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Sets in C#

A collection that contains only distinct items is known by the term set..NET 4 includes two sets, HashSet<T>and SortedSet<T>, that both implement the interface ISet<T>. HashSet<T>contains an unordered

list of distinct items; with SortedSet<T>the list is ordered. The ISet<T>interface offers methods to create a union of multiple sets, an intersection of sets, or give information if one set is a super- or subset of another.

With the sample code, three new sets of type string are created and filled with Formula-1 cars. The HashSet<T>class implements the ICollection<T>interface. However, the Add() method is implemented

explicitly and a different Add() method is offered by the class as you can see here. The Add() method differsby the return type; a Boolean value is returned to give the information if the element was added. If the elementwas already in the set, it is not added, and false is returned:

var companyTeams = new HashSet<string>()

{ "Ferrari", "McLaren", "Toyota", "BMW", "Renault" };

var traditionalTeams = new HashSet<string>()

{ "Ferrari", "McLaren" };

var privateTeams = new HashSet<string>()

{ "Red Bull", "Toro Rosso", "Force India", "Brawn GP" };

if (privateTeams.Add("Williams"))

Console.WriteLine("Williams added");

if (!companyTeams.Add("McLaren"))

Console.WriteLine("McLaren was already in this set");

The result of these two Add() methods is written to the console:

Williams added

McLaren was already in this set

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