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LINQ to XML provides an altogether new way of processing XML data. This chapter examined many features of LINQ to XML in detail. You worked with classes such as XElement and XDocument that load XML trees for processing and learned how to deal with white spaces and namespaces in LINQ to XML. Common operations such as parsing, navigating, and modifying XML data were also covered. You also learned to validate XML documents against XSD schemas. Transforming XML data using LINQ to XML has its own advantages, and you used functional construction to transform the shape of the source XML. Finally, you projected an XML tree into a collection.

connection = (HttpURLConnection)link.openConnection();

Here you have a complex data type made up of two strings, each with a getter and a setter. You attribute the data class with the [DataContract] attribute, and each of its members with the [DataMember] attribute. You could of course have a larger class, with some data elements that you would want to keep private in this case, you simply do not attribute them as DataMembers. When you execute your application and browse to the Service.svc file, you ll see the service harness, as in Figure 7-4.

Now we get the page:

n 3, you learned about the XmlReader and XmlWriter classes. The abstract classes XmlReader and XmlWriter can be used in three ways: To call the Create() method of the respective classes that returns an instance of the generic XmlReader or XmlWriter classes To use the concrete classes XmlTextReader and XmlTextWriter provided by the .NET Framework To create custom classes that inherit from the XmlReader and XmlWriter classes You are already familiar with the first two approaches. In the following sections, you are going to learn how to create custom readers and writers from the abstract base classes XmlReader and XmlWriter.

As you can see in the screenshot, metadata publishing for the service is disabled. As a result, you cannot browse and understand the endpoints of the service using the harness without making a change to the Web.config file. The first change you ll need to make is in the behaviors section. Here is an example of a Web.config that has been modified for this Hello World service:

connection.setRequestMethod(GET); String contentType = connection.getContentType(); if( (contentType != null) && contentType.startsWith(TEXT_HTML) ) { InputStream input = (InputStream)connection.getContent();

In this section, you will create a custom implementation of the XmlReader class. The SqlCommand class provides the ExecuteXmlReader() method that returns an instance of XmlReader to the caller. This works fine if your database is SQL Server, but what if your database is Microsoft Office Access or any other OLEDB-compliant database Moreover, XML extensions such as the FOR XML clause may not be available for all databases. Does that mean that you cannot retrieve the data and read it by using an XmlReader Of course not. There is no out-of-the-box solution for this problem, but you can build your own mechanism to overcome this limitation, by creating a custom class that inherits from the XmlReader abstract class. You can then override the required properties and methods as per your need. The requirements for the custom XmlReader class are summarized here: It should accept the database connection string and table name to read. The column values should be treated as attribute values. It should allow iterating through the table to read each row. The column values should be accessible by specifying a column index or name.

<system.serviceModel> <services> <!-- Before deployment, you should remove the returnFaults behavior configuration to avoid disclosing information in exception messages --> <!--<service name="MyService" behaviorConfiguration="returnFaults"> <endpoint contract="IMyService" binding="wsHttpBinding"/> </service> --> <service name="MyService" behaviorConfiguration="MyServiceTypeBehaviors"> <endpoint contract="IMyService" binding="wsHttpBinding" /> </service> </services> <behaviors> <serviceBehaviors> <!--<behavior name="returnFaults" > <serviceDebug includeExceptionDetailInFaults="true" /> </behavior> --> <behavior name="MyServiceTypeBehaviors" > <serviceMetadata httpGetEnabled="true"></serviceMetadata> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel>

And read the page into a buffer:

BufferedReader reader = new BufferedReader(new InputStreamReader(input)); int i = 0; StringBuffer buffer = new StringBuffer(); String line = null; while((line = reader.readLine()) != null) { i++; buffer.append(line); }