Category / Sharepoint 2010

by Simon Doy

SharePoint Feature Receiver token replacement only works with Guids using lower case characters


Introduction

This week I have been writing my first proper SharePoint 2010 Service Application.

Part of that solution is using a Feature Receiver to install the various components that make up a Service Application. These include:-

  • Service
  • Service Proxy
  • Service Application
  • Service Application Proxy
  • Service Instance

Tip: Andrew Connell’s chapter in the Real World SharePoint 2010 book is an excellent resource for getting the plumbing of the service application setup.

One of the issues came about at deployment time. Now that I write this, I do remember hearing about this issue before when during a SharePoint 2010 Developer Bootcamp. Of course I didn’t take enough notice and then hit the problem when I decided to update the GUID for the feature receiver.

The following error was displayed when deploying the solution:-

Error occurred in deployment step ‘Add Solution’: Failed to create receiver object from assembly “ITSP.SPMonitoringStatusPackage, Version=1.0.0.0, Culture=neutral, PublicKeyToken=de085cbd57463aa2”, class “$SharePoint.Type.edd0669b-2393-4fe6-988d-17a2De06c6e4.FullName$” for feature “ITSP.SPMonitoringStatusPackage_ITSP.SPMonitoringStatusInstaller” (ID: a5ede1b3-cbd6-4918-9f31-4322603295f5).: System.ArgumentNullException: Value cannot be null.
Parameter name: type
at System.Activator.CreateInstance(Type type, Boolean nonPublic)
at Microsoft.SharePoint.Administration.SPFeatureDefinition.get_ReceiverObject()

Screenshot:-

guid-featurereceiverdeployerror

The deployment show that any error occured because it could not create a feature receiver object from assembly “ITSP.SPMonitoringStatusPackage, Version=1.0.0.0, Culture=neutral, PublicKeyToken=de085cbd57463aa2” with the class “$SharePoint.Type.{GUID}.FullName$”.

The token, “$SharePoint.Type.{GUID}.FullName$”, should be replaced by Visual Studio as part of the build process. However this does not seem to happen with the GUID value that I was using (see below).

In this example the {GUID} value is specified against the feature receiver class using an attribute as below (please note the capital letters have been added for this example):-

guid-featurereceiveruppercase

The item that uses this GUID attribute for the Feature Receiver Class can be seen by double-clicking on the feature Visual Studio SPI object:-

featureceiver-spi

If you then look at the properties of the feature Visual Studio SPI object, you see the section as below:-

featureceiver-spi-properties

As you can see the Receiver Class has a value of:-

$SharePoint.Type.edd0669b-2393-4fe6-988d-17a2De06c6e4.FullName$

 

Solution

The issue is that upper case characters are being used and changing these to use lower case alphabetic characters for the GUID fixes the issue.

The following changes need to be made.

  1. Change the Feature Receiver’s GUID attribute.
 1: [Guid("edd0669b-2393-4fe6-988d-17a2de06c6e4")]

 

 2:     public class ITSPSPMonitoringStatusInstallerFeatureReceiver : SPFeatureReceiver

 

2. Update the Feature Receiver Visual Studio SPI object’s Receiver Class property to:-

featureceiver-spi-properties-fixed

Save all the files, rebuild, deploy and the solution is deployed successfully, hurrah!

feature-installed-successfully

 

Hope that helps.

by Simon Doy

Issue with Updating SharePoint Publishing Page Layouts and Ghosting


Introduction

This post has come about due to some challenges when upgrading a publishing site page layout.

Before we delve into the issues I best explain how the Page Layouts are setup. The page layouts are all contained within a feature called “Company.Intranet.Publishing” which are deployed to the folder:

SharePointRoot\Template\Features\Company.Intranet.Publishing\PageLayouts.

Each of the page layouts are deployed into the master page gallery (/_catalogs/masterpages) using a Module. The page layouts are deployed as uncustomised or ghosted files.

