I have just discovered the very useful xdExtension keyword which allows you to execute code directly from a form rule. However any nodes passed into the called function are of type ComObject and there doesn't seem to be a way to cast them into an XPathNavigator or other useful construct from within C#.
Rule condition:
xdExtension:Myfunction(../my:Node)
This should allow me to manipulate the passed node in C#, but instead I just get a ComObject that can't be cast to anything.
Is there any way to pass something that C# can identify as an XPathNode?
