Does Marking Objects As Serializable Incur Overhead?

Question

If I add the [Serializable] attribute to a class, does this introduce any overhead? How about if the class is never used in any serialization operations?

Answer 1

This doesn't add any overhead to the normal runtime use of the object.

Marking a class as Serializable doesn't even result in a size difference in metadata. It just sets a bit in the typedef flag. (Thanks to thecoop for pointing that out)