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CHAPTER 27 LINQ TO OBJECTS
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In this example, I create a range variable for two data sources and use them in a LINQ query that uses a select clause to create an anonymous type. A new object will be created for each combination of values from the data sources. Compiling and running Listing 27-35 produces the following output: Result - Name: Result - Name: Result - Name: Result - Name: Result - Name: Result - Name: Result - Name: Result - Name: Result - Name: Press enter to apple, Size: small apple, Size: medium apple, Size: large plum, Size: small plum, Size: medium plum, Size: large cherry, Size: small cherry, Size: medium cherry, Size: large finish
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Creating Additional Range Variables
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As you can see from the join and combination operations, having additional range variables can be useful. You can create your own and assign any value you want to it by using the let keyword. Listing 2736 provides a demonstration. Listing 27-36. Creating a arrange Variable with the let Keyword using System; using System.Collections.Generic; using System.Linq; 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 36 { static void Main(string[] args) { // 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),
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CHAPTER 27 LINQ TO OBJECTS
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new Fruit("Banana", "Yellow", 100), new Fruit("Grape", "Green", 400) }; // perform the query IEnumerable<string> results = from e in myFruitList let nameLength = e.Name.Length let lowStock = e.ItemsInStock < 200 where nameLength > 4 && lowStock select e.Name; // enumerate the results foreach (string str in results) { Console.WriteLine("Result: {0}", str); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The query in Listing 27-36 defines two additional range variables using the let keyword, and both are derived from the main range variable e. The nameLength range variable is assigned the length of the Name property of the current Fruit object. The lowStock range variable is assigned true if the ItemsInStock property of the current Fruit object is lower than 200 and false otherwise. Figure 27-9 illustrates the use of the let keyword to create additional range variables.
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Figure 27-9. The anatomy of the let keyword When you assign a new range variable a value that is derived from the main range variable, a new value will be calculated for each item in the data source. In the case of Listing 27-36, that means the length of the Name property and the value of the ItemsInStock property will be used to create new values for the nameLength and lowStock range variables each time the Fruit assigned to e, the main range variable, changes.
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Tip Range variables apply only when you are using query syntax. When using method syntax, you can create local variables within your lambda expressions.
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CHAPTER 27 LINQ TO OBJECTS
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In this chapter, you were introduced to the world of LINQ and saw some demonstrations of using LINQ to Objects. LINQ can take a little while to get used to, but the flexibility and elegance that it can bring to a program is worth the investment in time. One of the best features of LINQ is consistency. As you will see the chapters that follow, everything that you have learned about to LINQ to Objects can be applied to LINQ to XML, LINQ to Entities, and so on. There are differences, but they are not as great as you might expect. I have lost count of the number of times that I have been able to perform complex data transformations using LINQ to reduce complex legacy programs to a handful of simple queries. I encourage you to dig further into the details of LINQ and take the time to master of the best features available in C#.
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