Limit the number of results in a Nested ASP.NET ListView

Question

Similar to my other question:

I have a ListView bound to a Dictionary. Then I have a nested ListView for the dictionary's value's integers.

I need to limit the number of items bound to the nested list to something like 5, and show a more button in the template.

I can't find a way to get the more button to work, and to correctly limit the number at the same time. I have it working as one or the other right now.

Any ideas? Thanks!

UPDATE:

The markup looks something like this:

<asp:ListView runat="server" ID="MainListView" ItemPlaceholderID="PlaceHolder2">
 <LayoutTemplate>
  <asp:PlaceHolder runat="server" ID="PlaceHolder2" />
 </LayoutTemplate>
 <ItemTemplate>
  <h1>My Main ListView - <%# Eval("Key") %></h1>
  <asp:ListView runat="server" ID="NestedListView" ItemPlaceholderID="PlaceHolder3"
  DataSource='<%# Eval("Value") %>' >
  <LayoutTemplate>
   <h2>One of many Nested ListViews</h2>
   <asp:PlaceHolder runat="server" ID="PlaceHolder3" />
  </LayoutTemplate>
  <ItemTemplate>
    <asp:LinkButton runat="server" ID="AnInteger" Text='<%# Eval("value") %>'></asp:LinkButton>
    <br />
  </ItemTemplate>
  </asp:ListView>
  <asp:LinkButton runat="server" ID="uxMoreIntegers" Text="More..." Visible="false" OnClick="uxMoreIntegers_Click"></asp:LinkButton>
 </ItemTemplate>
</asp:ListView>

Answer 1

The Take method will return the first 5 items in your list, but won't modify the list itself. You can then simply check the number of items in the list to determine if the more button needs to be enabled.

someList.Take(5); //use these items in your ListView
moreButton.Enabled = (someList.Count > 5);

Answer 2

1. DataBind the main ListView anyway you want.
2. DataBind the nested ListView programmatically in the ItemDataBound event for the main ListView

Code:

protected void uxListView_ItemDataBound(object sender, ListViewItemEventArgs e)
{
    if (e.Item.ItemType == ListViewItemType.DataItem)
    {
        ListViewDataItem item = (ListViewDataItem)e.Item;

        // Get the bound object (KeyValuePair from the dictionary)
        KeyValuePair<string, List<int>> nestedIntegerList = (KeyValuePair<string, List<int>>)item.DataItem;

        // Get our nested ListView for this Item
        ListView nestedListView = (ListView)e.Item.FindControl("uxNestedListView");

        // Check the number of items
        if (nestedIntegerList.Value.Count > 5)
        {
            // There are more items than we want to show, so show the "More..." button
            LinkButton button = (LinkButton)item.FindControl("uxMore");
            button.Visible = true;
        }

        // Bind the nestedListView to wahtever you want 
        nestedListView.DataSource = nestedIntegerList.Value.Take(5);
        nestedListView.DataBind();
    }
}