polygon implementation in csharp. this is my first program for upload.

这是一个在GIS系统编程中经常用到的最短路径分析的代码，由于这个功能经常用，所以在这上传了，方便大家以后编程用。-This is a GIS system programming in the shortest path is often used in the analysis of the code, since this feature is often used, so in this upload, easy to use programming after all.