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Source Code

The CarDelegateWithLambdas project can be found under the Chapter 11 subdirectory.

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

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Lambda Expressions with Multiple (or Zero) Parameters

Each of the lambda expressions you have seen here processed a single parameter. This is not a

requirement, however, as a lambda expression may process multiple arguments or provide no

arguments whatsoever. To illustrate the first scenario, create a final Console Application named

LambdaExpressionsMultipleParams. Next, assume the following incarnation of the SimpleMath type:

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 follows:

static void Main(string[] args)

{