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xml"); XmlTextReader reader = new XmlTextReader(xmlFile); StringBuilder str = new StringBuilder(); readerReadStartElement("DvdList"); // Read all the <DVD> elements while (readerRead()) { if ((readerName == "DVD") && (readerNodeType == XmlNodeTypeElement)) { readerReadStartElement("DVD"); strAppend("<ul><b>"); strAppend(readerReadElementString("Title")); strAppend("</b><li>"); strAppend(readerReadElementString("Director")); strAppend("</li><li>"); strAppend(StringFormat("{0:C}", DecimalParse(readerReadElementString("Price")))); strAppend("</li></ul>"); } } // Close the reader and show the text readerClose(); lblXmlText = strToString(); Figure 12-6 shows the result..

Delete() Exists() GetAttributes() and SetAttributes() GetCreationTime(), GetLastAccessTime(), and GetLastWriteTime() Move()

You can also fine-tune the format in much more painstaking detail using the FOR XML EXPLICIT syntax. For example, this allows you to convert some fields to attributes and others to elements. Refer to the SQL Server Books Online for more information. Unfortunately, the FOR XML query syntax is specific to SQL Server and isn t supported by other database products.

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So far you ve seen a number of strategies for reading and parsing XML data. If you try to read invalid XML content using any of these approaches, you ll receive an error. In other words, all these classes require well-formed XML. However, none of the examples you ve seen so far has validated the XML to check that it follows any application-specific rules. As described at the beginning of this chapter, XML formats are commonly codified with an XML schema that lays out the required structure and data types. For the DVD list document, you can create an XML schema that looks like this: < xml version="1.0" > <xs:schema id="DvdList" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata"> <xs:element name="DvdList"> <xs:complexType> <xs:sequence maxOccurs="unbounded"> <xs:element name="DVD" type="DVDType" /> </xs:sequence> </xs:complexType> </xs:element>

Create() and CreateText()

To perform an XML query, you must use the SqlCommand.ExecuteXmlReader() method. This method returns an XmlReader with the results of your query as an XML fragment. You can move through the XmlReader one node at a time in a forward-only direction in the same way you use the XmlTextReader. In fact, XmlTextReader derives from XmlReader. Here s the code needed to retrieve and display a customer list on a web page: // Define the command. string customerQuery = "SELECT FirstName, LastName FROM Employees FOR XML AUTO, ELEMENTS"; SqlConnection con = new SqlConnection(connectionString); SqlCommand com = new SqlCommand(customerQuery, con); // Execute the command. StringBuilder str = new StringBuilder(); try { con.Open(); XmlReader reader = com.ExecuteXmlReader();

<xs:complexType name="DVDType"> <xs:sequence> <xs:element name="Title" type="xs:string" /> <xs:element name="Director" type="xs:string" /> <xs:element name="Price" type="xs:decimal" /> <xs:element name="Starring" type="StarringType" /> </xs:sequence> <xs:attribute name="ID" type="xs:integer" /> <xs:attribute name="Category" type="xs:string" /> </xs:complexType> <xs:complexType name="StarringType"> <xs:sequence maxOccurs="unbounded"> <xs:element name="Star" type="xs:string"/> </xs:sequence> </xs:complexType> </xs:schema> This schema defines two complex types, representing the list of stars (named StarringType) and the list of DVDs (named DVDType). The structure of the document is defined using an <element> tag. To validate an XML document against a schema, you use the XmlReader.Create() method, and pass in an XmlReaderSettings object that specifies the XSD schema you want to use. This tells .NET to create a validating reader, which works like the XmlTextReader but includes the ability to verify that the document follows schema rules. The validating reader throws an exception (or raises an event) to indicate errors as you move through the XML file. The first step when performing validation is to import the System.Xml.Schema namespace, which contains types such as XmlSchema and XmlSchemaCollection: using System.Xml.Schema; The following example shows how you can create a validating reader that uses the DvdList.xsd file and shows how you can use it to verify that the XML in DvdList.xml is valid: string xmlFile = Server.MapPath("DvdList.xml"); string xsdFile = Server.MapPath("DvdList.xsd"); // Set the validation settings. XmlReaderSettings settings = new XmlReaderSettings(); settings.Schemas.Add("", xsdFile); settings.ValidationType = ValidationType.Schema; // Open the XML file. FileStream fs = new FileStream(xmlFile, FileMode.Open); // Create the validating reader. XmlReader vr = XmlReader.Create(fs, settings); // Read through the document. while (vr.Read()) { // Process document here. // If an error is found, an exception will be thrown. } vr.Close();

Open(), OpenRead(), OpenRead(), and OpenText() ReadAllText(), ReadAllLines(), and ReadAllBytes()

while (reader.Read()) { // Process each employee. if ((reader.Name == "Employees") && (reader.NodeType == XmlNodeType.Element)) { reader.ReadStartElement("Employees"); str.Append(reader.ReadElementString("FirstName")); str.Append(" "); str.Append(reader.ReadElementString("LastName")); str.Append("<br />"); reader.ReadEndElement(); } } reader.Close(); } finally { con.Close(); } XmlText.Text = str.ToString(); Of course, life gets much more interesting when you combine an XML query with some of the other standards you ve seen in this chapter, such as XPath searching or XSL transformation. These techniques aren t for everyone, but they do give you the ability to transform your data into virtually any XML representation.

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