用c#开发的基础gis库源代码，在gis开源业内名气很大，请大家享用！-with the development of the gis the source code, industry revenue in gis great reputation, please enjoy!

Assembly language has a pretty bad reputation. The common impression about assembly language programmers today is that they are all hackers or misguided individuals who need enlightenment. Here are the reasons people give for not using assembly

虚基类：声名一个基类vehicle, 有私有成员MaxSpeed和Weight，公有成员run()和stop(),以及构造和析构函数。 从vehicle派生bicycle和motorcar, bicycle有私有成员height， motorcar有私有成员seatnum,以及各自的构造函数和析构函数。-Virtual base class: The reputation of a base class vehicle, a private member MaxSpeed ​ &#