• New feature - Improved BSON performance
• New feature - Added WriteOid and WriteRegex to BsonWriter
• New feature - Added support for ShouldSerialize conditional methods
• New feature - Added TypeNameHandling to JsonProperty attribute. Allows a type names to be included on an individual property basis
• New feature - Support for reading octal and hexadecimal numbers from JSON
• New feature - Added support for enum values to LINQ to JSON
• New feature - Added TypeNameAssemblyFormat property to JsonSerializer
• New feature - Added DateTimeConverterBase
• New feature - Added JsonPrimitiveContract and JsonLinqContract
• New feature - Added CreateMemberValueProvider method to DefaultContractResolver
• New feature - INotifyCollectionChanged implemented on JContainer in Silverlight
• New feature - Included BSON in .NET 2.0, Silverlight and Compact Framework builds
• New feature - Added ReadRootValueAsArray, DateTimeKindHandling properties to BsonReader
• New feature - ISerializable support
• New feature - Added GetSchema, CanRead, CanWrite to JsonConverter
• New feature - LINQ to XML support added to XmlNodeConverter
• New feature - SerializeXNode, DeserializeXNode methods added to JsonConvert
• New feature - Added support for sharing a static cache for contract resolvers inheriting from DefaultControlResolver
• New feature - Added support for switching between dynamic and late bound reflection for medium trust environments
• New feature - Support for using implicit/explicit casts when converting a JSON property name to a dictionary value
• Change – JsonConverter.ReadJson method is now passed the existing value of the property it is converting
• Change - Built in JsonConverters are resolved once when the contract is created rather than runtime
• Change - JsonRaw removed and replaced with JRaw
• Change - Type is now always written as AssemblyQualifiedName
• Change - Dictionary key serialization falls back to ToString for keys
• Change - Schema generator now uses JsonContracts to determine schema information
• Change - Removed the "-" prefix when serializing a JSON constructor - prefix not compatible with XML naming standard
• Change - When converting JSON to XML using XmlNodeConverter, changed special JSON properties ($id, $ref, $type) to be attributes rather than child elements
• Fix - Fix dynamic code generation IL verification issues in .NET 4
• Fix - Fix error when deserializing nullable array
• Fix - Escape JSON property text
• Fix - Silverlight serialization security error
• Fix - Private base members marked with JsonProperty attribute now correctly serialized
• Fix - Error message when attempting to deserialize custom dictionary with no default constructor
• Fix - Correctly deserialize empty BSON objects
• Fix - When a class has a metadata class defined, fall back the original class from the metadata class when attribute not found
• Fix - Deserialize HashSet without error
• Fix - Correctly skip ignored JSON properties when deserializing via a non-default constructor
• Fix - Schema with no properties now correctly validates
• Fix - Dictionary and array schemas now marked as nullable
• Fix - Serialize generic dictionary that doesn't implement IDictionary correctly
• Fix - CustomCreationConverter no longer errors when writing JSON
• Fix - JsonProperty.Readable and Writable not being correctly set for .NET properties with modified getter/setter visibility
• Fix - Fix error caused by private properties on a base class when reflecting a type
• Fix - Correct property CanRead and CanWrite coming back as false when a base class property has a private getter/setter visibility
• Fix - Fix reading BSON multi byte UTF8 characters
• Fix - CustomCreationConverter to return null when converting a null JSON value
• Fix - Fix for possible errors caused by mutable GetHashCode implementations and reference tracking
• Fix - Fix JTokenReader.ReadAsBytes to read strings as base64 data