此代码实现的是在c#环境下基于MapXtrem的轨迹回放功能。运行后显示车辆在地图上的轨迹。由于代码中有连接的数据库，应根据自己需要对连接语句进行修改-This code is based on playback MapXtrem trajectory in c# environment. Show on the map the trajectory of the vehicle after the operation. Since the code has connected database, according to their statements need to be modified to connect