Applied XML programming for Microsoft.NET by Dino Esposito

By Dino Esposito

XML is buried all over the Microsoft .NET Framework, yet potent XML parsing and coding in .NET calls for adjustment. This ebook describes the set of XML center sessions in .NET, introduces the .NET XML parsing version and the way to software opposed to it, and discusses XML readers and writers and XMLDOM. It examines similar applied sciences equivalent to schemas, differences, and XPath, and it discusses facts matters comparable to synchronization and serialization, the DiffGram layout, and the XML extensions in Microsoft SQL Server 2000. This Microsoft Press name additionally unearths find out how to get the simplest functionality from XML with .NET, and it bargains in-depth info on interoperability subject matters corresponding to whilst to take advantage of XML internet prone and whilst to take advantage of remoting.

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In no case, though, does this reader validate against a schema or DTD. If you need more functionality (for example, validation), you must resort to other reader classes such as XmlNodeReader or XmlValidatingReader. An instance of the XmlTextReader class can be created in a number of ways and from a variety of sources, including disk files, URLs, streams, and text readers. To process an XML file, you start by instantiating the constructor, as shown here: XmlTextReader reader = new XmlTextReader(file); Note that all the public constructors available require you to indicate the source of the data, be it a stream, a file, or whatever else.

DefaultCredentials property. If the default credentials still don't provide access, the resolve attempt will fail. Default credentials represents the system credentials for the application security context—that is, the credentials of the logged-in user or the user being impersonated. Reading Large Streams The XmlTextReader class provides a few methods—ReadChars, ReadBinHex, and ReadBase64—tailored to read chunks of data out of a large stream of embedded text. These methods share almost the same prototype and overall logic, but differ in how they preprocess and return the fetched data: public int ReadChars (char[] array, int offset, int len); public int ReadBinHex(byte[] array, int offset, int len); public int ReadBase64(byte[] array, int offset, int len); All three methods can be used only to read the text associated with an Element node.

In both cases, overloads of the method and the property allow you to access attributes in various ways: by absolute position, by name, and by name and namespace. The returned value for an attribute is always a string; the task of converting it to a more specific data type is left to the programmer. GetAttribute and Item provide a way to access attributes directly but require that you know the name or the ordinal position of the attribute being accessed. A third way to read attribute values is by moving the pointer to the attribute node itself and then using the Value property.

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