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C# 30: A Beginner s Guide
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A Closer Look at select
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The select clause determines what types of elements are obtained by a query Its general form is shown here:
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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 obtained 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
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// 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() { double[] nums = { -100, 164, 12125, 10085, -22, 2525, -35 } ;
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// Create a query that returns the square roots of the // positive values in nums var sqrRoots = from n in nums where n > 0 Return a sequence that contains select MathSqrt(n); the square roots of 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); } }
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The output is shown here:
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The square roots of the positive values rounded to two decimal places: 405 348 1004 502
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14: Introducing LINQ
In the program, pay special attention to the select clause:
select MathSqrt(n);
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; } } 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 Use just the Address portion select entryAddress; of the elements in addrs ConsoleWriteLine("The e-mail addresses are"); // Execute the query and display the results foreach(string s in eAddrs) ConsoleWriteLine(" } }
" + s);
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The output is shown here:
The e-mail addresses are Herb@HerbSchildtcom Tom@HerbSchildtcom Sara@HerbSchildtcom
Pay special attention to the select clause:
select entryAddress;
Instead of returning the entire range variable, it returns only the Address portion This fact is evidenced by the output This means that the query returns a sequence of strings, not a sequence of EmailAddress objects This is why the foreach loop specifies s as a string As explained, the type of sequence returned by a query is determined by the type of value returned by the select clause One of the more powerful features of select is its ability to return a sequence that contains elements created during the execution of the query For example, consider the following program It defines a class called ContactInfo, which stores a name, e-mail address, and telephone number It also defines the EmailAddress class used by the preceding example Inside Main( ), an array of ContactInfo is created Then, a query is declared in which the data source is an array of ContactInfo, but the sequence returned contains EmailAddress objects Thus, the type of the sequence returned by select is not ContactInfo, but rather EmailAddress, and these objects are created during the execution of the query
// Use a query to obtain a sequence of EmailAddresses // from a list of ContactInfo using System; using SystemLinq; class ContactInfo { public string Name { get; set; } public string Email { get; set; } public string Phone { get; set; } public ContactInfo(string n, string a, string p) { Name = n; Email = a; Phone = p; } } class EmailAddress { public string Name { get; set; } public string Address { get; set; } public EmailAddress(string n, string a) { Name = n;
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