Resuming workflow after workflow definition has changed in .NET 4

Question

In Workflow Foundation 4, what happens if I resume a persisted workflow, and in the meantime the workflow definition (eg, the xaml file) for that workflow instance has changed?

Will I get an error, will it resume with the old definition, or will it resume with the new definition?

Answer 1

It will generate an error. The only way to accomplish this now in WF4 is to store the old definition (XAML) somewhere and resume with that definition.

Microsoft is working on a workflow versioning implementation ( announced at PDC'10 ) but I'm not sure when that will be relased.

Here is a related question that may help you a little further.