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Dynamic TreeView XML Error in C#

Posted on 2005-04-12
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Last Modified: 2008-01-09
I'm using the standard TreeView control in an aspx page. I'm trying to load the contents of the tree from an xml file. This works fine when I use a static xml file (test.xml):

<iews:TreeView runat="server" AutoPostBack="true" ID="Treeview1">
<iews:treenode Text="test.xml" TreeNodeSrc="/Controls/test.xml" >
</iews:treenode>
</iews:TreeView>

Unfortunately, I need to create the xml dynamically, so I'm trying to generate it with an aspx page (test.aspx), and load it like this:

<iews:TreeView runat="server" AutoPostBack="true" ID="Treeview1">
<iews:treenode Text="test.xml" TreeNodeSrc="/Controls/test.aspx" >
</iews:treenode>
</iews:TreeView>

When I use test.aspx, I get an error:

"System.Exception: The XML loaded from TreeNodeSrc=http://localhost/SkyArc/Players/Controls/test.aspx, TreeNodeXslSrc= did not contain the required outer <TREENODES> container."

I have copied the output from test.aspx into test.xml, so if I point my browser directly at each file, their source looks IDENTICAL:

<?xml version="1.0" encoding="utf-8" ?>
<TREENODES>
      <treenode Text="363 Market" CHECKBOX="true" ></treenode>
      <treenode Text="363 Market" CHECKBOX="true" ></treenode>
      <treenode Text="Ohio" CHECKBOX="true" ></treenode>
</TREENODES>

One more thing: I've loaded test.aspx into the TreeView sample project and pointed the tree at it in the same way. It worked fine. I feel like I'm taking crazy pills! Why should my other project be any different?

Is this a Page.Response.ContentType kind of issue? I've looked all over the internet for this error, and have found discussions about it in many places... and it's never actually solved. Any thoughts?

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Question by:juicemonger
  • 3
5 Comments
 
LVL 25

Expert Comment

by:nauman_ahmed
ID: 13766021
Try the following for the aspx XML page:

Page.Response.ContentType = "application/xml"

HTH, Nauman.
0
 

Author Comment

by:juicemonger
ID: 13767031
Nauman,
   I had tried setting ContentType to "text/xml", but neither that nor your suggestion made any difference.

I've noticed something new: I expect test.aspx to be generated when I expand the parent node. In fact, I placed a breakpoint in the codebehind Page_Load() and found that it is never reached when I expand the parent node. I see the error page before Page_Load is called. Of course, if I point the browser directly at test.aspx, Page_Load() is called (and broken) immediately.
0
 

Author Comment

by:juicemonger
ID: 13774241
Is it possible that it's a permissions issue? My web app requires a username and password. If I am not logged in, I cannot point my browser directly at test.aspx -- I am redirected to the login page. The error page I've been seeing indicates that I'm seeing a server issue, not a browser issue - is it possible that the server is looking for the page from a port (or something) that is not logged into the system and is thus not granted proper access?
0
 

Author Comment

by:juicemonger
ID: 13776308
Wooooooooooooooo! Solved it. After 3 days.

When the TreeView Control requested test.aspx, it was doing so without authorization, so it was being redirected to the login page. I added:

<configuration>
  <location path="test.aspx">
    <system.web>
      <authorization>
        <allow users="?" />
      </authorization>
    </system.web>
  </location>
<configuration>

...to Web.config and everything worked.

So... tell me a joke and... win 500 points?
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