问题描述
如果我有一个嵌套的 ListView,并且我在 LinQ 中调用了一个相关的表,我该如何排序而不求助于父级的 ItemDataBound 事件?
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?
伪代码(已更新解决方案):
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>
也许该方法看似简单,但我希望内部 Products 按字段排序.如果我没记错的话,我看不到以声明方式执行此操作的方法,因为 LinQ 会动态创建此查询,并且不进行排序.
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.
有什么想法吗?
更新
将示例更新为以下内容:
Updated the Example to the following:
<%# ((Category)Container.DataItem).Products.OrderBy(p => p.Description) %>
希望能帮到别人!
推荐答案
我的假设是 Products 是一个 IEnumerable
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)") %>