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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Generating a DataSet

I said the generated schema is a normal XML Schema document, and it is. It does, however, contain a few extra attributes with the msdata prefix. These attributes help the XSD tool to generate a subclass of DataSet with convenience methods to access tables and columns in a more type-safe manner. After running the CreateDataSet program, execute this command:

xsd /dataset Coupons.xsd

Tip

This is the same XSD tool that I introduced in Chapter 8.

The resulting file, Coupons.cs, contains the class AngusHardware, which extends DataSet, as well as a number of support classes. It’s a much more complex structure than the one we generated in Chapter 8 and Chapter 9, and with good reason; it is used to create a DataSet, not just to load XML data with XmlSerializer.

You can see the benefit of the generated DataSet if you compare the code in Example 11-5 with that in Example 11-7.

Example 11-7. Populating a DataSet generated by xsd

using System;

public class CreateData {
  public static void Main(string [ ] args) {

    AngusHardware dataSet = new AngusHardware( );

    dataSet.coupons.AddcouponsRow(
      "763FF", 0.5, (int)DiscountType.Fixed, new DateTime(2002,12,31));

    dataSet.WriteXml("Coupons.xml");
  }
}

The generated DataSet class contains members named after the tables and columns in the schema. To start with, the name of the main class, AngusHardware, reflects the name of the DataSet. Each DataTable of the DataSet is represented by a generated private class within the DataSet; the “coupons” ...