StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POPopulateOnDemand does not work on data bound ASP.Net TreeView
primarykey
Id
2355156
data
AcceptedAnswerId
2401347
AnswerCount
3
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2010-03-01T10:37:40.823
FavoriteCount
3
LastActivityDate
2013-05-29T17:27:14.637
LastEditDate
2010-03-05T14:14:11.883
LastEditorUserId
104775
OwnerUserId
104775
ParentId
0
PostTypeId
1
Score
1
ViewCount
3560
LastEditorDisplayName
text
Body
<p>I have a TreeView that is bound to a XmlDataSource control. I've added some TreeNodeBinding elements to define how I want the XML data to be shown.</p> <p>I have also added PopulateOnDemand=true to these TreeNodeBindings. However, doing so didn't change a thing and the entire XML tree is displayed. Moreover, the TreeNodePopulate event is not fired on node expand as well.</p> <p>Important information: I'm using ASP.NET 4.</p> <p>This is an example that reproduces the problem (very straight forward):</p> <pre><code><%@ Page Language="C#" AutoEventWireup="true" %> <script type="text/C#" runat="server"> protected void TreeView1_TreeNodePopulate(Object sender, TreeNodeEventArgs e) { // This method is never called... } </script> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> <asp:TreeView ID="TreeView1" runat="server" DataSourceID="XmlDataSource1" OnTreeNodePopulate="TreeView1_TreeNodePopulate" ExpandDepth="0"> <DataBindings> <asp:TreeNodeBinding DataMember="#" TextField="#" ValueField="#" PopulateOnDemand="true" /> </DataBindings> </asp:TreeView> <asp:XmlDataSource ID="XmlDataSource1" runat="server" DataFile="Sample.xml" /> </div> </form> </body> </html> </code></pre> <p>The Sample.xml can be any xml file you want, it doesn't really matter.</p> <p>I tried to put a breakpoint within the <code>TreeView1_TreeNodePopulate</code> method and it was never hit.</p> <p>I also tried to:</p> <ul> <li>Set a TreeNodeBinding for each possible data member with PopulateOnDemand="true".</li> <li>Via code, go through all tree nodes and set their PopulateOnDemand property to <code>true</code>.</li> </ul> <p>Nothing worked.</p> <p>The only way the populate-on-demand thing worked was when I added nodes manually to the nodes instead of binding it to a data source.</p> <p>What am I doing wrong?</p>
Tags
<asp.net><data-binding><treeview>
Title
PopulateOnDemand does not work on data bound ASP.Net TreeView
singulars
PostAcceptedAnswerId
1. PO
  singulars
  PostTypePostTypeId
  PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USShay Friedman
UserOwnerUserId
1. USShay Friedman
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
  singulars
  PostTypePostTypeId
  PTAnswer
2. PO
  singulars
  PostTypePostTypeId
  PTAnswer
3. PO
  singulars
  PostTypePostTypeId
  PTAnswer
VotesPostIdCreationDate
1. VO
  singulars
  PostPostId
  POPopulateOnDemand does not work on data bound ASP.Net TreeView
  UserUserId
  USShay Friedman
  VoteTypeVoteTypeId
  VTBountyStart
2. VO
  singulars
  PostPostId
  POPopulateOnDemand does not work on data bound ASP.Net TreeView
  UserUserId
  USJohnIdol
  VoteTypeVoteTypeId
  VTFavorite
3. VO
  singulars
  PostPostId
  POPopulateOnDemand does not work on data bound ASP.Net TreeView
  UserUserId
  This table or related slice is empty.
  VoteTypeVoteTypeId
  VTUpMod
CommentsPostId
1. COcan you show: 1) markup 2) the code behind if you're implementing the OnTreeNodePopulate event handler
  singulars
  PostPostId
  POPopulateOnDemand does not work on data bound ASP.Net TreeView
  UserUserId
  USJohnIdol

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.