From the Desk of Brandon Haynes

I recently wrote about implementing a custom PageFlow navigation provider in the WCSF library.  Since then, the patterns team has broken out the PageFlow block into a separate package (formally the “Patterns & Practices: Web Client Software Factory Contrib“).

Since my existing PageFlow navigation provider-related modifications became obsolete with this change, I thought I’d spend a few minutes porting my changes to the new block.  I actually completed this task a couple of months ago, but have just now found the time to post it publicly.  Thanks to those who persevered in prodding me to put it online!

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In my previous post, I discussed my reasons and motivations behind providing DotNetNuke assemblies with debug symbols to the general public.  Herein, visitors will find links to those files and instructions for generating a call stack with file names and line numbers.

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During my time working with DotNetNuke, I have encountered innumerable forum posts in the following general form:

I’m getting a very vague general exception error, and I’m not sure what is causing it.  There doesn’t seem to be anything visible in the application . . . [and] no errors as I’m navigating the site. Any and all help is greatly appreciated!

StackTrace: [NullReferenceException: Object reference not set to an instance of an object.]
   DotNetNuke.UI.Skins.SkinDefaults..ctor(SkinDefaultType DefaultType) +189
   DotNetNuke .Common.Globals.get_DefaultSkin() +31
   DotNetNuke.Entities.Portals.PortalSettings.GetPortalSettings(Int32 TabId, PortalAliasInfo objPortalAliasInfo) +2797
   DotNetNuke.Entities.Portals.PortalSettings..ctor(Int32 tabId, PortalAliasInfo objPortalAliasInfo) +82
   DotNetNuke.HttpModules.UrlRewriteModule.OnBeginRequest(Object s, EventArgs e) +3303
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64

Experienced DNN developers will recognize the general area in which the error is occurring (missing skinningDefaults in DotNetNuke.config) and probably some general guidance to rectify the error (check that DotNetNuke.config exists, and correctly contains the proper skinningDefaults element).

This is fine for exceptions that occur frequently, but how does an experienced developer guide a novice in finding a solution to this issue?

[NullReferenceException: Object reference not set to an instance of an object.]
   DotNetNuke.HttpModules.UrlRewriteModule.RewriteUrl(HttpApplication app) +378
   DotNetNuke.HttpModules.UrlRewriteModule.OnBeginRequest(Object s, EventArgs e) +1180
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64

Even a sophisticated developer would need to explore several avenues in finding a solution.  Assisting a relatively novice forum user in performing these tasks is problematic — such assistance would require a number of back-and-forth exchanges.  With regret, I unfortunately observe many problems go unremedied for this reason (as, to date, is the exception posted immediately above). (more…)