多线程操作（ThreadPool.QueueUserWorkItem

主线程：

         private void GetPolicy_Load(object sender, EventArgs e)
         {
             ////ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadSP));
             try
             {
                 MessageBox.Show("开始");
                 ManualResetEvent[] _ManualEvents = new ManualResetEvent[];
                 _ManualEvents[] = new ManualResetEvent(false);
                 _ManualEvents[] = new ManualResetEvent(false);
                 ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadSP2), _ManualEvents[]); 

                 foreach (var v in _ManualEvents)
                 {
                     v.WaitOne();
                 }
                 // 线程结束后执行后面的主线程代码
                 MessageBox.Show("结束了");
             }
             catch (Exception ex)
             {

             }
         }

ThreadSP2方法：

 //
        private void ThreadSP2(object obj)
        {

            ////处理方法
            //string sql = "select id,start,end from tb";
            //DataTable dt = SqlHelper.ExecuteDataset("连接字符串", System.Data.CommandType.Text, sql, null).Tables[0];
            //List<string> list;
            //for (int i = 0; i < dt.Rows.Count; i++)
            //{
            //    list = new List<string>();
            //    list.Add(dt.Rows[i]["start"] + ";" + dt.Rows[i]["end"] + ";" + dt.Rows[i]["id"]);
            //    GJShopping2 s1 = new GJShopping2();
            //    ThreadPool.QueueUserWorkItem(new WaitCallback(s1.GetShopping), list);
            //    Thread.Sleep(1500);
            //}
            MessageBox.Show("ThreadSP2 方法执行了");
            ManualResetEvent e = (ManualResetEvent)obj;
            e.Set();
        }

========线程队列控制并发

private Dictionary<List<string>, Thread> _ThreadDictionary = new Dictionary<List<string>, Thread>();   //存储采集任务线程
private int _MaxThreadCount = 20;  //最大允许多少并发线程进行采集数据
DataTable dt = SqlHelper.ExecuteDataset("连接字符串", System.Data.CommandType.Text, sql, null).Tables[0];
                        List<string> list;
                        for (int i = 0; i < dt.Rows.Count; i++)
                        {
                            list = new List<string>();
                            list.Add(dt.Rows[i]["fromcity"] + ";" + dt.Rows[i]["tocity"] + ";" + dt.Rows[i]["policysettingid"]);
                            SPHandler hd = new SPHandler();
                            _ThreadDictionary.Add(list, new Thread(new ParameterizedThreadStart(hd.GetShopping), 5));
                            //hd.GetShopping 带参数方法（处理数据）
                            //ThreadPool.QueueUserWorkItem(new WaitCallback(hd.GetShopping), list);
                            //Thread.Sleep(1000 * 2 * 1);
                        }
                        #region 线程队列处理
                        if (_ThreadDictionary.Count > 0)
                        {
                            int maxThreadSize = _MaxThreadCount;                //最大并发线程数量
                            int totalThreadCount = _ThreadDictionary.Count;     //总线程数量

                            while (totalThreadCount > 0)
                            {
                                int worksThreadSize = _ThreadDictionary.Where(k => k.Value.IsAlive).Count();    //当前活动线程数量

                                if (worksThreadSize < maxThreadSize)
                                {
                                    foreach (KeyValuePair<List<string>, Thread> item in _ThreadDictionary.Where(k => k.Value.ThreadState.Equals(ThreadState.Unstarted)))
                                    {
                                        item.Value.Start(item.Key);
                                        worksThreadSize++;
                                        totalThreadCount--;
                                        //达到最大活跃线程数量则跳出 Foreach 循环 , 重新执行 while 中代码.
                                        if (worksThreadSize == maxThreadSize)
                                            break;
                                    }
                                }
                            }
                            //等待所有线程操作完成
                            while (_ThreadDictionary.Where(k => k.Value.IsAlive).Count() > 0) { }
                        }
                        #endregion

　==== GetShopping（带参数方法，处理数据）

 public void GetShopping(object obj)
        {
            List<string> listtable = obj as List<string>;
            DateTime dtstart = DateTime.Now.AddDays(1);
            DateTime dtend = Convert.ToDateTime(dtstart.AddMonths(1).ToString("yyyy-MM") + "-01");
            dtend = dtend.AddDays(-1);

            //暂时跑T+3,T+33时间段数据测试
            dtstart = DateTime.Now.AddDays(3);
            dtend = dtstart.AddDays(30);
            List<string> listids = new List<string>();
            List<string> listidstemp = new List<string>();
            string[] array;
            for (int i = 0; i < listtable.Count; i++)
            {
                array = listtable[i].Split(';');
                //遍历起止日期
                for (DateTime dt = dtstart; dt <= dtend; dt = dt.AddDays(1))
                {
                    EWin.International.PolicyForm.SPService.AirFareFlightShopRequest req = new EWin.International.PolicyForm.SPService.AirFareFlightShopRequest();
                    req.UName = SP_UID;
                    req.UPassword = SP_PWD;
                    req.StartCity = array[0];
                    req.EndCity = array[1];
                    req.SearchDateDt = dt;
                    if (SaveToDB(req))
                    {
                        listids.Add(array[2]);
                    }
                    else
                    {
                        listidstemp.Add(array[2]);
                    }
                }
            }
            listidstemp = listidstemp.Distinct().ToList();
            if (listidstemp.Count > 0)
            {
                BllPolicysetting.UpdateState(listidstemp, "N", listidstemp.Count, Config.CONSQL_WRITE_ETWIN_INTERNATIONAL_DB);
                listidstemp.Clear();
            }
            listids = listids.Distinct().ToList();
            if (listids.Count > 0)
            {
                BllPolicysetting.UpdateState(listids, "N", 0, Config.CONSQL_WRITE_ETWIN_INTERNATIONAL_DB);
                listids.Clear();
            }
        }