This print for content only-size & color not accurate 7" X 9-1/4" / casebound / malloy

// Make a list of integers.

List list = new List();

list.AddRange(new int[] { 20, 1, 4, 8, 9, 44 });

// Now, use a C# 2008 lambda expression.

List evenNumbers = list.FindAll(i => (i % 2) == 0);

C H A P T E R   1 1  

■

D E L E G AT E S, E V E N T S, A N D   L A M B D A S

375

8849CH11.qxd  10/1/07  10:43 AM  Page 375

---

Console.WriteLine("Here are your even numbers:");

foreach (int evenNumber in evenNumbers)

{

Console.Write("{0}\t", evenNumber);

}

Console.WriteLine();

}

In this case, notice the rather strange statement of code passed into the FindAll() method,

which is in fact a lambda expression. Notice that in this iteration of the example, there is no trace

whatsoever of the Predicate delegate (or the delegate keyword for that matter). All we have

specified is the lambda expression: i => (i % 2) == 0.

Before we break this syntax down, at this level simply understand that lambda expressions can

be used anywhere you would have used an anonymous method or a strongly typed delegate (typi-

cally with far fewer keystrokes). Under the hood, the C# compiler translates our expression into a

standard anonymous method making use of the Predicate delegate type (which can be verified

using ildasm.exe or reflector.exe). Specifically, the following code statement: