一个线程知识点, 一个MongoDB的知识点

 1        
 2 //WINForm窗体中切换前后台线程执行任务:
 3         protected void RunOnUI(Action action)
 4         {
 5             Invoke(action);
 6         }
 7 
 8         protected void RunOnBg(Action action)
 9         {
10             Task.Factory.StartNew(action);
11         }
12 
13             //MongoDB创建索引
14             if (idx.Count == 1)
15             {
16                 tbPoints.Indexes.CreateOne(Builders<GpsPoint>.IndexKeys.Descending(it => it.Sn));
17                 tms = Convert.ToInt32((DateTime.Now - dtStart).TotalSeconds);
18                 LogHelper.Show($"压缩轨迹 ~~ 创建索引 用时 {tms} 秒");
19             }