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The program begins by creating a class called ChrPair that will hold the results of the query It then creates two character arrays, called chrs and chrs2 It uses the following query to produce all possible combinations of the two sequences:
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var pairs = from ch1 in chrs from ch2 in chrs2 select new ChrPair(ch1, ch2);
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The nested from clauses cause both chrs and chrs2 to be iterated over Here is how it works First, a character is obtained from chrs and stored in ch1 Then, the chrs2 array is enumerated With each iteration of the inner from, a character from chrs2 is stored in ch2 and the select clause is executed The result of the select clause is a new object of type ChrPair that contains the character pair ch1, ch2 produced by each iteration of the inner from Thus, a ChrPair is produced in which each possible combination of characters is obtained Another common use of a nested from is to iterate over a data source that is contained within another data source An example of this is found in the section, Use let to Create a Variable in a Query, later in this chapter
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One of the most powerful query features is provided by the group clause because it enables you to create results that are grouped by keys Using the sequence obtained from a group, you can easily access all of the data associated with a key This makes group an easy and effective way to retrieve data that is organized into sequences of related items The group clause is one of only two clauses that can end a query (The other is select) The group clause has the following general form: group range-variable by key It returns data grouped into sequences, with each sequence sharing the key specified by key The result of group is a sequence that contains elements of type IGrouping<TKey, TElement>, which is declared in the SystemLinq namespace It defines a collection of objects that share a common key The type of query variable in a query that returns a group is IEnumerable<IGrouping<TKey, TElement>> IGrouping defines a read-only property called Key, which returns the key associated with each sequence Here is an example that illustrates the use of group It declares an array that contains a list of websites It then creates a query that groups the list by top-level domain name, such as org or com
// Demonstrate the group clause using System; using SystemLinq; class GroupDemo { static void Main() {
Part I:
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string[] websites = { "hsNameAcom", "hsNameBnet", "hsNameCnet", "hsNameDcom", "hsNameEorg", "hsNameForg", "hsNameGtv", "hsNameHnet", "hsNameItv" }; // Create a query that groups websites by top-level domain name var webAddrs = from addr in websites where addrLastIndexOf('') != -1 group addr by addrSubstring(addrLastIndexOf('')); // Execute the query and display the results foreach(var sites in webAddrs) { ConsoleWriteLine("Web sites grouped by " + sitesKey); foreach(var site in sites) ConsoleWriteLine(" " + site); ConsoleWriteLine(); } } }
The output is shown here:
Web sites grouped by com hsNameAcom hsNameDcom Web sites grouped by net hsNameBnet hsNameCnet hsNameHnet Web sites grouped by org hsNameEorg hsNameForg Web sites grouped by tv hsNameGtv hsNameItv
As the output shows, the data is grouped based on the top-level domain name of a website Notice how this is achieved by the group clause:
var webAddrs = from addr in websites where addrLastIndexOf('') != -1 group addr by addrSubstring(addrLastIndexOf(''));
The key is obtained by use of the LastIndexOf( ) and Substring( ) methods defined by string (These are described in 7 The version of Substring( ) used here returns the substring that starts at the specified index and runs to the end of the invoking string) The index of the last period in a website name is found using LastIndexOf( ) Using this index, the Substring( ) method obtains the remainder of the string, which is the part of the website name that contains the top-level domain name One other point: Notice the use of the where clause to filter out any strings that don t contain a period The LastIndexOf( ) method returns 1 if the specified string is not contained in the invoking string
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