ASP.Net repeater item.DataItem为null

在网页中,在加载时,我用两个表填充数据集,其中包含这些表之间的关系,然后将数据加载到具有嵌套转发器的转发器中.用户单击按钮后也会发生这种情况.数据从SQL数据库加载,并且在回发后将转发器数据源设置为数据集.但是,当ItemDataBound发生时,Item.Dataitem始终为null.

为什么会这样？

这是数据绑定代码：

this.rptCustomSpaList.DataSource = ds;
        this.rptCustomSpaList.DataBind();

这是ItemDataBound代码：

RepeaterItem item = e.Item; 

        Repeater ChildRepeater = (Repeater)item.FindControl("rptCustomSpaItem");
        DataRowView dv = e.Item.DataItem as DataRowView;
        ChildRepeater.DataSource = dv.CreateChildView("sparelation");
        ChildRepeater.DataBind();

下面是我的HTML转发器代码

<asp:Repeater ID="rptCustomSpaList" runat="server" 
 onitemdatabound="rptCustomSpaList_ItemDataBound">
    <HeaderTemplate></HeaderTemplate>
    <ItemTemplate>
        <table>
            <tr>
                <td><asp:Label ID="Label3" runat="server" Text="Spa Series:"></asp:Label></td>
                <td><asp:Label ID="Label4" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"SPASERIESVALUE") %>'></asp:Label></td>
            </tr>
            <tr>
                <td><asp:Label ID="Label5" runat="server" Text="Spa Model:"></asp:Label></td>
                <td><asp:Label ID="Label6" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"SPAMODELVALUE") %>'></asp:Label></td>
            </tr>
            <tr>
                <td><asp:Label ID="Label9" runat="server" Text="Acrylic Color:"></asp:Label></td>
               <td><asp:Label ID="Label10" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"ACRYLICCOLORVALUE") %>'></asp:Label></td>
            </tr>
            <tr>
  <td>
   <asp:Label ID="Label11" runat="server" Text="Cabinet Color:"></asp:Label>
  </td>
  <td>
   <asp:Label ID="Label12" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"CABPANCOLORVALUE") %>'></asp:Label>
  </td>
            </tr>
            <tr>
  <td>
   <asp:Label ID="Label17" runat="server" Text="Cabinet Type:"></asp:Label>
  </td>
  <td>
   <asp:Label ID="Label18" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"CABINETVALUE") %>'></asp:Label>
  </td>
  </tr>
  <tr>
  <td>
   <asp:Label ID="Label13" runat="server" Text="Cover Color:"></asp:Label>
  </td>
  <td>
   <asp:Label ID="Label14" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"COVERCOLORVALUE") %>'></asp:Label>
  </td>
  </tr>
  </table>
  <asp:Label ID="Label15" runat="server" Text="Options:"></asp:Label>
  <asp:Repeater ID="rptCustomSpaItem" runat="server">
   <HeaderTemplate>
    <table>
   </HeaderTemplate>
   <ItemTemplate>
    <tr>
    <td>
    <asp:Label ID="Label1" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"PROPERTY") %>'></asp:Label>
    </td>
    <td>
    <asp:Label ID="Label2" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"VALUE") %>'></asp:Label>
    </td>
    </tr>
   </ItemTemplate>
   <FooterTemplate>
    </table>
   </FooterTemplate>
  </asp:Repeater>
  <table>
  <tr>
  <td style="padding-top:15px;padding-bottom:30px;">
   <asp:Label ID="Label7" runat="server" Text="Configured Price:"></asp:Label>
  </td>
  <td style="padding-top:15px;padding-bottom:30px;">
   <asp:Label ID="Label8" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"SPAVALUEVALUE") %>'></asp:Label>
  </td>
  </tr>
  </table>
  <asp:Label ID="Label16" runat="server" Text="------"></asp:Label>
 </ItemTemplate>
 <FooterTemplate></FooterTemplate>
</asp:Repeater>

if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) 
{
    var data = e.Item.DataItem;
    // ....
}