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C#集合之集(set)

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包含不重复元素的集合称为“集(set)”。.NET Framework包含两个集HashSet<T>和SortedSet<T>,它们都实现ISet<T>接口。HashSet<T>集包含不重复元素的无序列表,SortedSet<T>集包含不重复元素的有序列表。
ISet<T>接口提供的方法可以创建合集,交集,或者给出一个是另一个集的超集或子集的信息。

    var companyTeams = new HashSet<string>() { "Ferrari", "McLaren", "Mercedes" };
    var traditionalTeams = new HashSet<string>() { "Ferrari", "McLaren" };
    var privateTeams = new HashSet<string>() { "Red Bull", "Lotus", "Toro Rosso", "Force India", "Sauber" };

    if (privateTeams.Add("Williams"))
      Console.WriteLine("Williams added");
    if (!companyTeams.Add("McLaren"))
      Console.WriteLine("McLaren was already in this set");

IsSubsetOf验证traditionalTeams中的每个元素是否都包含在companyTeams中

    if (traditionalTeams.IsSubsetOf(companyTeams))
    {
      Console.WriteLine("traditionalTeams is subset of companyTeams");
    }

IsSupersetOf验证traditionalTeams中是否有companyTeams中没有的元素

    if (companyTeams.IsSupersetOf(traditionalTeams))
    {
      Console.WriteLine("companyTeams is a superset of traditionalTeams");
    }

Overlaps验证是否有交集

    traditionalTeams.Add("Williams");
    if (privateTeams.Overlaps(traditionalTeams))
    {
      Console.WriteLine("At least one team is the same with the traditional " +
      "and private teams");
    }

调用UnionWith方法把新的 SortedSet<string>变量填充为companyTeams,privateTeams,traditionalTeams的合集

    var allTeams = new SortedSet<string>(companyTeams);
    allTeams.UnionWith(privateTeams);
    allTeams.UnionWith(traditionalTeams);

    Console.WriteLine();
    Console.WriteLine("all teams");
    foreach (var team in allTeams)
    {
      Console.WriteLine(team);
    }

输出(有序的):

      Ferrari
      Force India
      Lotus
      McLaren
      Mercedes
      Red Bull
      Sauber
      Toro Rosso
      Williams

每个元素只列出一次,因为集只包含唯一值。
ExceptWith方法从ExceptWith中删除所有私有元素

    allTeams.ExceptWith(privateTeams);
    Console.WriteLine();
    Console.WriteLine("no private team left");
    foreach (var team in allTeams)
    {
      Console.WriteLine(team);
    }

到此这篇关于C#集合之集(set)的文章就介绍到这了。希望对大家的学习有所帮助,也希望大家多多支持。

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