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Backward compatibility of SharePoint 2010 object model

Posted By: Destin Joy     Category: Sharepoint 2010     Views: 4072

In this article I am describing about the backward compatibility of SharePoint 2010 object model. Some of my readers asked me about it.I hopes this will give some idea to them. Most of the organization is migrating from older version of SharePoint to SharePoint 2010.In this context this article will be of great help

This article provides guidance to help you to dazed challenges that you might find as you redeploy, test, and debug your Windows SharePoint Services 3.0 and Office SharePoint Server 2007 code in SharePoint Foundation 2010 and Microsoft SharePoint Server 2010, respectively. Microsoft SharePoint Foundation 2010 and Microsoft SharePoint Server 2010 contain object model upgrades but that are be compatible with existing solutions developed for Windows SharePoint Services 3.0 and Microsoft Office SharePoint Server 2007. But some namespaces, classes, and methods are now outdated. Any way they are still available and will continue to work as expected. We can synchronize customizations and applications with the upgraded versions of SharePoint 2010 once we redeployed them.

We have to rewrite and recompile the code that refers to files in "12" hive folder. You have to redeploy the files from 12 hive folder to “14" folder. Because any reference that made to dlls or resources under the 12 folders won’t work with 14 folder structure. You have t recompile custom code written for Windows SharePoint Services 3.0 and Office SharePoint Server 2007 that does not run on IIS . You should recompile custom code written for Office SharePoint Server 2007 if your solution includes a feature receiver that implements the FeatureInstalled, FeatureUninstalling, FeatureActivated, or FeatureDeactivating methods and you are deploying by using either the Stsadm command-line tool or the timer service.

We can look at some of the custom solution files that we need to move in to SharePoint 2010

Solution Packages (.WSP Files)

Please make sure you deploy your custom solutions by using solution packages (.wsp files), because this is the best way to ensure that all of your custom files are deployed to the correct locations. But before you deploy wsp file make sure you don’t have any reference to 12 hive folder. This is changes to 14 folder

Windows Installer Files

If you deploy your custom solutions by using Windows Installer (.msi) packages, ensure that you change them so that your custom files are deployed to their correct locations in the "14" folder, especially if you are deploying files to locations other than the TEMPLATE\FEATURES folder.Here you don’t have to recompile the files if you don’t have files referencing to 12 hive

Site Template Redeployment

Site templates are condemned. If you need to redeploy a site template to either SharePoint 2010 follow the below steps

  1. Create a site from the site template.
  2. Install SharePoint Foundation 2010 or SharePoint Server 2010 on your existing server farm or on a new server farm. If you install the upgrades on a new server farm, attach the content database that contains the site that you created to the new farm.
  3. On the new installation, on the Site Settings page, select Save Site as Template. This creates a solution package with a .wsp file name extension.

Obsolete Classes and Namespaces

Because the changes to the API in the upgrades are backward compatible, we don’t have to make any changes 2007 custom solutions before you redeploy them 2010 version of SharePoint0. Some classes and namespaces are obsolete, but they will continue to work as expected. If you want to start upgrading your applications so that they use the most current classes and methods, recompile your code. The compiler warnings will tell you which elements of the object model are obsolete, and which newer alternatives you should use. Figure 3 shows an example compiler warning and the corresponding mouse-over warning in Visual Studio 2010.

Event handler

You need to recompile and redeploy it

Master page and Themes

2007 themes are not Themes no longer exist in SharePoint 2010 so any customizations and design work that we done with you have done with themes will not be imported into the new version


Script should work with 2010.But we should check whether it relevant with new UI changes

32 Bit dlls

Dlls that support 32 bit application no longer going to support in SharePoint 2010 as it is designed to work in 64bit.


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Destin Joy
Destin Joy author of Backward compatibility of SharePoint 2010 object model is from Pathanamthitta, India. Destin Joy says

 Hello Everyone,

I am Destin Joy from India I have MCPD in SharePoint 2010, MCTS SharePoint 2010 application development and MCTS in SharePoint 2007. I am mostly working in  core part of SharePoint (2010-2007) and passionate about new Microsoft technologies. Born and brought up in Kerala You can reach me  @ Destin.Joy@hotmail.com


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