WCF JSON Deserialization Issues with Whitespace?

This is a known issue which was fixed in the 4.5 framework. Unfortunately you essentially need to strip the white spaces from the front of the object if you want to use polymorphism in the current framework version. One way to do that is to read / write the JSON using a reader / writer created by JsonReaderWriterFactory as it will strip the white spaces (or any pretty printing) around the elements.

Unfortunately, I have no good answer to this. We ran into the same issue and contacted Microsoft about it. They insisted that what they were doing was okay because of performance concerns, which is laughable considering how the entire pipeline works.

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