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The select clause determines what type of elements are obtained by a query Its general form is shown here: select expression So far we have been using select to return the range variable Thus, expression has simply named the range variable However, select is not limited to this simple action It can return a specific portion of the range variable, the result of applying some operation or transformation to the range variable, or even a new type of object that is constructed from pieces of the information retrieved from the range variable This is called projecting To begin examining the other capabilities of select, consider the following program It displays the square roots of the positive values contained in an array of double values

// Use select to return the square root of all positive values // in an array of doubles using System; using SystemLinq; class SelectDemo { static void Main() {

x + f (x2 )

19:

The rst several words or phrases of your communication are called the lead or lead-in If the lead doesn t catch your readers attention, it s unlikely they ll read on Why would they To have your objectives met, you need to have your material read

{ -100, 164, 12125, 10085, -22, 2525, -35 } ;

// Create a query that returns the square roots of the // positive values in nums var sqrRoots = from n in nums where n > 0 select MathSqrt(n); ConsoleWriteLine("The square roots of the positive values" + " rounded to two decimal places:"); // Execute the query and display the results foreach(double r in sqrRoots) ConsoleWriteLine("{0:###}", r); } }

x + + f (xk )

The output is shown here:

The square roots of the positive values rounded to two decimal places: 405 348 1004 502

In the query, pay special attention to the select clause:

select MathSqrt(n);

Here the symbol k denotes the sum of the expression to its right for each j=1 of the instances j = 1 to j = k The reasoning just presented suggests that the true area A is given by lim R( f, P)

It returns the square root of the range variable It does this by obtaining the result of passing the range variable to MathSqrt( ), which returns the square root of its argument This means that the sequence obtained when the query is executed will contain the square roots of the positive values in nums If you generalize this concept, the power of select becomes apparent You can use select to generate any type of sequence you need, based on the values obtained from the data source Here is a program that shows another way to use select It creates a class called EmailAddress that contains two properties The first holds a person s name The second contains an e-mail address The program then creates an array that contains several EmailAddress entries The program uses a query to obtain a list of just the e-mail addresses by themselves

// Return a portion of the range variable using System; using SystemLinq; class EmailAddress { public string Name { get; set; } public string Address { get; set; } public EmailAddress(string n, string a) { Name = n; Address = a; } }

No matter how high you score on the Empathy Index, no matter how strong your reader focus, try to adhere to the Rule of First Reference, which says that your rst reference should be to your readers, not yourself It s not always possible to do, but if you can, it s a good idea Compare these two leads:

Part I:

y = f (x)

class SelectDemo2 { static void Main() { EmailAddress[] addrs = { new EmailAddress("Herb", "Herb@HerbSchildtcom"), new EmailAddress("Tom", "Tom@HerbSchildtcom"), new EmailAddress("Sara", "Sara@HerbSchildtcom") }; // Create a query that selects e-mail addresses var eAddrs = from entry in addrs select entryAddress; ConsoleWriteLine("The e-mail addresses are"); // Execute the query and display the results foreach(string s in eAddrs) ConsoleWriteLine(" } }

" + s);

The output is shown here:

Pay special attention to the select clause:

y = f (x)

select entryAddress;