C# 0 The Complete Reference

PART I

C h a p t e r   1 9 :  

L I N Q  

563

PART IPART I

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

. 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 sites in webAddrs) {

  Console.WriteLine("Web sites grouped by " + sites.Key);

  foreach(string site in sites)

    Console.WriteLine("  " + site);

  Console.WriteLine();

}