.net pdf 417

.net pdf 417

.net pdf 417

.net pdf 417

.net pdf 417

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// Create and use some extension methods using System; using SystemGlobalization; static class MyExtMeths { // Return the reciprocal of a double public static double Reciprocal(this double v) { return 10 / v; } // Reverse the case of letters within a string and // return the result public static string RevCase(this string str) { string temp = ""; foreach(char ch in str) { if(CharIsLower(ch)) temp += CharToUpper(ch, CultureInfoCurrentCulture); else temp += CharToLower(ch, CultureInfoCurrentCulture); } return temp; } // Return the absolute value of n / d public static double AbsDivideBy(this double n, double d) { return MathAbs(n / d); } } class ExtDemo { static void Main() { double val = 80; string str = "Alpha Beta Gamma"; // Call the Reciprocal() extension method ConsoleWriteLine("Reciprocal of {0} is {1}", val, valReciprocal()); // Call the RevCase() extension method ConsoleWriteLine(str + " after reversing case is " + strRevCase()); // Use AbsDivideBy(); ConsoleWriteLine("Result of valAbsDivideBy(-2): " + valAbsDivideBy(-2)); } }

Part I:

The output is shown here:

We set the two equations equal and solve to find that the curves intersect at x = 1 and x = 2 The situation is shown in Figure 420 Notice that y = ( x 1) 2 + 3 is the upper curve and y = x 2 2 is the lower curve Thus the desired area is

Reciprocal of 8 is 0125 Alpha Beta Gamma after reversing case is aLPHA bETA gAMMA Result of valAbsDivideBy(-2): 4

In the program, notice that each extension method is contained in a static class called MyExtMeths As explained, an extension method must be declared within a static class Furthermore, this class must be in scope in order for the extension methods that it contains to be used (This is why you needed to include the SystemLinq namespace to use the LINQrelated extension methods) Next, notice the calls to the extension methods They are invoked on an object, in just the same way that an instance method is called The main difference is that the invoking object is passed to the first parameter of the extension method Therefore, when the expression

valAbsDivideBy(-2)

For example, Maureen, benefits manager in the human resources department of a paper manufacturer, wrote an article for her company s employee newsletter about mutual fund options newly available in the 401(k) retirement plan We were scared that the oodgates would open and we d be overwhelmed with calls, she explained So I ended the article by saying: For further information about the new options, to review your account, or to E-mail questions to a bene ts manager, please click on the 401(k) icon on our intranet s home page Tim, a lawyer in an energy distributorship, wanted his staff to review legal ndings before their upcoming meeting I sent an E-mail telling them that I wanted them to read several cases before we met I gave them two that I expected them to read, and ended with Consult Marianna for additional case suggestions I was interested in tracking who consulted Marianna and who didn t In a proposal we sent out, Malcolm, vice president of a construction company, explains, for our engineering design services, we ended each section with source information For instance, in the nancial section, the last sentence was All data provided by the US Department of the Interior Please consult their website for details Very matter-of-fact, which was exactly the tone we wanted Ginny, owner of a restaurant supply company, sent out letters to all her customers announcing a price increase I explained it in the body of the letter, and ended with Attached is an updated price listing for your binder Please replace the current page with this one Short and sweet Challenge Your Readers with a Question Ending with a question involves readers by inviting them to think I wanted to challenge people to come up with ideas, Max says Creative director of an internal advertising department in the textile industry, Max ended a staff E-mail looking for new promotional ideas with T-shirts and baseball caps Tote bags and pens We need a fresh approach Any ideas He explained, Ending with a question helps people focus Sarah, a freelance writer, wanted to win approval for an article idea She ended her E-mailed inquiry to an editor with Any interest As she explains, That s the bottom line It s to the point, and that s what editors like.

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