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In addition to the partial list of operators shown in Table 13-3, the System.Linq.Enumerable class provides a set of methods that do not have a direct C# query operator shorthand notation, but are instead exposed as extension methods. These generic methods can be called to transform a result set in various manners (Reverse<>(), ToArray<>(), ToList<>(), etc.). Some are used to extract singletons from a result set, others perform various set operations (Distinct<>(), Union<>(), Intersect<>(), etc.), and still others aggregate results (Count<>(), Sum<>(), Min<>(), Max<>(), etc.). To begin digging into more intricate LINQ queries, create a new Console Application named FunWithLinqExpressions. Next, you need to define an array or collection of some sample data. For this project, you will make an array of ProductInfo objects, defined in the following code: class ProductInfo { public string Name {get; set;} public string Description {get; set;} public int NumberInStock {get; set;} public override string ToString() { return string.Format("Name={0}, Description={1}, Number in Stock={2}", Name, Description, NumberInStock); } } Now populate an array with the a batch of ProductInfo objects within your Main() method: static void Main(string[] args) { Console.WriteLine("***** Fun with Query Expressions *****\n"); // This array will be the basis of our testing...

ProductInfo[] itemsInStock = new[] { new ProductInfo{ Name = "Mac's Coffee", Description = "Coffee with TEETH", NumberInStock = 24}, new ProductInfo{ Name = "Milk Maid Milk", Description = "Milk cow's love", NumberInStock = 100}, new ProductInfo{ Name = "Pure Silk Tofu", Description = "Bland as Possible", NumberInStock = 120}, new ProductInfo{ Name = "Cruchy Pops", Description = "Cheezy, peppery goodness", NumberInStock = 2}, new ProductInfo{ Name = "RipOff Water", Description = "From the tap to your wallet", NumberInStock = 100}, new ProductInfo{ Name = "Classic Valpo Pizza", Description = "Everyone loves pizza!", NumberInStock = 73} }; // We will call various methods here! Console.ReadLine(); }

s function creates a new node using default values. You can override those settings or append new data to the settings through the $settings parameter. An example of $settings could be: $settings = array( type => event , event_date => 2012-12-21 00:00:00 , ); where the content type is set to event instead of the default content type for your site, and a new field named event_date is created and assigned a value. The default values associated with creating a node are:

Because the syntactical correctness of a LINQ query expression is validated at compile time, you need to remember that the ordering of these operators is critical. In the simplest terms, every LINQ query expression is built using the from, in, and select operators. Here is the general template to follow: var result = from matchingItem in container select matchingItem; The item after the from operator represents an item that matches the LINQ query criteria, which can be named anything you choose. The item after the in operator, represents the data container to search (an array, collection, or XML document). Here is a very simple query, doing nothing more than selecting every item in the container (similar in behavior to a database Select * SQL statement). Consider the following: static void SelectEverything(ProductInfo[] products) { // Get everything! Console.WriteLine("All product details:"); var allProducts = from p in products select p; foreach (var prod in allProducts) { Console.WriteLine(prod.ToString()); } }

To be honest, this query expression is not entirely useful, given that your subset is identical to that of the data in the incoming parameter. If you wish, you could use this incoming parameter to extract only the Name values of each car using the following selection syntax: static void ListProductNames(ProductInfo[] products) { // Now get only the names of the products. Console.WriteLine("Only product names:"); var names = from p in products select p.Name; foreach (var n in names) { Console.WriteLine("Name: {0}", n); } }