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Framework包含两个集HashSet&lt

来源:http://www.hhmtch.com 作者:澳门新葡萄京 时间:2019-05-18 04:50

  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);
    }

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