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From an XML perspective, LINQ to XML provides the query and transformation power of XQuery and XPath integrated into .

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

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.

It takes advantage of standard query operators and adds query extensions specific to XML.

From one perspective you can think of LINQ to XML as a member of the LINQ Project family of technologies with LINQ to XML providing an XML Language-Integrated Query capability along with a consistent query experience for objects, relational database (LINQ to SQL, LINQ to Data Set, LINQ to Entities), and other data access technologies as they become LINQ-enabled.

From another perspective you can think of LINQ to XML as a full feature in-memory XML programming API comparable to a modernized, redesigned Document Object Model (DOM) XML Programming API plus a few key features from XPath and XSLT.

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.

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