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5
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It is a good practice to make all classes serializable even if you do not immediately require serialization. You should disable serialization for calculated and temporary members.
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Lesson Review
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You can use the following questions to test your knowledge of the information in Lesson 1, Serializing Objects. The questions are also available on the companion CD if you prefer to review them in electronic form.
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NOTE Answers
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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
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1. Which of the following are required to serialize an object (Choose all that apply.) A. An instance of BinaryFormatter B. File permissions to create temporary files C. Internet Information Services D. A stream object 2. Which of the following attributes should you add to a class to enable it to be serialized A. ISerializable B. Serializable C. SoapInclude D. OnDeserialization 3. Which of the following attributes should you add to a member to prevent it from being serialized by BinaryFormatter A. NonSerialized B. Serializable C. SerializationException D. SoapIgnore
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Lesson 1: Serializing Objects
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4. Which of the following interfaces should you implement to enable you to run a method after an instance of your class is serialized A. IFormatter B. ISerializable C. IDeserializationCallback D. IObjectReference
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5
Serialization
Lesson 2: XML Serialization
XML is a standardized, text-based document format for storing application-readable information. Just as HTML provided a text-based standard for formatting humanreadable documents, XML provides a standard that can be easily processed by computers. XML can be used to store any type of data, including documents (the latest version of Microsoft Office stores documents using XML), pictures, music, binary files, and database information. The .NET Framework includes several libraries for reading and writing XML files, including the System.Xml.Serialization namespace. System.Xml.Serialization provides methods for converting objects, including those based on custom classes, to and from XML files. With XML serialization, you can write almost any object to a text file for later retrieval with only a few lines of code. Similarly, you can use XML serialization to transmit objects between computers through Web services even if the remote computer is not using the .NET Framework.
After this lesson, you will be able to:
Serialize and deserialize objects using XML serialization. Customize serialization behavior of custom classes to meet specific requirements, such as an XML schema. Serialize a dataset.
Estimated lesson time: 40 minutes
Why Use XML Serialization
Use XML serialization when you need to exchange an object with an application that might not be based on the .NET Framework, and you do not need to serialize any private members. XML serialization provides the following benefits over standard serialization:
Greater interoperability XML is a text-based file standard, and all modern devel-
opment environments include libraries for processing XML files. Therefore, an object that is serialized by using XML can be easily processed by an application written for a different operating system in a different development environment.
More administrator-friendly Objects serialized by using XML can be viewed and
edited by using any text editor, including Notepad. If you are storing objects in files, this gives administrators the opportunity to view and edit the XML file. This
Lesson 2: XML Serialization
can be useful for customizing your application, troubleshooting problems, and developing new applications that interoperate with your existing application.
Better forward-compatibility Objects serialized by using XML are self-describing
and easily processed. Therefore, when the time comes to replace your application, the new application will have an easier time processing your serialized objects if you use XML. Additionally, you must use XML serialization any time you need to conform to a specific XML schema or control how an object is encoded. XML cannot be used for every situation, however. Specifically, XML serialization has the following limitations:
XML serialization can serialize only public data. You cannot serialize private data. You cannot serialize object graphs; you can use XML serialization only on objects.
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