Is there a list somewhere that lays out all of the types of changes that can be made to an existing workflow service that would prevent existing instances of the original workflow from being re-loaded? For example, I recently made a small change to a custom activity (changed a condition in an "if" statement) and all existing workflow instances still load as normal. Now, in the past, I had removed a property on an object that the workflow uses, and when I tried to re-load a persisted workflow instance, it blew up on me.
Does such a list exist? Thanks!
As far as I am aware there isn't a list like that. You really should consider all changes as breaking. If you test thoroughly you will find a few exceptions but these will be mostly changing a single VB expression.