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You can use strict change checking and introduce version tolerance by using the OptionalField attribute, which tells the BinaryFormatter class that objects that were serialized before the annotated field was added can still be safely deserialized. Listing 23-11 demonstrates the application of the OptionalField attribute to the Person class. Listing 23-11. Applying the OptionalField Attribute using using using using using System; System.IO; System.Runtime.Serialization; System.Runtime.Serialization.Formatters; System.Runtime.Serialization.Formatters.Binary;

[Serializable] class Person { private string name; private string city; [OptionalField(VersionAdded=2)] private int age; public Person(String nameParam, String cityParam, int ageParam) { name = nameParam; city = cityParam; age = ageParam; } public String Name { get { return name; } set { name = value; } } public String City { get { return city; } set { city = value; } } public int Age { get { return age; } set { age = value; } } } class Listing 11 { static void Main(string[] args) { // create a formatter IFormatter deserializer = new BinaryFormatter() { AssemblyFormat = FormatterAssemblyStyle.Full };

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// open the stream to the file Stream inputStream = File.OpenRead("person.bin"); // deserialize the object Person deserializedPerson = (Person)deserializer.Deserialize(inputStream); // print out the value of the fields of the deserialized object Console.WriteLine("Deserialized name: {0}", deserializedPerson.Name); Console.WriteLine("Deserialized city: {0}", deserializedPerson.City); Console.WriteLine("Deserialized age: {0}", deserializedPerson.Age); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The OptionalField attribute is in bold. The VersionAdded property is optional, but it can help you keep track of when you made which changes to serializable classes. With this attribute applied to the new field, the BinaryFormatter deserializes the Version 1 Person class and assigns the age field its default value; since the field is an int, the default value is 0. Compiling and running Listing 23-11 produces the following output: Deserialized name: Adam Freeman Deserialized city: London Deserialized age: 0 Press enter to finish

1. In the CSC business-to-business case, how were the top 10 prospects for each agent selected a. Agents were asked to select them. b. Existing customers were modeled. c. Prospects were surveyed. d. Prospect sales were modeled. e. D&B provided prospect purchase intentions.

SOAP, the Simple Object Access Protocol, is an XML format used for the exchange of structured information, and one of the serialization options supported by the .NET Framework is to serialize an object using this format. SOAP is a more verbose format than the binary output you produced in the previous section, but is more portable between different types of systems and somewhat more human readable. Here is an example of the output from serializing an object using SOAP: <SOAP-ENV:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:SOAPENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAPENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:clr="http://schemas.microsoft.com/soap/encoding/clr/1.0" SOAPENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"> <SOAP-ENV:Body> <a1:Person id="ref-1" xmlns:a1="http://schemas.microsoft.com/clr/assem/Listing 09%2C%20Version%3D1.0.0.0%2C%20Cultur e%3Dneutral%2C%20PublicKeyToken%3Dnull"> <name id="ref-3">Adam Freeman</name>

<city id="ref-4">London</city> </a1:Person> </SOAP-ENV:Body> </SOAP-ENV:Envelope> A lot of the output is information that the recipient of the serialized data can use to figure out the content of the SOAP message, but you can also see the type information for the serialized object (it was a Person object) and the field values (for the fields name and city) highlighted in bold.

Note The classes for SOAP serialization are in the System.Runtime.Serialization.Formatters.Soap assembly that must be added to your project before you can compile the examples in this section. Right-click on your project in the Solution Explorer window and select Add Reference. Click on the .NET tab of the Add Reference dialog box, scroll down until you find the System.Runtime.Serialization.Formatters.Soap assembly, and click OK.

Using SOAP serialization is very similar to using binary serialization, as demonstrated in Listing 2312. The Serializable attribute that you used for binary serialization is used in the same way for SOAP serialization. Listing 23-12. Using SOAP Serialization using using using using System; System.IO; System.Runtime.Serialization; System.Runtime.Serialization.Formatters.Soap;

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