New Post: Using the Gdal extension from a script in F#

I found the solution here : https://dotspatial.codeplex.com/discussions/586346 . Had to create a GdalRasterProvider first and use its Open method

let gdal= new DotSpatial.Data.Rasters.GdalExtension.GdalRasterProvider()
let myraster = gdal.Open(@"D:\temp\SH-21-X-A.tif");
map.Layers.Add(myraster)
map.Refresh()