for (int i = 0; i < 10; i++)
            {
                bool b = false;
                Thread t = new Thread(delegate()
                {
                    while (true)
                    {
                        try
                        {
                            A++;
                           
                           string S = GetNo();
                            string ISS = "";
                                ISS=SS.Find(X => X == S);
                            SS.Add(S);
                            if (!string.IsNullOrWhiteSpace(ISS))
                            {
                                Console.WriteLine(S+"有重复"+"-------------"+A);
                                b = true;
                                Console.Read();
                            }
                            else
                            {
                                Console.WriteLine(S+"没有重复" + "----------" + A);
                            }
                        }
                        catch (Exception ex)
                        {
                            Console.WriteLine(ex.Message);
                        }
                    }
                });
                t.IsBackground = true;
                t.Start();






  public static string GetNo()
        {
              Object thisLock = new Object();
              lock (thisLock)
                {
                    //随机数
                    System.Random random = new System.Random();
                    return System.DateTime.Now.ToString("yyyyMMddHHmmss") + random.Next(1000, 10000).ToString();
                 }
        }