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case RssElements.Rss: elementName = "rss"; break; case RssElements.Title: elementName = "title"; break; } writer.WriteElementString(elementName, value); } public override void WriteEndElement() { writer.WriteEndElement(); } The WriteStartElement() method accepts a parameter of type RssElements that indicates the element name to be written. It contains a switch statement that checks the supplied element name against various values from the RssElements enumeration. The name of the element is stored in a string variable. Finally, the WriteStartElement() method of XmlWriter is called by supplying the element name stored in the variable. The WriteElementString() method accepts two parameters: RssElements and the value of the element. It contains a similar switch statement as in the previous method and stores the element name in a variable. The WriteElementString() method of the XmlWriter class is called by passing the element name and its value. Note that WriteStartElement() and WriteElementString() are new methods that is, they are not defined by the XmlWriter base class. The WriteEndElement() method simply calls the WriteEndElement() method of the XmlWriter instance so that the end tag of the nearest element is emitted.

The init() method retrieves the path from which the crawler will start from the portlet configuration:

<Window x:Class="WPFIntro.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="WPFIntro" Height="300" Width="300"> <Grid> <Button FontFamily="Verdana"> <Button.Background> <SolidColorBrush Opacity="0.5"> <SolidColorBrush.Color>Blue</SolidColorBrush.Color> </SolidColorBrush> </Button.Background> Hello, Web.Next Readers! </Button> </Grid> </Window>

String path = (String)config.getInitParameter("crawlPath");

Just as we added methods for writing elements, we also need to add methods for emitting attributes. Three methods WriteStartAttribute(), WriteAttributeString(), and WriteEndAttribute() will do that job. Listing A-11 shows these methods. Listing A-11. Writing Attributes public void WriteStartAttribute(RssAttributes attb) { if (attb == RssAttributes.Version) { writer.WriteStartAttribute("version"); } }

Here, a SolidColorBrush type is used to define the button s background. This has properties of its own, such as its color and opacity. These are not properties of the button, but of the SolidColorBrush that is created to implement the background color of the button. So, you cannot use attributes of the button to define the properties of this brush. Instead, you define the <Button.Background> and define a <SolidColorBrush> underneath it. This also shows that you can mix your property declarations between using attributes (see the Opacity declaration) or dot syntax (see the Color declaration). When you use tools such as Expression Blend to define your UI, you ll have a Property Editor dialog, and this will generate this code for you. You can also define the properties of an element using markup extension syntax, where you refer to the properties of another element on the page. This can be used, for example, to set a common style on the page for a number of controls, and then have each control set itself according to the properties of that style. Markup extension uses curly braces ({}) to define the reference point. Here s an example:

It then creates a new crawler object, and invokes it on a background thread:

public void WriteAttributeString(RssAttributes attb, string value) { if (attb == RssAttributes.Version) { writer.WriteAttributeString("version",value); } } public override void WriteEndAttribute() { writer.WriteEndAttribute(); } The WriteStartAttribute() method accepts a parameter of type RssAttributes. Inside it checks whether the attribute to be emitted is Version, and if so, calls the WriteStartAttribute() method of the XmlWriter instance to write the attribute. The WriteAttributeString() method accepts two parameters: RssAttributes and the value of the attribute. It then calls the WriteAttributeString() method of the XmlWriter instance by passing the supplied value and version as the attribute name. The WriteEndAttribute() method simply calls the WriteEndAttribute() method of the XmlWriter instance.

crawler = new Crawler(path); Thread background = new Thread(crawler); background.start();

<Window x:Class="WPFIntro.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="WPFIntro" Height="300" Width="300"> <Window.Resources> <Style TargetType="Button" x:Key="ButtonStyle"> <Setter Property="Background" Value="Black"></Setter> </Style> </Window.Resources> <Grid> <Button FontFamily="Verdana" Style="{StaticResource ButtonStyle}"> Hello, Readers! </Button> </Grid> </Window>

Our code does not need to retain a reference to the thread object, since this will not be manipulated directly, but it does retain a reference to the crawler object, since it will need to access its methods in order to retrieve information and ultimately stop the crawler. When the portlet is eventually unloaded by the container, the destroy() method will be invoked:

Though the methods that we created for writing elements will take care of most of the RSS feed generation, you may need additional methods to emit comments, character data, white spaces, and so on. To accomplish this task, we will write a set of methods as shown in Listing A-12. Listing A-12. Methods for Writing Data public override void WriteCData(string text) { writer.WriteCData(text); } public override void WriteChars(char[] buffer, int index, int count) { writer.WriteChars(buffer, index, count); } public override void WriteComment(string text) { writer.WriteComment(text); }