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The server method 'LoadNodes' failed

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This is a migrated thread and some comments may be shown as answers.

Wouter asked on 20 Apr 2011, 12:16 PM

Hi,

When I tried to expand my nodes in my RadTreeView I get the following error: 'The server method 'LoadNodes' failed'

I've placed a RadTreeView on a UserControl, in the Page_Init the UserControl is initialized.

Control control = LoadControl("/Pages/Controls/MenuControl.ascx");

control.ID = "menuControl";

panelMenu.Controls.Add(control);

Now the RadTreeView is defined as following:

<telerik:RadTreeView ID="radTOC" runat="server" Width="250px" Visible="false" CssClass="RadTreeView_RadSkins"

EnableEmbeddedSkins="False" ShowLineImages="false" Style="white-space: normal;">

<WebServiceSettings Path="../../Services/TreeViewService.asmx" Method="LoadNodes" />

</telerik:RadTreeView>

The treenodes are added to the RadTreeView as following:

foreach (Publication sub in subPublications)

{

RadTreeNode treeNode = new RadTreeNode(sub.Name, sub.PublicationID.ToString());

treeNode.ExpandMode = TreeNodeExpandMode.WebService;

radTOC.Nodes.Add(treeNode);

}

The webmethod in TreeViewService.asmx:

[System.Web.Script.Services.ScriptService]

public class TreeViewService : System.Web.Services.WebService

{

[WebMethod]

public static RadTreeNodeData[] LoadNodes(RadTreeNodeData node, object context)

{

List<RadTreeNodeData> result = new List<RadTreeNodeData>();

RadTreeNodeData nodeData = new RadTreeNodeData();

nodeData.Text = "Loaded on demand";

nodeData.ExpandMode = TreeNodeExpandMode.WebService;

result.Add(nodeData);

return result.ToArray();

}

Does anyone know what I'm doing wrong?

Regards,
Wouter splinter

6 Answers, 1 is accepted

answered on 29 Apr 2011, 12:23 PM

Hi Helen,

With fireBug I will get the following error: 500 Internal Server Error

Server Error in '/' Application.

Unknown web method LoadNodes.
Parameter name: methodName

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: Unknown web method LoadNodes.
Parameter name: methodName

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


            [ArgumentException: Unknown web method LoadNodes.
Parameter name: methodName]
   System.Web.Script.Services.WebServiceData.GetMethodData(String methodName) +526258
   System.Web.Script.Services.RestHandler.CreateHandler(WebServiceData webServiceData, String methodName) +10
   System.Web.Script.Services.RestHandler.CreateHandler(HttpContext context) +152
   System.Web.Script.Services.RestHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated) +62
   System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated) +47
   System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig) +203
   System.Web.MapHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +128
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1

I will hope you can solve this issue.

Regards,
Wouter

Accepted

The server method 'LoadNodes' failed

6 Answers, 1 is accepted

Server Error in '/' Application.

Unknown web method LoadNodes. Parameter name: methodName

Unknown web method LoadNodes.
Parameter name: methodName