartDateTime DESC
我现在收到错误...查询结果不能多次枚举。
我做错了什么？ 感谢
答案 0 :(得分：0)
编辑3
DataKeyNames中返回的数据必须是唯一的。您具有相同CustomerID的事实意味着您需要另一列来创建唯一键。从理论上讲，您可以在DataKeyNames中拥有CustomerID和ServiceID，但事实上您有一些空的ServiceID记录会使其变得困难。
为什么不在每个名为“MyUniqueID”的选择中添加新列，并将其值设置为NewId（）。然后使用MyUniqueID作为DataKeyNames。
SELECT NewId() as MyUniqueID from blah
NewId（）函数将确保为结果集中的每一行获取全局unqiue标识符，但不对任何后续操作使用UniqueID，因为数据不会保留在数据库中，因此每次ListView都会丢失得到了更新。
在您的示例中很难理解为什么使用union，主要是因为很难格式化stackoverflow代码块。但是很明显，您不止一次拥有相同的客户ID，因此它不能单独用作唯一的DataKeyName。
或者CustomerID + UserID中的Schedules是唯一的，应该合并在DataKeyNames中吗？
在DataKeyNames中指定多个列，如下所示： -
DataKeysNames="CustomerID,UserID,ServiceID"
如果这不起作用，您应该向单ListView解释您希望返回CustomerID的内容以及ListView中每条记录的唯一属性
取出联盟，你的第一个例子看起来效果最好，除了唯一性