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using System; namespace MultiDelegate { public delegate void PetDelegate(); class Application { static void Main(string[] args) { // instantiate the pet objects Dog dog = new Dog(); Snake snake = new Snake(); PetDelegate a, b, c, d; // assign the delegates a = new PetDelegate(dogBark); b = new PetDelegate(snakeHiss); // combine a and b as c c = (PetDelegate)DelegateCombine(a, b); // invoke c(), the result should be that the two methods are called c(); ConsoleWrite("\n\n"); // combine c and a into d d = (PetDelegate)DelegateCombine(c, a); // invoke d(), the result should be that three methods are invoked d(); } } public class Dog { public void Bark() { ConsoleWriteLine("WOOF"); } } public class Snake { public void Hiss() { ConsoleWriteLine("Sssssssssssssss"); } } }

Duplicated chromosomes are visible Centrioles begin moving apart; nuclear envelope is fragmenting and will disappear

The output from this example follows, and you can see that there are two groups of invocations (c() and d()) When we call c() we get two lines of output, but when we call d() we get three lines

Microsoft has overloaded some operators in the C# language to make working with delegates easier We can use the plus sign (+) or the += operator rather than using the Combine() method directly Similarly, the minus sign (-) and the -= has been overloaded to give us the Remove() functionality Using this syntax, we can rewrite the previous example as in the following code segment

In the Ford products using the ten-cut system, how many cuts on the key are common to both the door and ignition cylinders A 2 B 4 C 6 D 10

// combine a and b into c c = a + b; // combine c and a into d d = c + a; // remove a from c c = c - a; // or we can use the += and -= operators c += a; c += b' d += c; d -= a;

Now that we ve defined the delegates, we can look at how we declare, connect to, and raise events This is what we have learned so far: We have a class that will raise an event We have code in a second class that will respond to the event by running the code of the handler We now need a technique for connecting the event with the handler so we don t have to continually keep checking for the event That connection is the delegate described in the previous section

The first step in event processing is to declare the event and the delegate that will be used to register clients to the event The following code segment shows how that is done

Which manufacturer is best known for its low-cost residential key-in-knob locks A Kwikset Corporation B Medeco Security Locks C The Key-in-Knob Corporation D ASSA

// declare the delegate for the event public delegate void TravelMugEmptyEventHandler(); public class Mug { // declare the TravelMugEmpty event public static event TravelMugEmptyEventHandler TravelMugEmpty; // }

When we declare a delegate for a method with a void return type, the delegate will be compiled as a MulticastDelegate by the C# compiler, and Combine and Remove methods are added for members from the invocation list The client accesses those methods with the overloaded operators += and -= The client code contains the method to handle the event, as well as the code to connect the method to the event The client code to use the TravelMugEmpty event will look like this:

// The client's event-handling method private void FillMug() { mugRefill(); } // initialization code to connect to the event handler MugTravelMugEmpty += new TravelMugEmptyEventHandler(FillMug);

The most popular mechanical lock brands in the United States include: A Yale, Master, Corby, and Gardall B Yale, Kwikset, Master, and TuffLock C Master, Weiser, Kwikset, and Schlage D Master, Corby, Gardall, and TuffLock