Runtime mapping

[cjmairair]

You need to look at the runtime type of the source members and use that.

This goes for the initial source object, and all of its inner descendants.
You can't just say, "well I don't know what to do if the source (declared) type is abstract or an interface". You have to look at the runtime type of the source object and use that type.

[Saratsin]

dynamic actually solving this problem