More on Dynamically Loading ListView Templates

MikeO [MSFT]

22 Aug 2008 7:31 AM

Comments 6

I got quite a few comments on my post on Dynamically Loading ListView Templates so rather than trying to paste code into a comment in reply, I thought I'd paste an update here. Specific issues raised were problems when databinding without a DataSource control and problems on postback. Here's a new version that addresses both those issues:

<%@ Page Language="C#" CodeFile="Default.aspx.cs" Inherits="Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server"></head>
<body>
  <form id="form1" runat="server">

  <asp:ListView ID="ListView1" 
    runat="server" 
    ItemPlaceholderID="MyLayout$itemPlaceholder"
    OnLayoutCreated="ListView1_LayoutCreated">
  </asp:ListView>

  <asp:Button ID="Button1" runat="server" Text="I Do Postbacks" />

  </form>
</body>
</html>

using System;
using System.Linq;
using System.Web.UI;
using System.Xml.Linq;

public partial class Default : System.Web.UI.Page
{
  protected void Page_Load(object sender, EventArgs e)
  {
    XDocument xdoc = XDocument.Load(Server.MapPath("~/XmlFile.xml"));

    var query = from x in xdoc.Descendants("book")
                select new { id = (string)x.Attribute("id") };

    ListView1.DataSource = query;
    ListView1.DataBind();
  }

  protected void ListView1_LayoutCreated(object sender, EventArgs e)
  {
    ListView1.LayoutTemplate = LoadTemplate("WebUserControl.ascx");
    ListView1.ItemTemplate = LoadTemplate("WebUserControl2.ascx");

    Control newLayoutContainer = new Control();
    ListView1.LayoutTemplate.InstantiateIn(newLayoutContainer);
    var userControl = newLayoutContainer.Controls[0];
    userControl.ID = "MyLayout";
    ListView1.Controls.Add(newLayoutContainer);
  }
}

Hope that's useful.

Technorati Tags: asp.net,listview

ASP.NET, Musings, Technology General, Community, Event Q+A, ReMixUK08

Comments

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22 Aug 2008 7:38 AM

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23 Aug 2008 7:12 PM

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bartekmarnane

24 Aug 2008 8:23 PM

Hi Mike,

Great example, thank you!
Den

27 Aug 2008 6:27 AM

Does anyone know? Is it possible to paste serverside tags like: <%# XPath("text") %> into property. I've done it in page_loag, but still <%# XPath("text") %> in generated html code.
Gerald

15 Sep 2008 9:17 AM

Hi thanks for the great tips. I have successfully loaded various custom templates into listview programmatically at runtime.

However, is there anyway I could make a Datapager work with the runtime created layout template? The paging numbers appear correctly (no.pages = no.items/pagesize) etc, however on postback call to update listview, it will look for itemPlaceholder again and says it is not found. I attempted to redo the Layout_Created codes at OnPagePropertiesChanging event, but to no avail.

Hope you can help enlighten me on how to code for paging if the templates are custom coded.
sushma.korlepara

16 Sep 2008 6:46 AM

Hi Mike,

I am also planning to write 70-562 by this year end. Can you suggest me the best book which is useful for this exam

Many Thanks,

Sushma Korlepara.

Mike Ormond's Blog

More on Dynamically Loading ListView Templates

More on Dynamically Loading ListView Templates