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see if it s really an IceCream or a Cake Now when you serialize the DessertMenu shown in listing 2- 17, you get the XML shown in listing 2-18 Note that each menu item has an xsi:type attribute indicating the type of that item Listing 2-2-17 The Dessert classes with XML serialization attributes added
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'Dessert is the base class 'Use XmlInclude to indicate other types 'that inherit from Dessert <XmlInclude(GetType(IceCream)), XmlInclude(GetType(Cake))> _ Public Class Dessert Public Calories As Long End Class 'IceCream inherits from Dessert Public Class IceCream Inherits Dessert Public Flavor As String End Class 'Cake inherits from Dessert Public Class Cake Inherits Dessert Public IsChocolate As Boolean End Class
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'This is the class we will serialize Public Class DessertMenu Public Item1 As Dessert Public Item2 As Dessert Public Item3 As Dessert Public Sub New() 'Code omitted that
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'puts IceCream in items 1 and 2 'puts Cake in item 3 End Sub End Class
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Listing 2-2-18 The serialized DessertMenu object
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<DessertMenu xmlns:xsi="http://wwww3org/2001/XMLSchema-instance" xmlns:xsd="http://wwww3org/2001/XMLSchema"> <Item1 xsi:type="IceCream"> <Calories>3000</Calories> <Flavor>Oreo cookie</Flavor> </Item1> <Item2 xsi:type="IceCream"> <Calories>3000</Calories> <Flavor>Oreo cookie</Flavor> </Item2> <Item3 xsi:type="Cake"> <Calories>4000</Calories> <IsChocolate>true</IsChocolate> </Item3> </DessertMenu>
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While you can easily serialize polymorphic types, XML serialization does not support interface serialization primarily because of how XSD works XSD has the concept of base types and derived types, but it doesn t have a concept of interfaces So there s no direct equivalent to an interface in XSD Although an interface can be thought of as an abstract base class, trying to make interfaces to XSD abstract base types would not work because XSD supports only single inheritance whereas a VB NET class could implement multiple interfaces This results in the following limitation: A serializer must know the real object s type to serialize it, it cannot serialize a property of field that returns an interface For example, you might try to define an IDessert interface instead of the Dessert abstract class, and re-write the DessertMenu to use that interface like this:
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Public Class DessertMenu Public Item1 As IDessert Public Item2 As IDessert Public Item3 As IDessert 'Code omitted End Class
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The serializer would not be able to serialize DessertMenu objects, it would throw an exception because it does not know the real type of the objects contained in each of Item1, Item2, and Item3
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XML serialization and remoting The XML serialization classes you ve seen so far all live in the SystemXmlSerialization namespace There are other classes that live in SystemRemotingSerialization and are also responsible for serialization The two sets of classes satisfy different serialization needs: SystemXmlSerialization focuses on the needs of XML-based messaging Therefore, it provides an easy way to serialize and deserialize an object s public data thereby saving you the hassle of generating and parsing XML yourself But SystemXmlSerialization does not try to create faithful reproduction of the object through serialization then deserialization In fact, you ve seen an example where the seller serialized an object and the buyer used that XML to deserialize an object of a different type, it s all about the XML data On the other hand, SystemRemotingSerialization satisfies the need of serializing entire object graphs and deserializing them on the other end thereby creating a faithful reproduction of the object graph including the object identities With remoting, objects can be serialized to XML or a binary format SystemRemotingSerialization makes the most sense when a NET client and server (remote object) want to communicate, whereas SystemXmlSerialization is very useful for serializing public object state into XML for messaging
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The W3C s XSD Schema is the type system used for formally describing Web services messages Schemas offer many built-in types and let you define your own types as well as the structure of XML messages and documents You can also use XSD schemas with MSXML4 or with the XmlValidatingReader to validate incoming messages thereby enforcing the agreed-upon messaging contract In addition, if you are programming in NET, you can take advantage of the XML serialization framework to easily generate XML documents according to a pre-defined schema and/or to process incoming XML messages without having to write lots of parsing code You use XSD to describe all your messages
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