- The main component responsible for loading add-ins is Add-In Loader AddinLoader.dll which gets installed with Visual Studio Tools for Office Runtime.
- When any Office client application starts it looks for all the add-ins registered in registry.
- The registry provides location of Application manifest file for each add-in.
- The Application manifest file contains mainly following information :
- Version of the add-in
- Location of Deployment manifest
- Version, location name of assemblies used by the add-in.
- If Deployment Manifest(DM) is mentioned, the version numbers of Application manifest(AM) and deployment manifest are compared. If DM is of newer version than AM, this means the add-in has been upgraded and new AM is loaded whose location is mentioned in DM.
- If no upgrade is required, add-in assemblies are loaded by the runtime.
- For each add-in, runtime creates a separate application domain to load assemblies. This provides better isolation.
- Add-in assemblies are executed and ready to receive inputs from users or event notifications from office application.
What's New in VSTO 2008 v3.0
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