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evnt[i] = null; break; } if (i == 3) ConsoleWriteLine("Event handler not found"); } } // This is called to raise the events public void OnSomeEvent() { for(int i=0; i < 3; i++) if(evnt[i] != null) evnt[i](); } } // Create some classes that use MyEventHandler class W { public void Whandler() { ConsoleWriteLine("Event received by W object"); } } class X { public void Xhandler() { ConsoleWriteLine("Event received by X object"); } } class Y { public void Yhandler() { ConsoleWriteLine("Event received by Y object"); } } class Z { public void Zhandler() { ConsoleWriteLine("Event received by Z object"); } } class EventDemo5 { static void Main() { MyEvent evt = new MyEvent(); W wOb = new W(); X xOb = new X(); Y yOb = new Y(); Z zOb = new Z(); // Add handlers to the event list ConsoleWriteLine("Adding events"); evtSomeEvent += wObWhandler; evtSomeEvent += xObXhandler; evtSomeEvent += yObYhandler;

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// Can't store this one -- full evtSomeEvent += zObZhandler; ConsoleWriteLine();

Using prepositions properly is a hallmark of professionalism in both speech and writing, but learning which preposition to use in which circumstance requires memorization This appendix does not attempt to list all prepositions in all applications Rather, it will clear up some areas of confusion (eg, The sale is extended to September 1st vs The sale is extended through September 1st)

// Raise the events evtOnSomeEvent(); ConsoleWriteLine(); // Remove a handler ConsoleWriteLine("Remove xObXhandler"); evtSomeEvent -= xObXhandler; evtOnSomeEvent(); ConsoleWriteLine(); // Try to remove it again ConsoleWriteLine("Try to remove xObXhandler again"); evtSomeEvent -= xObXhandler; evtOnSomeEvent(); ConsoleWriteLine(); // Now, add Zhandler ConsoleWriteLine("Add zObZhandler"); evtSomeEvent += zObZhandler; evtOnSomeEvent(); } }

The output from the program is shown here:

9 (a)

Adding events Event list full Event received by W object Event received by X object Event received by Y object Remove xObXhandler Event received by W object Event received by Y object Try to remove xObXhandler again Event handler not found Event received by W object Event received by Y object Add zObZhandler Event received by W object Event received by Z object Event received by Y object

Part I:

Let s examine this program closely First, an event handler delegate called MyEventHandler is defined Next, the class MyEvent is declared It begins by defining a three-element array of event handlers called evnt, as shown here:

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MyEventHandler[] evnt = new MyEventHandler[3];

This array will be used to store the event handlers that are added to the event chain The elements in evnt are initialized to null by default Next, the event SomeEvent is declared It uses the accessor form of the event statement, as shown here:

public event MyEventHandler SomeEvent { // Add an event to the list add { int i; for(i=0; i < 3; i++) if(evnt[i] == null) { evnt[i] = value; break; } if (i == 3) ConsoleWriteLine("Event queue full"); } // Remove an event from the list remove { int i; for(i=0; i < 3; i++) if(evnt[i] == value) { evnt[i] = null; break; } if (i == 3) ConsoleWriteLine("Event handler not found"); } }

Certain words must be followed by certain prepositions in order to achieve clarity Learning these combinations will help you conform to professional standards in business writing The following list of common combinations clari es which preposition to use when account for (to explain or justify something missing) account to (to explain or justify something to someone) He needs to account for his absence at the client meeting He will have to account to Mr Peterson for missing the client meeting

When an event handler is added, add is called and a reference to the handler (contained in value) is put into the first unused (that is, null) element of evnt If no element is free, then an error is reported (Of course, throwing an exception when the list is full would be a better approach for real-world code) Since evnt is only three elements long, only three event handlers can be stored When an event handler is removed, remove is called and the evnt array is searched for the reference to the handler passed in value If it is found, its element in the array is assigned null, thus removing the handler from the list When an event is raised, OnSomeEvent( ) is called It cycles through the evnt array, calling each event handler in turn As the preceding example shows, it is relatively easy to implement a custom eventhandler storage mechanism if one is needed For most applications, though, the default storage provided by the non-accessor form of event is better The accessor-based form of event can be useful in certain specialized situations, however For example, if you have a program in which event handlers need to be executed in order of their priority and not in the order in which they are added to the chain, then you could use a priority queue to store the handlers

10 (a) (b)

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