The fact these resources are deployed as ghosted files is very important as you will see in the next section.

Finally the feature is deployed using the SharePoint Solution framework as a single SharePoint WSP using WSP Builder.

What do you mean by Ghosted / UnCustomised files?

There has been quite a lot of information published about this and the following are good resources:-

My understanding is that a ghosted file is where the binary content is actually stored on the file system of the server and a pointer to that binary content is held in the content database. If a user modifies the content of a page layout in a site collection by a tool such as SharePoint Designer then a copy of that binary content is taken from the file system and merged along with the changes made by the user and stored in the content database.

Hence when you retrieve an uncustomised file its binary content is being pulled from the content database.

Why are Ghosted / Uncustomised files preferred?

Recently at the SharePoint Best Practices conference, Eric Shupps and Rob Foster did a great presentation on Fine Tuning and Optimising SharePoint Performance. One of the key points in improving performance is to ensure that files are ghosted/uncustomised for the following reasons:-

  • Ghosted files all point to a single file and hence they all point to the same binary content. This means only one file needs to be cached and the load on the database is significantly reduced.
  • Actually Unghosted files cannot be cached within a BlobCache. Unghosted files are therefore slower to load and render (10% slower on average) than a ghosted file.

Upgrading Page Layouts

The method used to upgrade page layouts is simply by redeploying the files through an updated wsp solution file. We have also been careful through training and guidance with users to ensure that page layouts are not edited through SharePoint Designer.

Therefore if a change to a page layout is required, then the page layout is updated within the feature directory using Visual Studio and the WSP solution file is rebuilt.

The solution is then ready to be updated using the command:-

stsadm –o upgradesolution –filename [solutionname.wsp] –name [solutionname.wsp] –allowgacdeployment –allowcaspolicies –immediate

The change to the page layout is then reflected within the SharePoint site.

Why are my changes are not seen?

More history, our last deployment required that we tidied up the page layout’s title and description.

One of the problems with using a Module to deploy files within a feature is that with SharePoint 2007 it is difficult to make changes to existing files deployed by a module without resorting to code. Any changes to the filenames or properties that are deployed by the Module are not reflected until the file is deleted from the site collection.

As there were not that many site collections, we took the decision not to write any code and we modified the page layout titles and descriptions through the SharePoint UI.

Unfortunately when we did our next release into our testing environment the changes to the page layout markup were not seen within the site.

After checking that the page layouts were being deployed correctly to the the WFE’s file system we started thinking of the reason. Finally I thought it must be due to unghosting of the files.

Normally you can use SharePoint Designer to revert page layouts to their site definition. So I fired up SharePoint Designer and browsed to the /_catalogs/masterpages document library but could see that the Page Layouts were not customised.

I started to search for tools to find out which files are customised. The legendary Gary LaPointe (@glapointe) came to the rescue.

If you don’t deploy Gary LaPointe STSADM tools on your Production/UAT environments then I plead with you that you start to do so as soon as possible. Time and time again I have been in a bind and Gary’s STSADM commands have got me out of trouble.

The commands that saved the day this time are:-

The commands give a lot of flexibility, though I will warn you that you need to be a bit careful as you could quickly reghost all the files within your site collection if you are not careful.

I performed the following command:-

stsadm –o gl-enumghostedfiles –url http://sharepointsite.domain.com/

This displayed a list of files that were unghosted. Funnily enough all the page layouts that we had modified and changed their Title and Description fields had become unghosted!

Once we had a list of the unghosted page layouts we could reghost each of them in turn using the command:-

stsadm –o gl-reghostfile –url http://sharepointsite.domain.com/_catalogs/masterpage/RandomPageLayout.aspx –Scope File

This command would reghost each of the files, there were occasions where the page layout reghosting would fail, using the –force option for the gl-reghostfile would ensure that the page was ghosted.

Now looking at the site the page layouts had been updated and reflected the changes that had been deployed by the update solution.

Hope that helps!