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05-May-2019 19:07

Even without Language-Integrated Query capabilities LINQ to XML represents a significant stride forward for XML programming. Here is how you would construct the same XML tree by using LINQ to XML functional construction.

The next section of this document, "Programming XML", provides more detail on the in-memory XML Programming API aspect of LINQ to XML. XElement contacts = new XElement("contacts", new XElement("contact", new XElement("name", "Patrick Hines"), new XElement("phone", "206-555-0144", new XAttribute("type", "home")), new XElement("phone", "425-555-0145", new XAttribute("type", "work")), new XElement("address", new XElement("street1", "123 Main St"), new XElement("city", "Mercer Island"), new XElement("state", "WA"), new XElement("postal", "68042") ) ) ); Notice that by indenting (and squinting a bit) the code to construct the XML tree shows the structure of the underlying XML.

Yet, from a development perspective, XML is still hard to work with.

If you ask the average software developer to work in XML you will likely hear a heavy sigh.

In LINQ to XML, an XName represents a full XML name consisting of an XNamespace object and the local name. In contrast, the W3C DOM always treats text as an XML node.

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NET Framework languages that implement the LINQ pattern (for example, C#, Visual Basic, and so on.).

The samples in most of this document are shown in C# for brevity.

(44 printed pages) Introduction Sample XML Programming XML With LINQ to XML LINQ to XML Design Principles The LINQ to XML Class Hierarchy XML Names Loading Existing XML Creating XML From Scratch Traversing XML Manipulating XML Working With Attributes Working With Other Types of XML Nodes Annotating Nodes With User-Defined Information Outputting XML Validating XML Querying XML With LINQ to XML Querying XML Using Query Expressions with XML Using XPath and XSLT With LINQ to XML Mixing XML and Other Data Models Reading From a Database to XML Reading XML and Updating a Database Layered Technologies Over LINQ to XML LINQ to XML in Visual Basic 9.0 Schema Aware XML Programming February 2007 CTP Release Notes Changes Since the May 2006 CTP Non-Exhaustive List of Planned Features in Future Releases References XML has achieved tremendous adoption as a basis for formatting data whether in Word files, on the wire, in configuration files, or in databases; XML seems to be everywhere.

For example using Xml Document (the DOM implementation from Microsoft) this would be a typical way to create an XML tree. Inner Text = "206-555-0144"; Xml Element phone2 = doc. XDocument contacts Doc = new XDocument( new XDeclaration("1.0", "utf-8", "yes"), new XComment("LINQ to XML Contacts XML Example"), new XProcessing Instruction("My App", "1"), new XElement("contacts", new XElement("contact", new XElement("name", "Patrick Hines"), new XElement("phone", "206-555-0144"), new XElement("address", new XElement("street1", "123 Main St"), new XElement("city", "Mercer Island"), new XElement("state", "WA"), new XElement("postal", "68042") ) ) ) ); XML names LINQ to XML goes out of its way to make XML names as straightforward as possible.

Xml Document doc = new Xml Document(); Xml Element name = doc. Inner Text = "Patrick Hines"; Xml Element phone1 = doc. Arguably, the complexity of XML names, which is often considered an advanced topic in XML literature, comes not from namespaces, which developers use regularly in programming, but from XML prefixes.

This is true from both a conceptual perspective, emphasizing a straightforward, easy to use programming model, and from a memory and performance perspective. This is an unnecessary layer of complexity that LINQ to XML avoids.