Question

If I have a nested ListView, and I’m calling a related table in LinQ, how do I sort it, without resorting to the ItemDataBound event of the parent?

Pseudo Code (UPDATED WITH SOLUTION):

<asp:ListView ID='lv' runat='server' OnItemDataBound='lv_ItemDataBound' >    <LayoutTemplate>       <!-- Product Category Stuff -->        <asp:PlaceHolder Id='itemPlaceholder' runat='server'></asp:PlaceHolder>    </LayoutTemplate>     <ItemTemplate>       <asp:ListView ID='lvInner' runat='server' DataSource='<%# <%# ((Category)Container.DataItem).Products.OrderBy(p => p.Description) %> %>'>          <LayoutTemplate>             <ul>                <asp:PlaceHolder ID='itemPlaceholder' runat='server'></asp:PlaceHolder>             </ul>          </LayoutTemplate>          <ItemTemplate>             <li>Item Stuff</li>          </ItemTemplate>       </asp:ListView>    </ItemTemplate> </asp:ListView> 

Perhaps the method is deceptively simple, but I want the inner Products to be sorted by a field. I can’t see a way to do it declaratively as LinQ creates this Query on the fly, if I’m not mistaken, and doesn’t do sorting.

Any thoughts?

UPDATE

Updated the Example to the following:

<%# ((Category)Container.DataItem).Products.OrderBy(p => p.Description) %> 

Hope it helps someone else!

Answer 1

My assumption is that Products is an IEnumerable<Product> (or IQueryable). If that is the case, why not just add the OrderBy method to the evaluation, like so:

<%# Eval('Products.OrderBy(p => p.FieldToSortOn)') %>