Rendering a Treeview Control

3 Apr 2006 6:17 PM

lumazi

Everyone,

     I'm having a bit of trouble with the Treeview control. Here's the
section of code I'm working with ...

StringBuilder defectCodeTreeSB = new StringBuilder();
TreeView defectCodeTreeView = new TreeView();
StringWriter defectCodeTreeSW = new StringWriter(defectCodeTreeSB);
HtmlTextWriter defectCodeTreeHW = new HtmlTextWriter(defectCodeTreeSW);
defectCodeTreeView.Nodes.Add(new TreeNode("TEST", "TEST"));
defectCodeTreeView.RenderControl(defectCodeTreeHW);

When I render the control I get the following error...

Object reference not set to an instance of an object.

on the line defectCodeTreeView.RenderControl(defectCodeTreeHW);

The stack trace is as follows ...

[NullReferenceException: Object reference not set to an instance of an
object.]
   System.Web.UI.Control.get_SpacerImageUrl() +59
   System.Web.UI.WebControls.TreeView.RenderBeginTag(HtmlTextWriter
writer) +146
   System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer)
+17
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer,
ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer,
ControlAdapter adapter) +121
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
   workwithexistingbatch.batchLookupButton_ServerClick(Object sender,
EventArgs e) in
d:\web\GTFWEBTEST\gtfASPX\QTS\workwithexistingbatch.aspx.cs:53
   System.Web.UI.HtmlControls.HtmlInputButton.OnServerClick(EventArgs
e) +105
   System.Web.UI.HtmlControls.HtmlInputButton.RaisePostBackEvent(String
eventArgument) +106
System.Web.UI.HtmlControls.HtmlInputButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String
eventArgument) +7
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler
sourceControl, String eventArgument) +11
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
+174
   System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
+5102

Has anyone run across this before?

Thank you in advance for your help !

Scott Vercuski

4 Apr 2006 4:50 PM

CaffieneRush@gmail.com

>Has anyone run across this before?

No but your error message looks like either SpacerImageUrl property or
a variable within SpacerImageUrl needs to be set.

Best regards.

11 Apr 2006 3:08 PM

rodrigosvcp

How do I set those parameters?

10 Apr 2006 6:58 PM

rodrigosvcp

Could you resolve this problem? I'm having exactly the same behavior
and don't know what to do.

11 Apr 2006 3:09 PM

rodrigosvcp

Could you resolve this problem? I'm having exactly the same behavior
and don't know what to do.