GDAL is a C++ translator library for more than 200 raster and vector geospatial data formats. It offers an API for a variety of languages such as C, C++, Python, Perl, C# and Java.
vdPConsulting has investigated whether and how this GDAL/OGR functionality can be implemented in a C# plugin in AutoCAD.
In vdPCADdesign, it is now possible to export CADdesign-objects to GML, GeoJSON, GeoPackage and ESRI Shape files. For reading from the same files, CADdesign-objects are expected to write them as objects in the drawing.
Also in vdPClassify it is now possible to export Classify-objects to GML, GeoJSON, GeoPackage and ESRI Shape files. For reading in from the same files, generic functions have been implemented in the vdPClassify-toolkit that read in the points, lines and polygons and create them as generic AutoCAD Points, Polylines and Closed Polylines in the drawing.
Ask the cadgis-consultant.