.NET & XML

Using XmlPyxReader

Luckily, you already have just such an application. In Chapter 2, I showed you how to write PoToPickList, which generates the PO pick list from an XML file. You can now plug XmlPyxReader in to PoToPickList to generate a pick list from a PYX document. Example 4-4 shows the Main( ) method of PoToPickList again, with the change highlighted.

Example 4-4. Main( ) method of PoToPickList, using XmlPyxReader

public static void Main(string[ ] args) {

  string filename = args[0];

  TextReader textReader = File.OpenText(filename);
  XmlReader reader = new XmlPyxReader(textReader);

  StringBuilder pickList = new StringBuilder( );
  pickList.Append("Angus Hardware PickList").Append(Environment.NewLine);
  pickList.Append("=======================").Append(Environment.NewLine).Append(
Environment.NewLine);

  while (reader.Read( )) {
    if (reader.NodeType == XmlNodeType.Element) {
      switch (reader.LocalName) {
        case "po":
          pickList.Append(POElementToString(reader));
          break;
        case "date":
          pickList.Append(DateElementToString(reader));
          break;
        case "address":
          reader.MoveToAttribute("type");
          if (reader.Value == "shipping") {
            pickList.Append(AddressElementToString(reader));
          } else {
            reader.Skip( );
          }
          break;
        case "items":
          pickList.Append(ItemsElementToString(reader));
          break;
      }
    }
  }

  Console.WriteLine(pickList);
}

If you run the PYX purchase order in Example 4-1 through PoToPicklist again, you’ll see exactly the same results you saw in Chapter 2, reproduced here in Example 4-5.

Example 4-5. Output of PoToPickList, ...