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// 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:

(1427)

WHERE SHCUSTOMERSCUST_LAST_NAME In (SELECT View__1Column__1 FROM ( SELECT SHCUSTOMERSCUST_LAST_NAME AS Column__1, RANK() OVER( ORDER BY sum(SHSALESAMOUNT_SOLD) DESC FROM SHCUSTOMERS, SHSALES WHERE ( SHCUSTOMERSCUST_ID=SHSALESCUST_ID ) GROUP BY SHCUSTOMERSCUST_LAST_NAME ) View__1 WHERE View__1Rk__1 <= 10 ) )

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:

) AS Rk__1

The velocity of point P as a point on either body is equal to radius r multiplied by the angular velocity dq/dt of the respective body u p = pi Solving, dq 0 ri = dq i r0 (1428) dq i dq = r0 0 dt dt

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:

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

So far in this chapter you added many meaningful breaks, sorts, and calculations With multidimensional analysis, you look at the same data but from different viewpoints The viewpoints may be from different dimensions by drilling across or different levels of detail by drilling down A dimension is a kind of object by which you analyze numeric measures Dimensions often have different levels or groupings associated with them called hierarchies Multidimensional analysis is the process of analyzing data by different dimensions and levels within the dimensions Within Web Intelligence, you can perform multidimensional analysis only with Dimension objects, not with objects the designer has created as Detail objects (see 9) Hierarchies allow you to analyze data by different levels of detail Some hierarchies are very clear-cut, such as Time, going from Year to Quarter to Month to Week to Day There is a natural order Geography hierarchies may also be predetermined, running from Continent to Country to State When the geography applies to a marketing region, however, each company introduces its own variation One company may group the Middle East and Africa together; another company may include Mexico as part of North America because it is part of NAFTA or will group it under a different management region such as Latin America Many of these groupings are predetermined as part of your company s reference data and built into the ERP or data warehouse The universe designer uses the hierarchies to build the default drill paths you use for multidimensional analysis

Solving Eqs (1427) and (1428) simultaneously and knowing that ce = ri + r0 gives radii r0 = ce ce = in dq 0 1 + f (q i ) 1+ dq i ce (1429)

Next, another lambda expression based handler is added to kvetKeyPress by the following code It counts the number of keypresses

Notice that count is a local variable declared in Main( ) that is initialized to zero Next, a loop is started that calls kevtOnKeyPress( ) when a key is pressed This causes the registered event handlers to be notified When the loop ends, the number of keypresses is displayed Although quite simple, this example illustrates the essence of event handling The same basic approach will be used for other event handling situations Of course, in some cases, anonymous event handlers will not be appropriate and named methods will need to be employed

Part III:

(1430)

his chapter discusses three C# features that give you greater control over the organization and accessibility of a program These are namespaces, the preprocessor, and assemblies