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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:

Each item appears as a small icon with a label at the right. By default, items can be dragged and placed at any location in the control.

MyEventHandler[] evnt = new MyEventHandler[3];

List Items are arranged as small icons, in columns with no headers, and with the labels on the right.

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"); } }

Items are arranged in columns with headers. Items appear as small icons with the labels on the right, and additional information about each item appears in the columns.

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 fired, 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

Figure 14.1 shows a Form with a ListView control displayed in the Details view mode. This figure illustrates various features and classes used by this control. We will look at these in detail as we progress through the chapter.

15:

Events can be specified in interfaces Implementing classes must supply the event Events can also be specified as abstract A derived class must implement the event Accessor-based events cannot, however, be abstract An event can be specified as sealed Finally, an event can be virtual, which means that it can be overridden in a derived class

An icon taken from an ImageList instance is associated with each item. The primary text associated with each item is called the item label. The ListViewItem class represents a single item in the list. Multiple instances of the ListViewSubItem class represent additional information associated with each item. The ColumnHeader class represents a single column for the list.

Anonymous methods and lambda expressions are especially useful when working with events because often the event handler is not called by any code other than the event handling mechanism As a result, there is usually no reason to create a standalone method Thus, the use of lambda expressions or anonymous methods can significantly streamline event handling code Since lambda expressions are now the preferred approach, we will start there Here is an example that uses a lambda expression as an event handler: