I like the managed meta data browsing in SharePoint 2010 that you get against a library.

My wish to to put something like this into a web part and this has worked with one problem.

So going back to managed meta data browsing by library.

This is fulfilled by MetadataNavTree.ascx

Taking a peek at this gives us an idea to create this tree in a web part.

So in my visual web part I have.

<SharePoint:SPHierarchyDataSourceControl runat="server"
  ID="MMTreeViewDataSource"
  IncludeDiscussionFolders="false"
  ShowListChildren="true"
        />
 <OfficeServer:MetadataHierarchyDataSourceControl runat="server"
  ID="MetadataTreeViewDataSource"
  SPHierarchyDataSourceId="MMTreeViewDataSource"
        />
 <SharePoint:SPRememberScroll runat="server" id="TreeViewRememberScroll" onscroll="javascript:_spRecordScrollPositions(this);"
  style="overflow-y: auto; overflow-x: hidden;">
  <SharePoint:SPTreeView runat="server"
   ID="MMTreeView"
   ShowLines="false"
   DataSourceID="MetadataTreeViewDataSource"

Other stuff....

OnTreeNodeDataBound="MMTreeView_TreeNodeDataBound"   >
  </SharePoint:SPTreeView>
 </SharePoint:SPRememberScroll> 

And in my code behind I have.

        protected void Page_Load(object sender, EventArgs e)
        {

            // When the page is loaded ensure that data source is bound to the correct list
            MMTreeViewDataSource.RootListId = ucpListID;
            MMTreeViewDataSource.RootWebId = ucpWebID;
            MMTreeView.ExpandDepth = ucpExpandDepth;
           
        }

This deploys as a web part and renders the managed meta data structure configured against the list (identified by RootListID) perfectly.  I can then override OnTreeNodeDataBound and make the links generated do something useful.

The odd problem is that unless the web part is deployed to a page in the RootWeb then it does not render.

This is because OfficeServer:MetadataHierarchyDataSourceControl will not return results when used in the above manner unless in the rootweb.  I tried using rootwebid and rootlistids from the same web as I deploy the webpart in but to no avail.

Any suggestions?

Have you enabled metadata navigation in the other webs you're putting the webpart in?

Maybe this post will help: http://social.msdn.microsoft.com/Forums/sharepoint/en-US/bad86ce8-480b-4b73-af7f-50fb8955fb14/how-to-use-sphierarchydatasourcecontrol ?

Yes this is enabled in the sub webs.

• Hi Dave,

Greetings! Thanks for the post.

I have gone through the issue you described above and I do not see why you are facing the issue. To be able to troubleshoot and resolve your issue, I would request you to open a support ticket with Microsoft.

For more information about Microsoft Support please read the article http://support.microsoft.com/gp/proffaq/en-gb

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Thanks,

Bharat Rathod,

Microsoft Online Community Support