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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 .

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 ..

Duplicate data you can t control. Change unidirectional class association to bidirectional class association. Change bidirectional class association to unidirectional class association. Provide a factory routine rather than a simple constructor. Replace error codes with exceptions or vice versa.

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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:

Figure 8.7 FxCop analysis report on the CCNet Dashboard page. The output from FxCopCmd is formatted using the XSD file supplied by CCNet to provide an easily readable report.

Opening up a working system is more like opening up a human brain and replacing a nerve than opening up a sink and replacing a washer. Would maintenance be easier if it was called Software Brain Surgery Gerald Weinberg

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

Refactoring is a powerful technique for improving code quality. A few simple guidelines can make this powerful technique even more effective.

// objects. Internally, DynamicInvoke will check the type safety of the // parameters with the callback method being called and call the method. // If there is a type mismatch, then DynamicInvoke will throw an exception. d.DynamicInvoke(newObject[] { sender, e }); } }