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Delegates
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12.1 12.2 12.3 12.4 Delegates revisited 204 The ThreadStart delegate 207 Callbacks 208 Handling thread exceptions in Windows Forms 214 12.5 Asynchronous delegates 216 12.6 Creating and invoking dynamic delegates 219 12.7 Summary 221
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Delegates are a powerful means of associating methods and instances of objects. They are one of the largest areas of innovation of the .NET platform. Delegates are intertwined throughout not only multithreaded development in .NET, but also general development. This chapter covers the delegates associated with multithreaded development. Additionally, it covers asynchronous execution of delegates. Asynchronous delegates are those invoked using the BeginInvoke method. An important aspect of any asynchronous development is determining when a task has completed, and gathering any results. This is accomplished using the EndInvoke method. The AsyncCallback delegate allows a method to be invoked when an asynchronous task completes. The chapter concludes with a discussion of dynamic delegates. This is a form of late binding, where the method and object associated with it are determined at runtime.
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DELEGATES REVISITED
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A common need in programming is to be notified when something happens. There are two basic ways to deal with this need: polling and notification. One way to know if something happens is to frequently check to see if what is being watched meets some criteria. This is generally referred to as polling. The problem with polling is that the interval between checks is constant, while the occurrence 204
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of the phenomenon being monitored likely is not. This means that if the interval of checking is one hour, it may be that the phenomenon occurs and goes unnoticed for 59 minutes. Additionally, if more than one occurrence of the phenomenon occurs during the interval, only one instance is captured.
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Polling is the process of repeatedly checking the status of some decision criteria to determine if predefined criteria have been met. The duration between the time the criteria are met and the time they are detected can be referred to as latency.
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Think of polling as the time-old question that almost every child asks often more than once during a trip. Are we there yet The child is polling to determine if the phenomenon he or she is concerned with has occurred. The general response from parents is Not yet, I ll tell you when we get there. This brings us to the other common way of checking to see if something happens: notification. Notification requires some means of communication between the entity being notified and the entity doing the notification. In the .NET framework this is accomplished by using a delegate. The history behind delegates can be traced back to function pointers in C/C++.
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Delegate
A delegate is a type-safe, object-oriented means of referencing, and eventually invoking, a method as though it were any other variable. They are often referred to as type-safe function pointers.
A delegate is an object that associates a method with an optional instance of another object. This allows a delegate to be invoked on an instance of a class, not only on static methods. This is a major improvement over function pointers that required the method that was having its address taken be static. Figure 12.1 demonstrates using a delegate.
Using a delegate
First, there must be a delegate declaration. This tells the compiler what the methods that will be associated with the delegate must look like, in terms of parameters and return value. An example of a declaration of a delegate is:
delegate void SimpleDelegate();
This delegate can only be used with methods that do not accept parameters and do not return a value. Attempting to associate the delegate with some other type of method will produce a compile error. This is a powerful feature of delegates. This means that DELEGATES REVISITED 205
delegates can be used without fear that the method does not match the delegate s definition, since this will result in a compile-time error.
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