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The C# Language
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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(" } }
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" + s);
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The output is shown here:
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The e-mail addresses are Herb@HerbSchildtcom Tom@HerbSchildtcom Sara@HerbSchildtcom
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Pay special attention to the select clause:
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select entryAddress;
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Instead of returning the entire range variable, it returns only the Address portion This fact is evidenced by the output This means 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
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// 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; }
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19:
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LINQ
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; Address = a; } } class SelectDemo3 { static void Main() { ContactInfo[] contacts = { new ContactInfo("Herb", "Herb@HerbSchildtcom", "555-1010"), new ContactInfo("Tom", "Tom@HerbSchildtcom", "555-1101"), new ContactInfo("Sara", "Sara@HerbSchildtcom", "555-0110") }; // Create a query that creates a list of EmailAddress objects var emailList = from entry in contacts select new EmailAddress(entryName, entryEmail); ConsoleWriteLine("The e-mail list is"); // Execute the query and display the results foreach(EmailAddress e in emailList) ConsoleWriteLine(" {0}: {1}", eName, eAddress ); } }
PART I
The output is shown here:
The e-mail list is Herb: Herb@HerbSchildtcom Tom: Tom@HerbSchildtcom Sara: Sara@HerbSchildtcom
In the query, pay special attention to the select clause:
select new EmailAddress(entryName, entryEmail);
It creates a new EmailAddress object that contains the name and e-mail address obtained from a ContactInfo object in the contacts array The key point is that new EmailAddress objects are created by the query in its select clause, during the query s execution
Part I:
The C# Language
Use Nested from Clauses
A query can contain more than one from clause Thus, a query can contain nested from clauses One common use of a nested from clause is found when a query needs to obtain data from two different sources Here is a simple example It uses two from clauses to iterate over two different character arrays It produces a sequence that contains all possible combinations of the two sets of characters
// Use two from clauses to create a list of all // possible combinations of the letters A, B, and C // with the letters X, Y, and Z using System; using SystemLinq;
// This class class ChrPair public char public char
holds the result of the query { First; Second;
public ChrPair(char c, char c2) { First = c; Second = c2; } } class MultipleFroms { static void Main() { char[] chrs = { 'A', 'B', 'C' }; char[] chrs2 = { 'X', 'Y', 'Z' }; // Notice that the first from iterates over chrs and // the second from iterates over chrs2 var pairs = from ch1 in chrs from ch2 in chrs2 select new ChrPair(ch1, ch2); ConsoleWriteLine("All combinations of ABC with XYZ: "); foreach(var p in pairs) ConsoleWriteLine("{0} {1}", pFirst, pSecond); } }
The output is shown here:
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