Problem using Include() when serializing Entity Framework 4 POCO classes with WCF?

Instead of trying to directly serialize the entity, try projecting to a DTO and serializing that. I agree what your seeing is bizarre behaviour - but it could be that the EF internal graph is taking over when your serializing the entities, but if you serialize a DTO, EF should not intervene.

The .Include() is used to include entities that are linked va FK relationships and the .Include() is passed the Name of the Navigation Property.

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