Posts Tagged ‘VSTO’

VSTO Design-Time Adaptor error

August 17, 2009

When working with VSTO and creating a new Excel 2007 Workbook project, I got an error that the VSTO Design-Time Adaptor for Excel 2007 was corrupt or unavailable. Just before repairing the install, as is advised, I had a quick check of the Task Manager, and noticed that an Excel.exe process was still running. Ended this process, and hey presto, it fixed the problem.

It appears that sometimes when debugging/running your project, if it fails or stops before the Excel app gets closed by your code, the design time adaptor hangs. This happened to me because an Automation Excetuable had left an instance of Excel up and running in visible = false mode.