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CHAPTER 9 I DATA ACCESS
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Apples Oranges Bananas
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I Note The File.OpenText method assumes your file has a UTF-8 encoding. If your file does not use this
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text encoding, you should call the OpenRead method and then wrap the resulting FileStream object in a StreamReader, passing in the appropriated encoding object. For example, if your file used the encoding Windows-1252 for Western languages, you should open it via new StreamReader(File.OpenRead ("accents.txt"), Encoding.GetEncoding(1252)).
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The System.Xml Namespace
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XML has become a popular data format for a number of reasons, probably because for most people it is a convenient format to represent their data and because the resulting files tend to be reasonably human readable. Programmers tend to like that you can have both files be unstructured (that is, don t follow a set pattern) or have the files be structured and have the data conform to a contract defined by an XSD schema. Programmers also like the convenience of being able to query the data using XPath, which means that writing custom parsers for new data formats is rarely necessary, and files can quickly be converted between different XML formats using the powerful XSLT language to transform data. The System.Xml namespace contains classes for working with XML files using all the different technologies I have described and more besides this. You ll look at the most common way to work with XML files the .NET implementation of the W3C recommendation for the XML Document Object Model (DOM), which is generally represented by the class XmlDocument. The first example in this section will read information from the following short XML file, fruits.xml: <fruits> <apples>2</apples> < oranges >3</oranges> <bananas>1</bananas> </fruits> The following code loads fruits.xml, binds it to the identifier fruitsDoc, and then uses a loop to display the data: #light open System.Xml let fruitsDoc = let temp = new XmlDocument() temp.Load("fruits.xml") temp
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CHAPTER 9 I DATA ACCESS
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let fruits = fruitsDoc.SelectNodes("/fruits/*") for x in fruits do printfn "%s = %s " x.Name x.InnerText The results are as follows: apples = 2 oranges = 3 bananas = 1 The next example looks at how to build up an XML document and then write it to disk. Say you have a set of data, bound to the identifier animals, and you d like to write it as XML to the file animals.xml. You start by creating a new XmlDocument object, and then you build the document by creating the root node via a call to the XmlDocument instance member CreateElement method and then append to the document object using its AppendChild method. The rest of the document is built up by enumerating over the animals list and creating and appending nodes. #light open System.Xml let animals = [ "ants", "6"; "spiders", "8"; "cats", "4" ] let animalsDoc = let temp = new XmlDocument() let root = temp.CreateElement("animals") temp.AppendChild(root) |> ignore animals |> List.iter (fun x -> let element = temp.CreateElement(fst x) element.InnerText <- (snd x) root.AppendChild(element) |> ignore ) temp animalsDoc.Save("animals.xml") The result of this code is a file, animals.xml, containing the following XML document: <animals> <ants>6</ants> <spiders>8</spiders> <cats>4</cats> </animals> The System.Xml namespace is large, with many interesting classes to help you work with XML data. Table 9-1 describes some of the most useful ones.
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CHAPTER 9 I DATA ACCESS
Table 9-1. Summary of Useful Classes from the System.XML Namespace
Class
System.Xml.XmlDocument System.Xml.XmlNode
Description
The Microsoft .NET implementation of the W3C s XML DOM. This class can t be created directly but is often used; it is the result of the XmlDocument s SelectSingle node method. This class is a collection of nodes and is the result of the XmlDocument s SelectNode method. This provides forward-only, read-only access to an XML document. Although not as easy to use as the XmlDocument class, it does not require the whole document to be loaded into memory. When working with big documents, it can often provide better performance than the XmlDocument. This class provides a forward-only way to write to an XML document. If you must start your XML document from scratch, this is often the easiest way to create it. This provides a way of loading an XML schema into memory and then allows the user to validate XML documents with it. This allows a user to serialize .NET objects directly to and from XML. However, unlike the BinarySerializer available elsewhere in the framework, this class serializes only public fields. This class is designed to be the most efficient way to work with XPath expressions. This class is just the wrapper for the XML document; the programmer must use the XPathExpression and XPathNavigator to actually do the work. This class represents an XPath expression to be used with an XPathDocument; it can be compiled to make it more efficient when used repeatedly. Once an XPathExpression has been executed against the XPathDocument, this class can be used to navigate the results; the advantage of this class is that it pulls only one node at a time into memory, making it efficient in terms of memory. This class can be used to transform XML using XSLT style sheets.
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