book

.NET & XML

by Niel M. Bornstein

November 2003

Intermediate to advanced

476 pages

14h 38m

English

O'Reilly Media, Inc.

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2.2.3.1. XmlTextReader2.2.3.2. XmlValidatingReader2.2.3.3. XmlNodeReader
3.1.1.1. File access and permissions3.1.1.2. Encodings and StreamWriter
3.1.2.1. Writing data with Sockets3.1.2.2. Writing data with WebRequest
4.1.2.1. Writing the skeleton4.1.2.2. Defining the PYX traversal mechanism4.1.2.3. Storing the Node instance data4.1.2.4. Writing the tests4.1.2.5. Filling in the stubs
6.1.1.1. Parts of an XPath expression6.1.1.2. Selecting elements6.1.1.3. Selecting attributes6.1.1.4. Selecting text, comments, and processing instructions6.1.1.5. Selecting nodes by value
6.2.1.1. Selecting a single node6.2.1.2. Selecting multiple nodes6.2.1.3. Creating an XPathNavigator
6.2.3.1. Using a custom XmlReader6.2.3.2. Using a custom XPathNavigator
7.3.3.1. Creating a stylesheet7.3.3.2. Manipulating an existing stylesheet
7.3.4.1. Embedded scripts7.3.4.2. Adding parameters with XsltArgumentList7.3.4.3. Adding extensions with XsltArgumentList
9.1.1.1. The SOAP envelope9.1.1.2. Encoding rules9.1.1.3. RPC representation
10.2.3.1. Issuing an HTTP GET request10.2.3.2. Issuing an HTTP POST request10.2.3.3. Issuing a SOAP request
10.2.6.1. The UDDI data model10.2.6.2. The UDDI APIs
12.2.3.1. Member availability and flags12.2.3.2. Functional grouping of members
15.2.2.1. Choosing a configuration section handler15.2.2.2. Defining the configuration section15.2.2.3. Adding the configuration section15.2.2.4. Reading the custom configuration programmatically

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Network I/O

Network I/O is generally similar to file I/O, and both Stream and TextReader types are used to access to data from a network connection. The System.Net namespace contains additional classes that are useful in dealing with common network protocols such as HTTP, while the System.Net.Sockets namespace contains generalized classes for dealing with network sockets.

To create a connection to a web server, you will typically use the abstract WebRequest class and its Create( ) and GetResponse( ) methods. Create( ) is a static factory method that returns a new instance of a subclass of WebRequest to handle the URL passed in to Create( ). GetResponse( ) returns a WebResponse object, which provides a method called GetResponseStream( ). The GetResponseStream( ) method returns a Stream object, which you can wrap in a TextReader. As you’ve already seen, you can use a TextReader to read from an I/O stream.

The following code snippet shows a typical sequence for creating a connection to a network data source and displaying its contents to the console device. StreamReader is a concrete implementation of the abstract TextReader base class:

WebRequest request = WebRequest.Create("http://www.oreilly.com/");
WebResponse response = request.GetResponse( );
Stream stream = response.GetResponseStream( );
StreamReader reader = new StreamReader(stream);

// Read a line at a time and write it to the console
while (reader.Peek( ) != -1) {
  Console.WriteLine(reader.ReadLine( ));
}