Ogr加载文件

          //注册驱动
           Ogr.RegisterAll();
           //打开文件
           DataSource datashp = Ogr.Open(@"D:\Mydata\quanshi.shp", 1);
           
           //若打开失败则告知
           if (datashp == null)
           {
               Console.WriteLine("Read file failed");
           }

           //Mapinfo Tab数据读取

           //获取数据中的图层
           Layer datalayer = datashp.GetLayerByName("quanshi");
           
           //获取图层中的要素
           Feature feature;
           //获取图层定义
           FeatureDefn featureDefn = datalayer.GetLayerDefn();
           //获取要素的几何对象
           Geometry geometry;
           //属性字段计数
           int iFiled;

           //归位
           datalayer.ResetReading();

           //逐一读取要素
           while ((feature = datalayer.GetNextFeature())!=null)
           {
               //不能读取FID和Shape这两个默认属性
               for (iFiled = 0; iFiled < featureDefn.GetFieldCount(); iFiled++)
               {
                   FieldDefn fieldDefn = featureDefn.GetFieldDefn(iFiled);
                   string fieldName = fieldDefn.GetName();
               }

               geometry = feature.GetGeometryRef();