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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

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:

11 (a)

// Use a lambda expression as an event handler using System; // Declare a delegate type for an event delegate void MyEventHandler(int n); // Declare a class that contains an event class MyEvent { public event MyEventHandler SomeEvent; // This is called to raise the event public void OnSomeEvent(int n) { if(SomeEvent != null) SomeEvent(n); } } class LambdaEventDemo { static void Main() { MyEvent evt = new MyEvent(); // Use a lambda expression as an event handler evtSomeEvent += (n) => ConsoleWriteLine("Event received Value is " + n); // Raise the event twice evtOnSomeEvent(1); evtOnSomeEvent(2); } }

Part I:

The output is shown here:

In the program, pay special attention to the way the lambda expression is used as an event handler, as shown here:

j=1 8

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evtSomeEvent += (n) => ConsoleWriteLine("Event received Value is " + n);

The syntax for using a lambda expression event handler is the same as that for using a lambda expression with any other type of delegate Although lambda expressions are now the preferred way to construct an anonymous function, you can still use an anonymous method as an event handler if you so choose For example, here is the event handler from the previous example rewritten to use an anonymous method:

// Use an anonymous method as an event handler evtSomeEvent += delegate(int n) { ConsoleWriteLine("Event received Value is" + n); };

j=1 5

As you can see, the syntax for using an anonymous event handler is the same as that for any anonymous method