Extra Tips for Debugging SharePoint Timer Jobs
There is an excellent guide over on MSDN on how to debug a SharePoint timer job from Visual Studio. However, it fails to mention that sometimes you need to restart the service that runs the timer jobs to allow debugger to set a breakpoint. In addition, sometimes a job will not show up in the job definitions list (Central Administration – Job Definitions), making it hard to manually start a job. The solution to this is to recycle IIS.
The simplest way to incorporate this into a development workflow is to add it to these commands to the Pre- and Post-deployment Command Line steps in Visual Studio:
Pre-deployment Command Line:
net stop SPTimerV4
Post-deployment Command Line:
net start SPTimerV4 iisreset
Hope this helps.