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We ve returned our nonsense value from the class initialization code. Now let s assign values to our properties. Type the following commands into the Immediate window, pressing Enter after each. The first group of commands will set the cEmployee object s properties and the second will retrieve and display them. emp.ID = 15 emp.Name = "John Doe" emp.Title = "Analyst" emp.PhoneNumber = "8885555555" emp.name emp.ID emp.title emp.phonenumber set emp = Nothing Your Immediate window should look like Figure 1-31.

Event interfaces can be helpful in that they can be used under any language or platform (.NET, J2EE, or otherwise) that supports interface-based programming. However, as you may be suspecting, the .NET platform defines an official event protocol. To understand this intrinsic event architecture, we begin by examining the role of the delegate type.

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Before formally defining .NET delegates, let s gain a bit of perspective. Historically speaking, the Windows API makes frequent use of C-style function pointers to create entities termed callback functions or simply callbacks. Using callbacks, programmers were able to configure one function to report back to (call back) another function in the application. The problem with standard C-style callback functions is that they represent little more than a raw address in memory. Ideally, callbacks could be configured to include additional type-safe information such as the number of (and types of) parameters and the return value (if any) of the method pointed to. Sadly, this is not the case in traditional callback functions, and, as you may suspect, can therefore be a frequent source of bugs, hard crashes, and other runtime disasters. Nevertheless, callbacks are useful entities. In the .NET Framework, callbacks are still possible, and their functionality is accomplished in a much safer and more object-oriented manner using delegates. In essence, a delegate is a type-safe object that points to another method (or possibly multiple methods) in the application, which can be invoked at a later time. Specifically speaking, a delegate type maintains three important pieces of information: The name of the method on which it makes calls The arguments (if any) of this method The return value (if any) of this method

Once a delegate has been created and provided the aforementioned information, it may dynamically invoke the method(s) it points to at runtime. As you will see, every delegate in the .NET Framework (including your custom delegates) is automatically endowed with the ability to call their methods synchronously or asynchronously. This fact greatly simplifies programming tasks, given that we can call a method on a secondary thread of execution without manually creating and managing a Thread object. We will examine the asynchronous behavior of delegate types during our investigation of the System. Threading namespace in 14.

both;

Defining a Delegate in C#

Figure 1-31. cEmployee object with property values set and returned Let s take a look at what s going on here. The first line of code instantiates (or creates) the employee object: Set emp = New cEmployee When that object is created, the Class_Initialize method fires and the default values are set. As mentioned earlier, this is where you would set up any activities or objects your class needs to have in place. Next, a quick check of the Name property is done to see that it is holding your default value in this case the nonsense value NOG. The next four lines set all of the properties of the Employee object with real values: emp.ID = 15 emp.Name = "John Doe" emp.Title = "Analyst" emp.PhoneNumber = "8885555555"

When you want to create a delegate in C#, you make use of the delegate keyword. The name of your delegate can be whatever you desire. However, you must define the delegate to match the signature of the method it will point to. For example, assume you wish to build a delegate named BinaryOp that can point to any method that returns an integer and takes two integers as input parameters:

// This delegate can point to any method, // taking two integers and returning an // integer. public delegate int BinaryOp(int x, int y); When the C# compiler processes delegate types, it automatically generates a sealed class deriving from System.MulticastDelegate. This class (in conjunction with its base class, System.Delegate) provides the necessary infrastructure for the delegate to hold onto the list of methods to be invoked at a later time. For example, if you examine the BinaryOp delegate using ildasm.exe, you would find the items shown in Figure 8-2.

This code works like a charm, as you can see in Figure 11-10.

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