C#实现控制线程池最大数并发线程

　<b> WCF后台服务代码

private static ILog log = new LogHelper("SeqService"); // 日志
private static Dictionary<int, DateTime> dic_thread = new Dictionary<int, DateTime>(); // 线程列表
 
private static long Num = 0; // 线程个数
private static object lock_Num = 0; // 共享数据-锁
 
/// <summary>
/// 在线申请流水号
/// </summary>
/// <returns></returns>
[WebGet(UriTemplate = "GetSeqNum/Json", ResponseFormat = WebMessageFormat.Json)]
public string GetSeqNumber()
{ 
  lock (lock_Num)
  {
    Num++;
    int id_thread = System.Threading.Thread.CurrentThread.ManagedThreadId;
    DateTime now = DateTime.Now;
    if (!dic_thread.TryGetValue(id_thread, out now))
    {
      dic_thread.Add(id_thread, DateTime.Now);
    }
 
  }
  string ret = DateTime.Now.ToString("yyyyMMdd") + Num.ToString(new string('0', 9)); 
 
  log.Info(string.Format("{0}, Thread={1}/{2}", ret, System.Threading.Thread.CurrentThread.ManagedThreadId, dic_thread.Count));
  return ret;
}