ASP .NET Nested ListView is not recognized

Question

I have following sample code, which uses nested ListView:

<asp:ListView ID="list" runat="server" ItemPlaceholderID="placeHolder"
        OnItemDataBound="listItemDataBound">
    <ItemTemplate>
        <p><%#Eval("name") %></p>
        <asp:ListView ID="sublist" runat="server" ItemPlaceholderID="subPlaceHolder">
            <ItemTemplate><%#Eval("subName") %></ItemTemplate>
            <LayoutTemplate>
                <asp:PlaceHolder ID="subPlaceHolder" runat="server"></asp:PlaceHolder>
            </LayoutTemplate>
        </asp:ListView>
    </ItemTemplate>
    <LayoutTemplate>
        <asp:PlaceHolder ID="placeHolder" runat="server"></asp:PlaceHolder>
    </LayoutTemplate>
</asp:ListView>

But nested ListView (sublist) is not recognized as a variable in my script code, so I can't access it and provide some databinding. When I add some other object inside main ListView (e.g. DataSource), it is also not recognized. How can I access nested ListView?

Thanks for any suggestion.

No, I mean C# server-side code, which handle OnItemDataBound of the main list. Nested ListView (sublist) is reported as not known in the current context. — Ivo Pavlik
– Ivo Pavlik, Commented Oct 29, 2012 at 12:39
Could you show the OnItemDataBound code you're trying to run? — Edwin de Koning
– Edwin de Koning, Commented Oct 29, 2012 at 12:42

Richard Deeming · Accepted Answer · 2012-10-29 12:54:26Z

2

Controls in the ItemTemplate will be created multiple times, once for each item in your data source, so the compiler cannot generate a single field to represent them. You'll need to use FindControl instead:

protected void listItemDataBound(object sender, ListViewItemEventArgs e)
{
   var sublist = (ListView)e.Item.FindControl("sublist");
   ...
}

answered Oct 29, 2012 at 12:54

Richard Deeming

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1 Comment

Ivo Pavlik Over a year ago

Thanks, that's exactly I was searching for.

markpsmith · Accepted Answer · 2012-10-29 12:54:32Z

0

Within your OnItemDataBound event code, you'll have to do this:

 if (e.Item.ItemType == ListViewItemType.DataItem)
 {
    ListView sublist = (ListView)e.Item.FindControl("sublist");
 }

In order to find your nested ListView

answered Oct 29, 2012 at 12:54

markpsmith

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