System.ServiceModel 4.0.0.0 Implement the interface to create a formatter extension that controls the serialization of parameters into a message and the deserialization from a message into parameters in a service application. To insert the custom formatter into the service application, assign the object to the property using a behavior. Defines methods that deserialize request messages and serialize response messages in a service application. Method 4.0.0.0 System.Void To be added. Deserializes a message into an array of parameters. The incoming message. The objects that are passed to the operation as parameters. Method 4.0.0.0 System.ServiceModel.Channels.Message To be added. To be added. Serializes a reply message from a specified message version, array of parameters, and a return value. The serialized reply message. The out parameters. The return value.