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method internally does nothing . That is, you get no exception or warning of any type; the event s collection of methods remains unchanged .

WithdrawalTransaction withdrawal; withdrawal.SetCustomerId( customerId ); withdrawal.SetBalance( balance ); withdrawal.SetWithdrawalAmount( withdrawalAmount ); withdrawal.SetWithdrawalDate( withdrawalDate ); ProcessWithdrawal( withdrawal ); customerId = withdrawal.GetCustomerId(); balance = withdrawal.GetBalance(); withdrawalAmount = withdrawal.GetWithdrawalAmount(); withdrawalDate = withdrawal.GetWithdrawalDate();

Unfortunately, the assemblies you want to analyze are hard coded in the FxCop project file. Even if you choose to have the relative or absolute path to the targets and you re using the standard Debug or Release scenario, you ll end up with one of the output directories being written into the FxCop project file:

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In this example, the add and remove methods are public . The reason they are public is that the original line of source code declared the event to be public . If the event had been declared protected, the add and remove methods generated by the compiler would also have been declared protected . So, when you define an event in a type, the accessibility of the event determines what code can register and unregister interest in the event, but only the type itself can ever access the delegate field directly . Event members can also be declared as static or virtual, in which case the add and remove methods generated by the compiler would be either static or virtual, respectively . In addition to emitting the aforementioned three constructs, compilers also emit an event definition entry into the managed assembly s metadata . This entry contains some flags and the underlying delegate type, and refers to the add and remove accessor methods . This information exists simply to draw an association between the abstract concept of an event and its accessor methods . Compilers and other tools can use this metadata, and this information can also be obtained by using the System.Reflection.EventInfo class . However, the CLR itself doesn t use this metadata information and requires only the accessor methods at runtime .

A similar warning sign is when you find yourself creating a special constructor for the WithdrawalTransaction class that takes a subset of its normal initialization data so that you can write code like this:

The hard work is definitely behind you at this point . In this section, I ll show you how to define a type that uses an event provided by another type . Let s start off by examining the code for the Fax type:

withdrawal = new WithdrawalTransaction( customerId, balance, withdrawalAmount, withdrawalDate ); ProcessWithdrawal( withdrawal ); delete withdrawal;

internal sealed class Fax { // Pass the MailManager object to the constructor public Fax(MailManager mm) { // Construct an instance of the EventHandler<NewMailEventArgs> // delegate that refers to our FaxMsg callback method. // Register our callback with MailManager's NewMail event mm.NewMail += FaxMsg; } // This is the method the MailManager will call // when a new e-mail message arrives private void FaxMsg(Object sender, NewMailEventArgs e) { // 'sender' identifies the MailManager object in case // we want to communicate back to it. // 'e' identifies the additional event information // the MailManager wants to give us. // Normally, the code here would fax the e-mail message. // This test implementation displays the info in the console Console.WriteLine("Faxing mail message:"); Console.WriteLine(" From={0}, To={1}, Subject={2}", e.From, e.To, e.Subject); } // This method could be executed to have the Fax object unregister // itself with the NewMail event so that it no longer receives // notifications public void Unregister(MailManager mm) { // Unregister with MailManager's NewMail event mm.NewMail -= FaxMsg; } }

When the e-mail application initializes, it would first construct a MailManager object and save the reference to this object in a variable . Then the application would construct a Fax object, passing the reference to the MailManager object as a parameter . In the Fax constructor, the Fax object registers its interest in MailManager s NewMail event using C# s += operator:

Anytime you see code that sets up for a call to a routine or takes down after a call to a routine, ask whether the routine interface is presenting the right abstraction. In this case, perhaps the ProcessWithdrawal() routine should be added to the WithdrawalTransaction class, or perhaps the parameter list of ProcessWithdrawal should be modified to support code like this: