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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

Can you hear the sense of urgency that s implied In each example, the terminology is natural The sentence ows It sounds right That s good writing EXERCISE 9: Add Urgency Through Time-Sensitive Vocabulary Rewrite the E-mail lead (the first phrase or sentence) below to integrate a time-sensitive word or phrase

// Demonstrate the group clause using System; using SystemLinq; class GroupDemo { static void Main() {

Part I:

j =1

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

f ( xj )

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

According to Max and Jonathan, the ABC Company has accepted our proposal pending clari cation of a few issues This is great news, and we want to be sure to address their concerns pronto! Let s go over the speci cs at 9 am tomorrow Con rm with Cathy that you ll be there Jan

19:

As a result, the Riemann sum for the partition P is R( f, P) = 4 j2 2 k2 k j =1 8 j2 k3 j =1 8 k3

Because the sequence obtained when webAddrs is executed is a list of groups, you will need to use two foreach loops to access the members of each group The outer loop obtains each group The inner loop enumerates the members within the group The iteration variable of the outer foreach loop must be an IGrouping instance compatible with the key and element type In the example both the keys and elements are string Therefore, the type of the sites iteration variable of the outer loop is IGrouping<string, string> The type of the iteration variable of the inner loop is string For brevity, the example implicitly declares these variables, but they could have been explicitly declared as shown here:

foreach(IGrouping<string, string> sites in webAddrs) { ConsoleWriteLine("Web sites grouped by " + sitesKey); foreach(string site in sites) ConsoleWriteLine(" " + site); ConsoleWriteLine(); }