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CHAPTER 6 SOA IN .NET: WEB SERVICES
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Figure 6-18. The BookDetails type as viewed in the Object Browser The property named BookImage is an instance of type Bitmap, which holds an image of the book cover. The Bitmap type is not serializable, and has no default constructor. This means the following simple Web Service is invalid: [WebMethod] public BookDetails getABook(int BookID) { return new BookDetails(BookID); } An attempt to invoke this operation results in the following error displayed in Figure 6-19. You could work around this problem by making the following code change to the definition of the BookDetails type: [XmlIgnore()] public Bitmap BookImage { get { return m_BookImage; } set { m_BookImage= value; } } This causes the default serializer to ignore this property. Now you can use the type as a return value and invoke the Web Method that was failing above. The BookDetails type now produces the following XML on the wire (see Figure 6-20).
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CHAPTER 6 SOA IN .NET: WEB SERVICES
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Figure 6-19. BookDetails cannot be returned by a Web Service because it contains a bitmap
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Figure 6-20. BookDetails with the bitmap excluded by applying the XmlIgnore attribute
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CHAPTER 6 SOA IN .NET: WEB SERVICES
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This works, but only at the expense of excluding your image! What if you need that image There s nothing preventing you from encoding the binary information into the result message; it s just not supported out of the can by the tools. You ll have to take matters into your own hands. To take full control of the XML and schema used to represent your own types on the wire, you need to add the XmlSchemaProvider attribute to your class declaration and implement the two methods required of you by the IXmlSerializable interface. You ll create a type that uses this custom SOAP serialization pattern to put a collection of BookDetails on the wire. You re also going to need to control how the client takes instances of the type off the wire. To do this you ll create another XmlSchemaImporter and register it in the machine configuration file on the client. Your steps for this solution will be to 1. Create a type that builds a collection of BookDetails objects. 2. Have this type implement the IXmlSerializable interface. 3. Invent your own schema describing BookDetails on the wire. 4. Add a static method that emits this XmlSchema for the type on the wire. 5. Generate markup consistent with this schema in the WriteXml method of IXmlSerializable. 6. Create instances of the BookDetails types based on this markup in the ReadXml method. 7. Create a SchemaImporterExtension that maps the collection type on the wire back to your implementation of IXmlSerializable. 8. Register this type in the machine configuration file on the client. 9. Generate a proxy and code against it. Let s start by looking at the code to implement IXmlSerializable. First, we ll take a peek at the code that provides its base functionality. (This code can be found in BookCollection.cs of the Library project.) public class BookCollection : IEnumerable, IXmlSerializable { public Hashtable ht = new Hashtable(); private static string ns = "http://www.intertechtraining.com/Library/BookCollection"; public int Add(BookDetails book) { ht.Add(book.BookID, book); return ht.Count - 1; } public int Count { get { return ht.Count; }
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CHAPTER 6 SOA IN .NET: WEB SERVICES
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} public void Remove(int BookID) { ht.Remove(BookID); } public void Remove(BookDetails book) { ht.Remove(book.BookID); } public IEnumerator GetEnumerator() { return ht.GetEnumerator(); } ... As you can see, this type just provides a simple wrapper around a Hashtable, accepting only instances of the BookDetails type, and keying the entries with the book IDs. To implement IXmlSerializable, you must provide code for three methods. The first of these is GetSchema, but GetSchema has been deprecated, and so you need only to simply return a null: public System.Xml.Schema.XmlSchema GetSchema() { return null; } This method stays on the interface for backwards compatibility. The actual schema that describes your type as it will appear on the wire is provided via another method, one of your choosing. This needs to be a static method on your type that accepts a single argument of type XmlSchemaSet and returns an XmlQualifiedName. You can choose any name for this static method. You tell the serializer the name you ve chosen using an attribute on your type. You ll modify the class to name this method with the XmlSchemaProvider attribute, and then add this static method to the type. Given the name of the method, it gets invoked using Reflection. Here we do this with a method we ve chosen to name BookCollectionXsd: [XmlSchemaProvider("BookCollectionXsd")] public class BookCollection : IEnumerable, IXmlSerializable { public static XmlQualifiedName BookCollectionXsd(XmlSchemaSet xss) { string xsdPath = HttpContext.Current.Server.MapPath("BookCollection.xsd"); XmlSchema xs = XmlSchema.Read(new XmlTextReader(xsdPath), null); xss.XmlResolver = new XmlUrlResolver(); xss.Add(xs); return new XmlQualifiedName("BookCollection_Type", ns); } ...
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