.NET Framework 中的并发 HashSetT

csharp
using System;
using System.Collections.Concurrent;
class Program
{
    static void MAIn(string[] args)
    {
        // 创建一个并发 HashSet<int> 对象
        ConcurrentHashSet<int> set = new ConcurrentHashSet<int>();
        // 在多个线程中同时添加元素
        Parallel.For(0, 100000, i =>
        {
            set.Add(i);
        });
        // 检查集合中是否包含某个元素
        bool contAIns = set.ContAIns(9999);
        Console.WriteLine("Set contAIns 9999: " + contAIns);
        // 删除集合中的元素
        set.Remove(9999);
        // 检查集合中是否包含某个元素
        contAIns = set.ContAIns(9999);
        Console.WriteLine("Set contAIns 9999: " + contAIns);
        Console.ReadLine();
    }
}
// 并发 HashSet<T> 的简单实现
class ConcurrentHashSet<T>
{
    private readonly ConcurrentDictionary<T, byte> dictionary;
    public ConcurrentHashSet()
    {
        dictionary = new ConcurrentDictionary<T, byte>();
    }
    public void Add(T item)
    {
        dictionary.TryAdd(item, 0);
    }
    public void Remove(T item)
    {
        byte value;
        dictionary.TryRemove(item, out value);
    }
    public bool ContAIns(T item)
    {
        return dictionary.ContAInsKey(item);
    }
}