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namespace Example_21_1_ _ _ _Querying_Collections { // simple book class public class Book { public string Title { get; set; } public string Author { get; set; } public string Publisher { get; set; } public int PublicationYear { get; set; } } class Program { static void Main(string[] args) { List<Book> bookList = new List<Book> { new Book { Title = "Learning C# 3.0", Author = "Jesse Liberty", Publisher = "O'Reilly", PublicationYear = 2008 }, new Book { Title = "Programming C# 3.0", Author = "Jesse Liberty", Publisher = "O'Reilly", PublicationYear = 2008 }, new Book { Title = "C# 3.0 Cookbook", Author = "Jay Hilyard", Publisher = "O'Reilly", PublicationYear = 2007 }, new Book { Title = "C# 3.0 in a Nutshell", Author = "Ben Albahari", Publisher = "O'Reilly", PublicationYear = 2007 }, new Book { Title = "Head First C#", Author = "Andrew Stellman", Publisher = "O'Reilly", PublicationYear = 2007 }, new Book { Title = "Programming C#, fourth edition", Author = "Jesse Liberty", Publisher = "O'Reilly", PublicationYear = 2005 } }; // find books by Jesse Liberty

Because the Background layer is locked, you will generally want to start out by creating or adding new layers There are several ways to add layers to an image

IEnumerable<Book> resultsAuthor = from testBook in bookList where testBook.Author == "Jesse Liberty" select testBook; Console.WriteLine("Books by Jesse Liberty:"); foreach (Book testBook in resultsAuthor) { Console.WriteLine("{0}, by {1}", testBook.Title, testBook.Author); } // find books published before 2008 IEnumerable<Book> resultsDate = from testBook in bookList where testBook.PublicationYear < 2008 select testBook; Console.WriteLine("\nBooks published before 2008:"); foreach (Book testBook in resultsDate) { Console.WriteLine("{0}, by {1}, {2}", testBook.Title, testBook.Author, testBook.PublicationYear); } } } }

.

The output looks like this:

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Books by Jesse Liberty: Learning C# 3.0, by Jesse Liberty Programming C# 3.0, by Jesse Liberty Programming C#, fourth edition, by Jesse Liberty Books published before 2008: C# 3.0 Cookbook, by Jay Hilyard, 2007 C# 3.0 in a Nutshell, by Ben Albahari, 2007 Head First C#, by Andrew Stellman, 2007 Programming C#, fourth edition, by Jesse Liberty, 2005

You might expect that the data would be retrieved from the data source when you create the IEnumerable<T> instance to hold the results. In fact, the data isn t retrieved until you try to do something with the data in the IEnumerable<T>. In this case, that s when you output the contents in the foreach statement. This behavior is helpful because databases with many connections may be changing all the time; LINQ doesn t retrieve the data until the last possible moment, right before you re going to use it.

To create a new empty layer, click the Create a new layer icon located at the bottom edge of the Layers palette This creates a new layer, named Layer 1, positioned above the Background layer as shown here

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In Example 21-1, when you retrieve the information from the collection, you retrieve the entire Book object, but you output only the title and author. That s somewhat wasteful, because you re retrieving more information than you actually need. Since you need just the title and author, it would be preferable to be able to say something like this:

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