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I m going to demonstrate how explicitly implementing an event can be used to efficiently implement a class that offers many events However, there are certainly other scenarios where you might want to explicitly implement a type s event To efficiently store event delegates, each object that exposes events will maintain a collection (usually a dictionary) with some sort of event identifier as the key and a delegate list as the value When a new object is constructed, this collection is empty When interest in an event is registered, the event s identifier is looked up in the collection If the event identifier is there, the new delegate is combined with the list of delegates for this event If the event identifier isn t in the collection, the event identifier is added with the delegate .

8. Click OK. The Computer Name Changes message box appears, welcoming you to the domain1.local domain. 9. Click OK. A message box indicates that you need to restart the computer for the changes to take effect. 10. Click OK, and then click OK in the System Properties dialog box. The System Settings Change message box appears, asking whether you want to restart the computer now. 11. Click Yes to restart the computer. Computer2 restarts.

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When the object needs to raise an event, the event identifier is looked up in the collection If the collection doesn t have an entry for the event identifier, nothing has registered interest in the event and no delegates need to be called back If the event identifier is in the collection, the delegate list associated with the event identifier is invoked Implementing this design pattern is the responsibility of the developer who is designing the type that defines the events; the developer using the type has no idea how the events are implemented internally ..

The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. How can you use forwarding to increase security of DNS queries

This chapter details the basic syntax, structure, and features of the C# language. We expect the reader to be familiar with the Java language, and we concentrate on C# features that are new or different.

2. Using the DNS server properties dialog box, how can you prevent a multihomed DNS server from answering DNS queries received through specific network cards

Here is an example of how you could accomplish this pattern . First, I implemented an EventSet class that represents a collection of events and each event s delegate list as follows:

3. You administer a network that consists of a single domain. On this network, you have configured a new DNS server named DNS1 to answer queries for Internet names from the local domain. However, although DNS1 is connected to the Internet, it continues to fail its recursive test on the Monitoring tab of the server properties dialog box. Which of the following could be the potential cause for the failure

using System; using System.Collections.Generic; // This class exists to provide a bit more type safety and // code maintainability when using EventSet public sealed class EventKey : Object { } public sealed class EventSet { // The private dictionary used to maintain EventKey -> Delegate mappings private readonly Dictionary<EventKey, Delegate> m_events = newDictionary<EventKey, Delegate>(); // Adds an EventKey -> Delegate mapping if it doesn't exist or // combines a delegate to an existing EventKey public void Add(EventKey eventKey, Delegate handler) { Monitor.Enter(m_events); Delegate d; m_events.TryGetValue(eventKey, out d); m_events[eventKey] = Delegate.Combine(d, handler); Monitor.Exit(m_events); } // Removes a delegate from an EventKey (if it exists) and // removes the EventKey -> Delegate mapping the last delegate is removed public void Remove(EventKey eventKey, Delegate handler) { Monitor.Enter(m_events); // Call TryGetValue to ensure that an exception is not thrown if // attempting to remove a delegate from an EventKey not in the set Delegate d; if (m_events.TryGetValue(eventKey, out d)) { d = Delegate.Remove(d, handler); // If a delegate remains, set the new head else remove the EventKey if (d != null) m_events[eventKey] = d; else m_events.Remove(eventKey); } Monitor.Exit(m_events); } // Raises the event for the indicated EventKey public void Raise(EventKey eventKey, Object sender, EventArgs e) { // Don't throw an exception if the EventKey is not in the set Delegate d; Monitor.Enter(m_events); m_events.TryGetValue(eventKey, out d); Monitor.Exit(m_events); if (d // // // // != null) { Because the dictionary can contain several different delegate types, it is impossible to construct a type-safe call to the delegate at compile time. So, I call the System.Delegate type's DynamicInvoke method, passing it the callback method's parameters as an array of

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