如何从HashSet <T>中检索实际项目？

HashSet<T> set = new HashSet<T>();
foreach (T item in set)
{
    Console.WriteLine(item);
}

using System.Linq;

HashSet<T> set = new HashSet<T>();
var query = from item in set
            select item;

foreach (T item in query)
{
    Console.WriteLine(item);
}

HashSet<T> set = new HashSet<T>();
T[] array = set.ToArray();

foreach (T item in array)
{
    Console.WriteLine(item);
}

HashSet<T> set = new HashSet<T>();
List<T> list = set.ToList();

foreach (T item in list)
{
    Console.WriteLine(item);
}