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CHAPTER 29 LINQ TO XML
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// create a data source containing Fruit objects List<Fruit> myFruitList = new List<Fruit>() { new Fruit("Cherry", "Red", 500), new Fruit("Apple", "Green", 230), new Fruit("Plum", "Red", 300), new Fruit("Banana", "Yellow", 100), new Fruit("Grape", "Green", 400) }; // perform a query to generate XElements IEnumerable<XElement> elements = from e in myFruitList where e.Color == "Red" select new XElement("Fruit", new XElement("Name", e.Name), new XElement("Details", new XElement("Color", e.Color), new XElement("StockLevel", e.ItemsInStock) ) ); // create a root node to contain the query results XElement rootNode = new XElement("Fruits", elements); // print out the XML data Console.WriteLine(rootNode); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } In this example, I have created some additional structure and used the Fruit properties values to create nested XElement objects. Here is the XML that compiling and running Listing 29-17 produces: <Fruits> <Fruit> <Name>Cherry</Name> <Details> <Color>Red</Color> <StockLevel>500</StockLevel> </Details> </Fruit> <Fruit> <Name>Plum</Name> <Details> <Color>Red</Color> <StockLevel>300</StockLevel> </Details> </Fruit>
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CHAPTER 29 LINQ TO XML
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</Fruits> Press enter to finish Making changes to the XElement that is projected by the select clause in the query allows us to create whatever XML we need. If you look at the results from Listing 29-17, you ll notice that there are only two fruits listed in the XML. This is because I added a where clause to the query in Listing 29-17 to filter out any Fruit whose Color property isn t Red. Not only can you readily create XML from objects, but you can also use all the LINQ features for filtering, grouping, and sorting features that we learned about in 27.
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Create Objects from XML
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As the complement to creating XML from objects, you can also use a LINQ query to create objects from XML, as shown by Listing 29-18. Listing 29-18. Querying XML to Create Objects using using using using System; System.Collections.Generic; System.Linq; System.Xml.Linq;
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class Fruit { public Fruit(string nameParam, string colorParam, int stockParam) { Name = nameParam; Color = colorParam; ItemsInStock = stockParam; } public string Name { get; set; } public string Color { get; set; } public int ItemsInStock { get; set; } } class Listing 18 { static void Main(string[] args) { // load the XML to create an XElement XElement rootNode = XElement.Load(@"..\..\data.xml"); // query the XML IEnumerable<Fruit> results = from e in rootNode.Elements() select new Fruit( e.Element("Name").Value, e.Element("Color").Value, int.Parse(e.Element("StockLevel").Value)
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CHAPTER 29 LINQ TO XML
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); // enumerate the results foreach (Fruit f in results) { Console.WriteLine("Name: {0}, Color: {1}, Stock: {2}", f.Name, f.Color, f.ItemsInStock); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The data source for the query in Listing 29-18 is the IEnumerable<XElement> obtained by calling the Elements method on the root node. I then use the Element method that allows me to search for XElements by name to get the values I need to call the constructor of the Fruit class. I project new Fruit objects for each Fruit node in the XML data. Compiling and running Listing 29-15 produces the following results: Name: Name: Name: Name: Name: Press Cherry, Color: Red, Stock: 500 Apple, Color: Green, Stock: 230 Plum, Color: Red, Stock: 300 Banana, Color: Yellow, Stock: 100 Grape, Color: Green, Stock: 400 enter to finish
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Modifying and Transforming XML Data
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The classes in the System.Xml.Linq namespace make it easy to use LINQ queries to modify or transform XML data. There is any number of different ways to do this, but I ll show you some common examples to provide a starting place.
Adding Elements to XML
A common problem is adding information to XML data. One of the most powerful ways to do this is using a LINQ join operation, as demonstrated by Listing 29-19. Listing 29-19. Using a Join to Add Attributes to XML using using using using System; System.Collections.Generic; System.Linq; System.Xml.Linq;
class WeightInformation { public WeightInformation(string nameParam, float weightParam) {
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