Attributes and WCF Web Service Load On Demand

[Tim]

On the server side, I've built a RadTreeView whose nodes have attributes.

RadTreeView tree = new RadTreeview();
tree.ID = "MyRadTree";
tree.WebServiceSettings.Path = "MyServices.svc";
tree.WebServiceSettings.Method = "GetNodes"
...
RadTreeNode nodes = new RadTreeNode();
...
RadTreeNode expandNode1 = new RadTreeNode();
expandNode1.Text = "Apples";
expandNode1.Value = "1";
expandNode1.Attributes.Add("NodeType", "Fruit");
expandNode1.ExpandNode = TreeNodeExpandNode.WebService;
...
tree.Nodes.AddRange(nodes);

My service, GetNodes(), is called, but the node.Attributes count is 0.

[OperationContract]
public RadTreeNodeData[] GetNodes(RadTreeNodeData node, IDictionary<string, object> context)
{
   string value = node.Value; // ok
   string text = node.Text; // ok
   int attributeCount = node.Attributes.Count; // 0
   string attribute = node.Attributes["NodeType"]; // Exception "The given key was not present in the dictionary"
}

Is this supposed to work?  Any ideas what I could be missing?  Might I need to add a [WebInvoke ...] attribute to my web method, perhaps changing the method style?

(Note that the attribute(s) are available from the client side; they just don't seem to make it through to the web service.)

Thanks.

[Tim]

Oh, I see. We're supposed to pass parameters to the web service through the "context" dictionary. But even though I seem to be populating it in OnClientNodePopulating, as explained in the online example, it still doesn't work.  The context remains empty.  Is this bug?

UPDATE: Hmmm... just found this 2-year-old thread.  Was this issue ever addressed?  If so, what version?

http://www.telerik.com/community/forums/aspnet-ajax/treeview/web-service-context-error.aspx

[Nikolay Tsenkov]

Hi Tim,

I have tested the scenario and it still reproduces with latest version.
I am going to log it and schedule it for fixing.

Please, accept our sincere apologies for the caused inconvenience.

Regards,
Nikolay Tsenkov
the Telerik team