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This example works as expected, only because the return value of the GetStringSubset() and the LINQ query within this method has been strongly typed. If you used the var keyword to define the subset variable, it would be permissible to return the value only if the method is still prototyped to return IEnumerable<string> (and if the implicitly typed local variable is in fact compatible with the specified return type). Because it is a tad bit inconvenient to operate on IEnumerable<T>, you could make use of immediate execution. For example, rather than returning IEnumerable<string>, you could simply return a string[], provided that you transform the sequence to a strongly typed array. Consider this new method of the Program class which does this very thing: static string[] GetStringSubsetAsArray() { string[] colors = {"Light Red", "Green", "Yellow", "Dark Red", "Red", "Purple"}; var theRedColors = from c in colors where c.Contains("Red") select c; // Map results into an array. return theRedColors.ToArray(); } With this, the caller can be blissfully unaware that their result came from a LINQ query, and simply work with the array of strings as expected. For an example, see the following code: foreach (string item in GetStringSubsetAsArray()) { Console.WriteLine(item); } Immediate execution is also critical when attempting to return to the caller the results of a LINQ projection. You ll examine this topic a bit later in the chapter. However, next up, let s look at how to apply LINQ queries to generic and nongeneric collection objects.

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Beyond pulling results from a simple array of data, LINQ query expressions can also manipulate data within members of the System.Collections.Generic namespace, such as the List<T> type. Create a new Console Application project named LinqOverCollections, and define a basic Car class that maintains a current speed, color, make, and pet name as shown in the following code: class Car { public string PetName {get; set;}

public string Color {get; set;} public int Speed {get; set;} public string Make {get; set;} } Now, within your Main() method define a local List<T> variable of type Car, and make use of object initialization syntax to fill the list with a handful of new Car objects: static void Main(string[] args) { Console.WriteLine("***** LINQ over Generic Collections *****\n"); // Make a List<> of Car objects. List<Car> myCars = new List<Car>() { new Car{ PetName = "Henry", Color = "Silver", Speed = 100, Make = "BMW"}, new Car{ PetName = "Daisy", Color = "Tan", Speed = 90, Make = "BMW"}, new Car{ PetName = "Mary", Color = "Black", Speed = 55, Make = "VW"}, new Car{ PetName = "Clunker", Color = "Rust", Speed = 5, Make = "Yugo"}, new Car{ PetName = "Melvin", Color = "White", Speed = 43, Make = "Ford"} }; Console.ReadLine(); }

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Applying a LINQ query to a generic container is no different than doing so with a simple array, as LINQ to Objects can be used on any type implementing IEnumerable<T>. This time, your goal is to build a query expression to select only the Car objects within the myCars list, where the speed is greater than 55. Once you get the subset, you will print out the name of each Car object by calling the PetName property. Assume you have the following helper method (taking a List<Car> parameter), which is called from within Main(): static void GetFastCars(List<Car> myCars) { // Find all Car objects in the List<>, where the Speed is // greater than 55. var fastCars = from c in myCars where c.Speed > 55 select c; foreach (var car in fastCars) { Console.WriteLine("{0} is going too fast!", car.PetName); } } Notice that your query expression is only grabbing items from the List<T> where the Speed property is greater than 55. If you run the application, you will find that Henry and Daisy are the only two items that match the search criteria. If you want to build a more complex query, you might wish to only find the BMWs that have a Speed value above 90. To do so, simply build a compound Boolean statement using the C# && operator:

static void GetFastBMWs(List<Car> myCars) { // Find the fast BMWs! var fastCars = from c in myCars where c.Speed > 90 && c.Make == "BMW" select c; foreach (var car in fastCars) { Console.WriteLine("{0} is going too fast!", car.PetName); } } In this case, the only pet name printed out is Henry .