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Figure 24-2. Projecting data to a new representation Of course, you don t need to use anonymous types when you perform a projection. You can define the type formally and then use it in your expression. For example, if you created the following EmployeeName class: public class EmployeeName { public string FirstName { get; set; } public string LastName { get; set; } } you could change EmployeeDetails objects into EmployeeName objects in your query expression like this: var matches = from employee in employees select new EmployeeName {FirstName = employee.FirstName, LastName = employee.LastName}; This query expression works because the FirstName and LastName properties are publicly accessible and aren t read-only. After creating the EmployeeName object, LINQ sets these properties. Alternatively, you could add a set of parentheses after the EmployeeName class name and supply arguments for a parameterized constructor, like this: var matches = from employee in employees select new EmployeeName(FirstName, LastName);

The difference between ByVal and ByRef is straightforward when you re using value types, such as integers. However, if you use reference types, such as a Product object or an array, you won t see this behavior. The reason is because the entire object isn t passed in the parameter. Instead, it s just the reference that s transmitted. This is much more efficient for large objects (it saves having to copy a large block of memory), but it doesn t always lead to the behavior you expect. To understand the difference, consider this method: Private Sub ProcessProduct(ByVal prod As Product) prod.Price *= 2 End Sub This code accepts a Product object and increases the price by a factor of 2. Because the Product object is passed by value, you might reasonably expect that the ProcessProduct() method receives a copy of the Product object. However, this isn t the case. Instead, the ProcessProduct() method gets a copy of the reference. However, this new reference still points to the same inmemory Product object. That means that the change shown in this example will affect the calling code.

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In the first LINQ example in this chapter, you saw how a where clause can filter the results to include only those that match a specific condition For example, you can use this code to find employees who have a last name that starts with a specific letter: var matches = from employee in employees where employeeLastNameStartsWith("D") select employee; The where clause takes a conditional expression that s evaluated for each item If it s true, the item is included in the result However, LINQ keeps the same deferred execution model, which means the where clause isn t evaluated until you actually attempt to iterate over the results As you probably already expect, you can combine multiple conditional expressions with the and (&&) and or (||) operators, and you can use relational operators (such as <, <=, >, and >=) in conjunction with hard-coded values or other variables.

So far, the discussion has focused on simple data types and classes. The .NET class library is actually composed of types, which is a catchall term that includes several object-like relatives: Classes: This is the most common type in .NET Framework. Strings and arrays are two examples of .NET classes, although you can easily create your own. Structures: Structures, like classes, can include fields, properties, methods, and events. Unlike classes, they are value types, which alters the way they behave with assignment and comparison operations. Structures also lack some of the more advanced class features (such as inheritance) and are generally simpler and smaller. Integers, dates, and characters are all structures.

For example, you could create a query like this to filter out products greater than a certain price threshold: var matches = from product in products where productUnitsInStock > 0 && productUnitPrice > 300M select product; One interesting feature of LINQ expressions is that you can easily call your own methods inline For example, you could create a function named TestEmployee() that examines an employee and returns true or false based on whether you want to include it in the results: private bool TestEmployee(Employee employee) { return employeeLastNameStartsWith("D"); } You could then use the TestEmployee() method like this: var matches = from employee in employees where TestEmployee(employee) select employee; The orderby operator is equally straightforward It s modeled after the syntax of the Select statement in SQL You simply provide a list of one or more values to use for sorting, separated by commas.

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