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// Indexers don't have to operate on actual arrays using System; class PwrOfTwo { /* Access a logical array that contains the powers of 2 from 0 to 15 */ public int this[int index] { // Compute and return power of 2 get { if((index >= 0) && (index < 16)) return pwr(index); else return -1; } // There is no set accessor } int pwr(int p) { int result = 1; for(int i=0; i < p; i++) result *= 2; return result; } }

Part I:

30 20 10 _6 _4 _2 _ 10 _ 20 _ 30 2 4 6 _6 _4 _2

class UsePwrOfTwo { static void Main() { PwrOfTwo pwr = new PwrOfTwo(); ConsoleWrite("First 8 powers of 2: "); for(int i=0; i < 8; i++) ConsoleWrite(pwr[i] + " "); ConsoleWriteLine(); ConsoleWrite("Here are some errors: "); ConsoleWrite(pwr[-1] + " " + pwr[17]); ConsoleWriteLine(); } }

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The output from the program is shown here:

First 8 powers of 2: 1 2 4 8 16 32 64 128 Here are some errors: -1 -1

30 20 10 2 _ 10 _ 20 _ 30 4 6

Notice that the indexer for PwrOfTwo includes a get accessor, but no set accessor As explained, this means that the indexer is read-only Thus, a PwrOfTwo object can be used on the right side of an assignment statement, but not on the left For example, attempting to add this statement to the preceding program won t work:

This statement will cause a compilation error because no set accessor is defined for the indexer There are two important restrictions to using indexers First, because an indexer does not define a storage location, a value produced by an indexer cannot be passed as a ref or out parameter to a method Second, an indexer must be an instance member of its class; it cannot be declared static

// Declare a keypress event class class KeyEvent { public event EventHandler <KeyEventArgs> KeyPress; // This is called when a key is pressed public void OnKeyPress(char key) { KeyEventArgs k = new KeyEventArgs(); if(KeyPress != null) { kch = key; KeyPress(this, k); } } } // Demonstrate KeyEvent class KeyEventDemo { static void Main() { KeyEvent kevt = new KeyEvent(); ConsoleKeyInfo key; int count = 0; // Use a lambda expression to display the keypress kevtKeyPress += (sender, e) => ConsoleWriteLine(" Received keystroke: " + ech); // Use a lambda expression to count keypresses kevtKeyPress += (sender, e) => count++; // count is an outer variable ConsoleWriteLine("Enter some characters " + "Enter a period to stop"); do { key = ConsoleReadKey(); kevtOnKeyPress(keyKeyChar); } while(keyKeyChar != ''); ConsoleWriteLine(count + " keys pressed"); } }

Here is a sample run:

15 10 _4 _6 _5 _10 _15 _2 5 2 4 6 _6 _4 _2

Enter some characters Enter a period to stop t Received keystroke: t e Received keystroke: e s Received keystroke: s t Received keystroke: t Received keystroke: 5 keys pressed

15:

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The program begins by deriving a class from EventArgs called KeyEventArgs, which is used to pass a keystroke to an event handler Next, a delegate called KeyHandler defines the event handler for keystroke events The class KeyEvent encapsulates the keypress event It defines the event KeyPress In Main( ), a KeyEvent object called kevt is created Next, an event handler based on a lambda expression is added to kvetKeyPress that displays each key as it is entered, as shown here:

15 10 5 4 2 _5 _10 _15 6

kevtKeyPress += (sender, e) => ConsoleWriteLine(" Received keystroke: " + ech);