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Now that you have created a custom implementation of XmlReader, let s move further and see how to create a custom XmlWriter. As an example, we will create an RSS writer that emits RSS feeds. Really Simple Syndication (RSS) is a standard way to share your website content with others. It is nothing but standardized XML markup that describes the content you want to share. Because RSS is a widely accepted format, your content immediately becomes ready to be consumed by others. Listing A-5 illustrates an RSS document. Listing A-5. Sample RSS Markup <rss version="2.0"> <channel> <title>DotNetBips.com Latest Articles</title> <link>www.dotnetbips.com</link> <description>DotNetBips.com Latest Articles</description> <copyright>Copyright (C) DotNetBips.com. All rights reserved.</copyright> <generator>www.dotnetbips.com RSS Generator</generator> <item> <title>Using WebRequest and WebResponse</title> <link>http://www.dotnetbips.com/displayarticle.aspx id=239</link> <description>Description here</description> <pubDate>Sun, 25 Jan 2004 12:00:00 AM GMT</pubDate> </item> </channel> </rss>
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APPEN DIX A CRE ATING CUS TOM XMLRE ADER A ND XMLWRITER C LAS SES
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Let s look at each markup tag closely: <rss> forms the root tag and has a version attribute. The latest version is 2.0. <channel> contains tags such as <title>, <link>, and <item> nodes. A channel represents metadata information from a particular source. It essentially acts as a container for the rest of the tags. An RSS document can contain one or more channels. <title> represents the title of this RSS feed. <link> represents the URL of the website providing the RSS feed. <description> details more information about this feed. <copyright> specifies copyright information. <generator> specifies the application that generated this feed. In addition to the preceding tags, there can be one or more <item> tags, each of which represents an actual item that you want to share (for example, an article or a blog entry). Each <item> tag further contains the following subnodes: <title> represents the title of this item (for example, the article title). <link> represents the URL of this item (for example, the article URL). <description> contains the description of the item (for example, a summary of the article). <pubDate> contains the publication date of the item. A typical date format is Sun 28 Dec 2003 12:00:00 AM GMT.
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Note The RSS markup shown here is the basic markup. You may need to add additional tags to incorporate additional information. You can obtain more information about RSS at http://en.wikipedia.org/ wiki/RSS_(file_format).
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In the absence of any out-of-the-box solution for generating RSS feeds in your website, you need to use classes such as XmlTextWriter yourself. You also need to remember the allowed tag names. To overcome this problem, we will create a custom class called RssWriter. The RssWriter class will inherit from XmlWriter and allow you to emit RSS feeds easily. To create RssWriter, you need to create a class library project. As before, be sure to add a reference to the System.Xml assembly.
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Inheriting from XmlWriter
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To create a custom implementation of XmlWriter, you need to inherit from it and override the properties and methods shown in Listing A-6.
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AP P END I X A CREA TI NG C UST O M X MLREA D ER AN D XM LWRI T ER C LA SS ES
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Listing A-6. Properties and Methods of the XmlWriter Class public abstract void Close(); public abstract void Flush(); public abstract string LookupPrefix(string ns); public abstract void WriteBase64(byte[] buffer, int index, int count); public abstract void WriteCData(string text); public abstract void WriteCharEntity(char ch); public abstract void WriteChars(char[] buffer, int index, int count); public abstract void WriteComment(string text); public abstract void WriteDocType(string name, string pubid, string sysid, string subset); public abstract void WriteEndAttribute(); public abstract void WriteEndDocument(); public abstract void WriteEndElement(); public abstract void WriteEntityRef(string name); public abstract void WriteFullEndElement(); public abstract void WriteProcessingInstruction(string name, string text); public abstract void WriteRaw(string data); public abstract void WriteRaw(char[] buffer, int index, int count); public abstract void WriteStartAttribute(string prefix, string localName, string ns); public abstract void WriteStartDocument(bool standalone); public abstract void WriteStartDocument(); public abstract void WriteStartElement(string prefix, string localName, string ns); public abstract WriteState WriteState { get; } public abstract void WriteString(string text); public abstract void WriteSurrogateCharEntity(char lowChar, char highChar); public abstract void WriteWhitespace(string ws); Many of these properties and methods should be familiar to you because we discussed them in 3.
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