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11. XML Processing
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Validation Events
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If the ValidationType is set to Auto, DTD, Schema, or XDR and validation errors occur when parsing an XML document, an XmlSchemaException is thrown and parsing of the current node stops. Parsing cannot be resumed once an error has occurred. Alternatively, the ValidationEventHandler member of XmlValidatingReader allows the programmer to specify a delegate that is called to handle validation errors, suppressing the exception that would be raised. The arguments of the delegate provide access to information about the severity of the validation error, the exception that would have occurred, and a textual message associated with the error. Use of the ValidationEventHandler member allows the programmer to determine whether to resume or terminate the parser.
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Cached Schemas
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The read-only XmlValidatingReader.Schemas property can be used in conjunction with the XmlSchemaCollection class to cache XSD and XDR schemas in memory, saving the reader from having to reload schema files. However, XmlValidatingReader doesn't automatically cache schemas; any caching must be explicitly performed by the programmer. Once cached, schemas cannot be removed from an XmlSchemaCollection. The XmlValidatingReader maintains an XmlSchemaCollection that is accessed via the Schemas property; the most common way to add new schema files to the collection is by using the Add method. The XmlSchemaCollection class implements the ICollection and IEnumerable interfaces and provides indexer access to schemas based on a namespace URI. An important feature of the XmlSchemaCollection is the ValidationEventHandler event; this member is unrelated to the ValidationEventHandler member of the XmlValidatingReader class. This event specifies a method called to handle errors that occur when validating a schema loaded into the collection. XmlSchemaCollection throws an XmlSchemaException if no event handler is specified. The following example demonstrates the steps necessary XmlSchemaCollection validation event handler and to cache a schema.
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using System; using System.Xml; using System.Xml.Schema; public class schematest { public static void Main() { // Create the validating reader XmlTextReader rdr = new XmlTextReader("MyXmlDocument.xml"); XmlValidatingReader valRdr = new XmlValidatingReader(rdr); // Get the schema collection from the validating reader XmlSchemaCollection sCol = valRdr.Schemas;
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configure
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11. XML Processing // Set the validation event handler for the schema collection sCol.ValidationEventHandler += new ValidationEventHandler(ValidationCallBack); // Cache a schema in the schema collection sCol.Add("urn:mynamespace","myschema.xsd"); } // Create handler for validation events public static void ValidationCallBack(object sender, ValidationEventArgs args) { Console.WriteLine("Schema error : " + args.Exception.Message); } }
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Differences from XmlTextReader
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As mentioned at the start of this section, XmlValidatingReader has a number of new members or members with behavior different from that of the members in XmlTextReader; these members are summarized in Table 11-13.
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Table 11-13. Differences Between XmlValidatingReader and XmlTextReader
Member Comments Different CanResolveEntity Always returns true. Returns true if the current node is an attribute whose value was generated IsDefault from a default specified in a DTD or a schema. While XmlValidatingReader implements the IXmlLineInfo interface, LineNumber explicit interface implementation has been used to implement the LineNumber property. The XmlValidatingReader must be explicitly cast to an IXmlLineInfo type before LineNumber can be called. Same as LineNumber. LinePosition ResolveEntity() This method resolves the entity reference if the current node is an EntityReference. New Returns the XmlReader used to instantiate the XmlValidatingReader. Reader
XmlNodeReader
The System.Xml.XmlNodeReader class is a concrete implementation of XmlReader that provides read-only, forward-only cursor style access to a Document Object Model (DOM) node or subtree. The XmlNodeReader provides predominantly the same behavior and functionality as the XmlTextReader described in the "XmlTextReader" section earlier in this chapter. However, XmlNodeReader offers a single constructor with the following signature:
public XmlNodeReader(XmlNode node);
11. XML Processing
The node argument provides the root element of the XmlNodeReader. Given that XmlDocument derives from XmlNode, the XmlNodeReader can be used to navigate a partial or full DOM tree. The following code fragment demonstrates the creation of an XmlNodeReader using an XmlDocument as the source. We then iterate through the nodes and display the names of any Element type nodes on the console.
XmlDocument doc = new XmlDocument(); doc.Load("SomeXmlFile.xml"); XmlNodeReader rdr = new XmlNodeReader(doc); while (rdr.Read()) { if (rdr.NodeType == XmlNodeType.Element) { System.Console.WriteLine("Node name = {0}", rdr.LocalName); } }
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