topic Re: Error instancing a FileGDBWorkkspaceFactotyClass in ArcObjects SDK Questions

Error instancing a FileGDBWorkkspaceFactotyClass

PedroAbreu — Thu, 07 Oct 2010 14:32:52 GMT

Hi,

With ArcGIS Desktop 10, Sometimes this line of code:

IWorkspaceFactory factory = new FileGDBWorkspaceFactoryClass();

throws this exception:

Unable to cast object of type System.__ComObject to type ESRI.ArcGIS.DataSourcesGDB.FileGDBWorkspaceFactoryClass

I'm puzzled... Anybody has experienced this yet?

Re: Error instancing a FileGDBWorkkspaceFactotyClass

NeilClemmons — Thu, 07 Oct 2010 14:37:23 GMT

If you're running this code in a standalone application then you need to check out a license prior to running any ArcObjects code. You also shouldn't be using New to create an instance of the workspace factory. A workspace factory is a singleton object and should be instantiated using the Activator class.

http://help.arcgis.com/en/sdk/10.0/arcobjects_net/conceptualhelp/index.html#/Interacting_with_singleton_objects/00010000043p000000/

Re: Error instancing a FileGDBWorkkspaceFactotyClass

PedroAbreu — Wed, 13 Oct 2010 16:37:57 GMT

Neil,

I've been coding ArcObjects for so many years, and never had a problem with instancing Workspaces Factories with the "new" keyword.
But there's always a first for everything, and this was my first.

Thank you for your help 😉

Re: Error instancing a FileGDBWorkkspaceFactotyClass

Vidar — Thu, 12 Dec 2019 13:34:36 GMT

Thank you Neil - you've helped me on and off for 20 years now!!

Re: Error instancing a FileGDBWorkkspaceFactotyClass

NattawutWiginiyatanee1 — Fri, 21 Aug 2020 16:33:37 GMT

Yep! Thank you. this helped. But I still wonder most of my projects. this code won't break.

IWorkspaceFactory factory = new FileGDBWorkspaceFactoryClass();  ‍

But for my current project it breaks. And Neil Clemmons answer solves the problem.