Hello,

I'm using the config component to on the module's .DNN file to add/update configurations on the web.config file.
e.g. I have this:


This works fine on most installations.
The problem is when someone has a not-standard DNN web.config file, e.g. when they have this:

  <location inheritInChildApplications="false"> 
    <system.web>
    .....
    </system.web>
  </location>

In this case, the install crashes with an ExceptionSystem.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Services.Installer.XmlMerge.UpdateNode(XmlNode rootNode, XmlNode
actionNode) in C:\Builds\Maintenance\WorkingDirectory\Library\Services\Installer\XmlMerge.vb:line 340 at....

Questions:
1) Can I update somehow the .DNN code find above to avoid this crash? That is, ignore the configuration change request, if the path is not found (e.g. "/configuration/system.web/httpHandlers")?
2) Can I add an additional conditional configurations, to be able to update the target web.config files also when the path is like /configuration/location/system.web/httpHandlers (or whatever it could be)?

Thanks,
Horacio.-

PS: Info about the config component could be found here: http://www.dotnetnuke.com/Resources/Wiki/tabid/1409/Page/Manifest-Component-Installers-The-Config-Component/Default.aspx

The inclusion of a <location> element in the web.config is a known issue that similarly affects core updates such as the processing of the Net40.config file when .Net 4.0 is detected. There is a Gemini issue logged concerning that particular issue (DNN-14940) but as you have found a more generalized solution to catch the now unhandled null reference error and to then retry the web.config modification with location included in the XPath needs to be implemented in core XmlMerge code.

As for a fix in your case I don't see one that does not involve a core code change in either the installer or XmlMerge class or avoiding use of the config component in the manifest.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
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Horacio

Thank you for your comment. In generally we did not have problems like you have described, but it has sense. Can you post here in case you find much better solution?

Thanks

Sergey

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