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Console.ReadLine(); } // Delegate targets. public static void CarAboutToBlow(string msg) { Console.WriteLine(msg); } public static void CarExploded(string msg) { Console.WriteLine(msg); } } Now, here is a retrofitted version of Main() making use of anonymous method syntax: static void Main(string[] args) { Console.WriteLine("***** More Fun with Lambdas *****\n"); // Make a car as usual. Car c1 = new Car("SlugBug", 100, 10); // Now use anonymous methods. c1.OnAboutToBlow(delegate(string msg) { Console.WriteLine(msg); }); c1.OnExploded(delegate(string msg) { Console.WriteLine(msg); }); // Speed up (this will generate the events). Console.WriteLine("\n***** Speeding up *****"); for (int i = 0; i < 6; i++) c1.SpeedUp(20); Console.ReadLine(); } And finally, here is a version of the Main() method using lambda expression syntax: static void Main(string[] args) { Console.WriteLine("***** More Fun with Lambdas *****\n"); // Make a car as usual. Car c1 = new Car("SlugBug", 100, 10); // Now with lambdas! c1.OnAboutToBlow(msg => { Console.WriteLine(msg); }); c1.OnExploded(msg => { Console.WriteLine(msg); }); // Speed up (this will generate the events). Console.WriteLine("\n***** Speeding up *****"); for (int i = 0; i < 6; i++) c1.SpeedUp(20); Console.ReadLine(); } Understand that in each case, the output is identical (see Figure 30-8). While you may agree that the lambda expression syntax is far and away the most compact and functional approach, remember that this technique is always optional.

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After we stop the Macro Recorder, we are left with code that looks like Listing 2-2. Listing 2-2. Macro-Generated Text Data Import Code Sub GetTextData() ' ' GetTextData Macro '

Figure 30-8. Traditional delegate syntax, anonymous method syntax, and lambda expression syntax each yield the same output.

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Each of the lambda expressions we have seen here processed a single parameter. This is not a requirement, however: a lambda expression may process multiple arguments or provide no arguments whatsoever. To illustrate the first scenario, assume the following incarnation of the SimpleMath type first seen in 8: public class SimpleMath { public delegate void MathMessage(string msg, int result); private MathMessage mmDelegate; public void SetMathHandler(MathMessage target) { mmDelegate = target; } public void Add(int x, int y) { if (mmDelegate != null) mmDelegate.Invoke("Adding has completed!", x + y); } } Notice that the MathMessage delegate is expecting two parameters. To represent them as a lambda expression, our Main() method might be written as so: static void Main(string[] args) { // Register w/ delegate as a lambda expression. SimpleMath m = new SimpleMath(); m.SetMathHandler((msg, result) => {Console.WriteLine("Message: {0}, Result: {1}", msg, result);}); // This will execute the lambda expression. m.Add(10, 10); Console.ReadLine(); }

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Here, we are leveraging type inference, as our two parameters have not been strongly typed for simplicity. We could, however, call SetMathHandler(): m.SetMathHandler((string msg, int result) => {Console.WriteLine("Message: {0}, Result: {1}", msg, result);}); Finally, if you are using a lambda expression to interact with a delegate taking no parameters at all, you may do so by supplying a pair of empty parentheses as the parameter. For example, assuming you have defined the following delegate type: public delegate string VerySimpleDelegate(); you could handle the result of the invocation as follows: // Prints "Enjoy your string!" to the console. VerySimpleDelegate d = new VerySimpleDelegate( () => {return "Enjoy your string!";} ); Console.WriteLine(d.Invoke()); I hope at this point that you can see the overall role of lambda expressions and understand how they provide a functional manner to work with anonymous methods and delegate types. Furthermore, as you explore LINQ, you will also find that lambdas are used quite frequently to simplify working with relational data and XML documents.

C# 3.0 also allows you to represent lambda expressions as an in-memory object using expression trees. This can be very useful for third parties who are building software that needs to extend the functionality of existing lambdas. I suspect that the majority of C# projects will not require this functionality, so check out the .NET Framework SDK documentation for further details if you are interested.

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