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You have to specify some way to correlate the information in the two collections, though how can you tell which orders go with which book records They have the Title property in common. If the Title property of the book is the same as the Title property of the order, that s a match. The on part of the join clause indicates that you re defining the condition:
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join myOrder in orderList on myBook.Title equals myOrder.Title
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Note that you have to use the keyword equals to define the join condition, rather than the == operator. The where clause specifies that you want the records of orders with more than 50 copies sold. A full example using this query is shown in Example 21-5.
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using using using using System; System.Collections.Generic; System.Linq; System.Text;
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namespace Example_21_5_ _ _ _Joining_results { using System; using System.Collections.Generic; using System.Linq; using System.Text; // 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; } } public class PurchaseOrder { public int OrderNumber { get; set; } public string Title { get; set; } public int Quantity { 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 },
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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 } }; List<PurchaseOrder> orderList = new List<PurchaseOrder> { new PurchaseOrder { OrderNumber = 23483, Title = "C# 3.0 Cookbook", Quantity = 57 }, new PurchaseOrder { OrderNumber = 57284, Title = "Head First C#", Quantity = 42 }, new PurchaseOrder { OrderNumber = 56389, Title = "Programming C# 3.0", Quantity = 12 }, new PurchaseOrder { OrderNumber = 95639, Title = "C# 3.0 Cookbook", Quantity = 122 }, new PurchaseOrder { OrderNumber = 57493, Title = "C# 3.0 in a Nutshell", Quantity = 43 }, new PurchaseOrder { OrderNumber = 73558, Title = "Programming C# 3.0", Quantity = 99 }, new PurchaseOrder { OrderNumber = 45385, Title = "C# 3.0 Cookbook", Quantity = 35 }, }; var resultList = from myBook in bookList join myOrder in orderList on myBook.Title equals myOrder.Title where myOrder.Quantity >= 50 select new {myBook.Title, myBook.Author, myOrder.Quantity}; Console.WriteLine("Book orders with quantities greater than 50:"); foreach (var testBook in resultList) { Console.WriteLine("Title: {0}\tAuthor: {1} \tQuantity: {2}", testBook.Title, testBook.Author, testBook.Quantity); } } } }
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21: LINQ
The results of the query look like this:
Book orders with quantities greater than 50: Title: Programming C# 3.0 Author: Jesse Liberty Quantity: 99 Title: C# 3.0 Cookbook Author: Jay Hilyard Quantity: 57 Title: C# 3.0 Cookbook Author: Jay Hilyard Quantity: 122
Using LINQ with SQL
Although using SQL-like syntax with your in-memory collections is the more interesting and unusual use of LINQ, it s natural to use the SQL-like syntax with SQL databases. With LINQ, instead of using the DataAdapter and DataSet classes you learned about in 20, you can treat the tables in a SQL database as classes, and work with the data directly, as though the tables were objects created in your code. Create a new console application to see how this works. To use the LINQ data features, you ll need to add a reference to the System.Data.Linq namespace, which is something you haven t done before, but it s simple. Right-click on the References folder of your project in the Solution Explorer. You ll see the Add Reference dialog shown in Figure 21-1.
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