Proj4Net is a C#/.Net library to transform point coordinates from one geographic coordinate system to another, including datum transformation.
The core of this library is a port of the Proj4J library.
- .Net Framework 3.5
- Silverlight v4.0
- WindowsPhone 7
Home of Proj4J
Proj4J can be found here: http://trac.osgeo.org/proj4j
Still to do
- Implement remaining Projections
- Port and expand Proj4J test suite
- Tests, tests, tests ... find the bugs
- Check CoordianteReferenceSystem resource files (epsg/esri/nad/world) for actuality (with proj4)
Proj4Net is neither the only open source projection library for .Net available nor the one with the most active community. You may want to take a look at