Using xmlvalidatingreader c

For example, the reported node type may be different than the actual node type of the current node. Read State property to check whether a reader is in error state. For more information, see Validating XML Data with Xml Reader. Sets the Xml Resolver used for resolving external document type definition (DTD) and schema location references.

Create() method using appropriate Xml Reader Settings instead.")]public class Xml Validating Reader : Xml Reader, IHas Xml Parser Context, IXml Line Info, IXml Namespace Resolver Xml Validating Reader implements the Xml Reader class and provides support for data validation. Schemas property to have the reader validate by using schema files that are cached in an Xml Schema Collection. Validation Type property specifies what type of validation the reader should perform. After an exception is thrown the state of the reader is not predictable.

A valid document is one which, in addition to being well-formed, adheres to the rules laid out in a document type definition (DTD) or XML Schema.

By imposing some structure on an XML document, a DTD makes it possible for documents to conform to some standard rules, and for applications to avoid nasty surprises in the form of incompatible or invalid data.

Now, what does this have to do with the Xml Text Reader class I discussed in so much detail in the last segment of this previous tutorial? You see, while the class does throw up errors if your XML document isn’t well-formed, it does not support validation against a DTD, XDR or XSD Schema.

If you need to validate your XML file before processing it, you need to know its close cousin, the Xml Validating Reader object, which is derived from the same abstract XMLReader parent class.

Xml Validating Reader throws an Xml Exception on XML parse errors.

Note: The Xml Validating Reader class is obsolete in dnprdnext. The Xml Resolver is also used to handle any import or include elements found in XML Schema definition language (XSD) schemas.Now you may, as I did initially, question the rationale behind having a reader for such a specific requirement — after all, you can easily use the method and properties of the Xml Document object to parse the file.But it’s important to remember that DOM parsing is a processor-intensive task; therefore, using an Xml Reader object (which is faster and not as resource-hungry as the regular DOM parser) can produce better results in some cases.If you wish to catch up, check out the first article in this series.Onward Ho You already know that an XML document may be either “well-formed” or “valid.”A well-formed document is one which meets the specifications laid down in the XML recommendation; that is, it follows the rules for element and attribute names, contains all essential declarations, and has properly-nested elements.Second, it is not wise to assume that your application will always receive XML data in the form of a flat file or an XML data stream.

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