一个线程知识点, 一个MongoDB的知识点

       
//WINForm窗体中切换前后台线程执行任务:
        protected void RunOnUI(Action action)
        {
            Invoke(action);
        }

        protected void RunOnBg(Action action)
        {
            Task.Factory.StartNew(action);
        }

            //MongoDB创建索引
            if (idx.Count == 1)
            {
                tbPoints.Indexes.CreateOne(Builders<GpsPoint>.IndexKeys.Descending(it => it.Sn));
                tms = Convert.ToInt32((DateTime.Now - dtStart).TotalSeconds);
                LogHelper.Show($"压缩轨迹 ~~ 创建索引 用时 {tms} 秒");
            }