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

[Solved] Error loading tree from XML

1 Answer 159 Views

TreeView

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

Ed Bassin asked on 09 Jun 2008, 03:43 PM

I'm making something similar to this example--
http://www.telerik.com/demos/aspnet/prometheus/Panelbar/Examples/ApplicationScenarios/OutlookNavigation/DefaultCS.aspx

In the ASPX:

<telerik:RadTreeView ID="RadTreeView1" runat="server" MultipleSelect="True" Skin="Office2007" Height="213px" OnLoad="OnTreeLoad">
</telerik:RadTreeView>

In the C#:
protected void OnTreeLoad(object sender, System.EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            RadTreeView tree = (RadTreeView)sender;
            tree.LoadContentFile("xml/app_config.xml");
        }
    }

In the XML:
<?xml version="1.0" encoding="utf-8" ?>
<PanelItems>
</PanelItems>

This generates an error which comes from inside the treeview code:

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]

            Telerik.WebControls.RadTreeViewXmlParser.LoadFromXmlElement(XmlElement parentNodeElement, RadTreeNodeCollection nodeCollection, Int32 level) +29

            Telerik.WebControls.RadTreeViewXmlParser.LoadFromXml(String xmlString) +106

            Telerik.WebControls.RadTreeView.LoadContentFile(String path) +143

            MasterPage.OnTreeLoad(Object sender, EventArgs e) in c:\adminui\MasterPage.master.cs:47

            System.Web.UI.Control.OnLoad(EventArgs e) +99

            System.Web.UI.WebControls.DataBoundControl.OnLoad(EventArgs e) +46

            Telerik.WebControls.RadTreeView.OnLoad(EventArgs e) +37

            System.Web.UI.Control.LoadRecursive() +47

            System.Web.UI.Control.LoadRecursive() +131

            System.Web.UI.Control.LoadRecursive() +131

            System.Web.UI.Control.LoadRecursive() +131

            System.Web.UI.Control.LoadRecursive() +131

            System.Web.UI.Control.LoadRecursive() +131

            System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1436

[Solved] Error loading tree from XML

1 Answer, 1 is accepted