I got it. I was confused before. Because I found you purchased and installed the winform and wpf edition.
Yes. Mapsuite 12 do support .Net core and .Net freamwork.
If you are using latest mapsuite desktop or wpf edition. You can find how do I sample here
https://gitlab.com/thinkgeo/public/thinkgeo-desktop-maps. You may need update the NuGet library to the latest one.
Then you could use mapView.GetSnapshot(); to do a snapshot after all layer rendered.
If you only use ThinkGeo.Core no UI involved. Here is some smaple code
GeoImage bitmap = new GeoImage(1024, 1024);
InMemoryFeatureLayer layer = new InMemoryFeatureLayer();
// TODO add some shape to your InMemoryFeatureLayer
layer.ZoomLevelSet.ZoomLevel01.DefaultLineStyle = LineStyle.CreateSimpleLineStyle(GeoColor.FromArgb(255, 169, 195, 221), 2F, GeoColors.Black, 4F, false);
layer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
RectangleShape extent = layer.GetBoundingBox(); // You may need get extent base on your image size and the zoomlevel, center point.
GeoCanvas canvas = GeoCanvas.CreateDefaultGeoCanvas();
canvas.BeginDrawing(bitmap, extent, GeographyUnit.Meter);
layer.Draw(canvas, new Collection<SimpleCandidate>());
if you have multiple layers need draw. You could use the sample cavas. Just keep drawing.