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Another delegate-and-event-centric feature of C# is termed method group conversion. This feature allows you to register the simple name of an event handler. To illustrate, let s revisit the SimpleMath type examined earlier in this chapter, which is now updated with a new event named ComputationFinished: public class SimpleMath { // Not bothering to create a System.EventArgs // derived type here. public delegate void MathMessage(string msg); public event MathMessage ComputationFinished; public int Add(int x, int y) { ComputationFinished("Adding complete."); return x + y; } public int Subtract(int x, int y) { ComputationFinished("Subtracting complete."); return x - y; } } If we are not using anonymous method syntax, you know that the way we would handle the ComputationComplete event is as follows: class Program { static void Main(string[] args) { SimpleMath m = new SimpleMath(); m.ComputationFinished += new SimpleMath.MathMessage(ComputationFinishedHandler); Console.WriteLine("10 + 10 is {0}", m.Add(10, 10)); Console.ReadLine(); } static void ComputationFinishedHandler(string msg) { Console.WriteLine(msg); } } However, we can register the event handler with a specific event like this (the remainder of the code is identical): m.ComputationFinished += ComputationFinishedHandler;

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You may use a SQL login module if the user and group information is stored in a database. This is implemented using the class org.apache.geronimo.security.realm.providers. SQLLoginModule. The options in Table 10-3 are required to configure a SQL login module.

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Notice that we are not directly new-ing the associated delegate type, but rather simply specifying a method that matches the delegate s expected signature (a method returning nothing and taking a single System.String in this case). Understand that the C# compiler is still ensuring type safety. Thus, if the ComputationFinishedHandler() method did not take a System.String and return void, we would be issued a compiler error. It is also possible to explicitly convert an event hander into an instance of the delegate it relates to. This can be helpful if you need to obtain the underlying delegate using a predefined method. For example: // .NET 2.0 allows event handlers to be converted into // their underlying delegate. SimpleMath.MathMessage mmDelegate = (SimpleMath.MathMessage)ComputationFinishedHandler; Console.WriteLine(mmDelegate.Method); If you executed this code, the final Console.WriteLine() prints out the signature of Computation FinishedHandler, as shown in Figure 8-9.

Summary

Figure 9-4. Comparison between the web.xml file used in the previous example and the new web.xml that uses the remoting service

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In this chapter, you have examined a number of ways in which multiple objects can partake in a bidirectional conversation. First, you examined the use of callback interfaces, which provide a way to have object B make calls on object A through a common interface type. Do understand that this design pattern is not specific to .NET, but may be employed in any language or platform that honors the use of interface-based programming techniques. Next, you examined the C# delegate keyword, which is used to indirectly construct a class derived from System.MulticastDelegate. As you have seen, a delegate is simply an object that maintains a list of methods to call when told to do so. These invocations may be made synchronously (using the Invoke() method) or asynchronously (via the BeginInvoke() and EndInvoke() methods). Again, the asynchronous nature of .NET delegate types will be examined at a later time.

You then examined the C# event keyword which, when used in conjunction with a delegate type, can simplify the process of sending your event notifications to awaiting callers. As shown via the resulting CIL, the .NET event model maps to hidden calls on the System.Delegate/System.MulticastDelegate types. In this light, the C# event keyword is purely optional in that it simply saves you some typing time. Finally, this chapter examined a new C# 2005 language feature termed anonymous methods. Using this syntactic construct, you are able to directly associate a block of code statements to a given event. As you have seen, anonymous methods are free to ignore the parameters sent by the event and have access to the outer variables of the defining method. Last but not least, you examined a simplified way to register events using method group conversion.