topic Re: Argument 2: cannot convert from 'void' in .NET Forum

Argument 2: cannot convert from 'void'

dinhthit25 — Wed, 04 Dec 2024 03:36:23 GMT

i stuck at this problem Argument 2: cannot convert from 'void' to 'Autodesk.AutoCAD.Colors.Color'
does anyone know how to fix this or give me an advise how to fix this
im using C#.net framework 4.8

private void ApplyColorsTo3DObject() { Document doc = Application.DocumentManager.MdiActiveDocument; Database db = doc.Database; Editor ed = doc.Editor; if (_color1 == null || _color2 == null) { ed.WriteMessage("\nPlease choose two colors."); return; } using (var docLock = doc.LockDocument()) { PromptEntityOptions peo = new PromptEntityOptions("\nSelect a 3D solid:"); peo.SetRejectMessage("\nOnly 3D solids are allowed."); peo.AddAllowedClass(typeof(Solid3d), true); var per = ed.GetEntity(peo); if (per.Status != PromptStatus.OK) { ed.WriteMessage("\nNo valid 3D solid selected."); return; } using (Transaction tr = db.TransactionManager.StartTransaction()) { Solid3d solid3d = tr.GetObject(per.ObjectId, OpenMode.ForWrite) as Solid3d; if (solid3d == null) { ed.WriteMessage("\nSelected object is not a valid Solid3d."); return; } try { // Tạo FullSubentityPath để truy cập BREP var fullSubentityPath = new FullSubentityPath(new[] { per.ObjectId }, new SubentityId(SubentityType.Null, IntPtr.Zero)); using (var brep = new Brep(fullSubentityPath)) { int faceIndex = 0; foreach (Autodesk.AutoCAD.BoundaryRepresentation.Face face in brep.Faces) { try { // Lấy SubentityId của mặt var subEntityId = face.SubentityPath.SubentId; // Chọn màu xen kẽ dựa trên chỉ số mặt var colorToApply = (faceIndex % 2 == 0) ? _color1 : _color2; solid3d.SetSubentityColor(subEntityId, ApplyColorToFace(solid3d, face, colorToApply)); faceIndex++; } catch (System.Exception ex) { ed.WriteMessage($"\nError applying color to face: {ex.Message}"); } } } } catch (System.Exception ex) { ed.WriteMessage($"\nError processing solid: {ex.Message}"); } tr.Commit(); } } } private void ApplyColorToFace(Solid3d solid, Autodesk.AutoCAD.BoundaryRepresentation.Face face, Autodesk.AutoCAD.Colors.Color color) { try { var subentityId = face.SubentityPath.SubentId; solid.SetSubentityColor(subentityId, color); } catch (System.Exception ex) { Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage($"\nError applying color: {ex.Message}"); } }

Re: Argument 2: cannot convert from 'void'

ActivistInvestor — Wed, 04 Dec 2024 04:09:16 GMT

@dinhthit25 wrote:
i stuck at this problem Argument 2: cannot convert from 'void' to 'Autodesk.AutoCAD.Colors.Color'
does anyone know how to fix this or give me an advise how to fix this
im using C#.net framework 4.8

solid3d.SetSubentityColor(subEntityId, ApplyColorToFace(solid3d, face, colorToApply));

Your code is calling SetSubEntityColor() and passing it an argument that is the result of a method that returns void.

Re: Argument 2: cannot convert from 'void'

dinhthit25 — Wed, 04 Dec 2024 04:16:10 GMT

thanks you point it out for me

Re: Argument 2: cannot convert from 'void'

cuongtk2 — Wed, 04 Dec 2024 04:26:53 GMT

I don't understand why you use the ApplyColorToFace function when you could simply add one more parameter for the color in solid3d.SetSubentityColor(subEntityId, colorToApply).

Re: Argument 2: cannot convert from 'void'

dinhthit25 — Wed, 04 Dec 2024 04:29:09 GMT

may i ask do you know how to fix that line

solid3d.SetSubentityColor(subEntityId, ApplyColorToFace(solid3d, face, colorToApply));

i try changes

ApplyColorToFace

and it wont paint the color anymore

Re: Argument 2: cannot convert from 'void'

dinhthit25 — Wed, 04 Dec 2024 04:37:45 GMT

now you mention it, ApplyColorToFace not necessary