Select graphically TinVolumeSurface, not TinSurface

[joantopo]

 PromptEntityOptions entOpts2 = new PromptEntityOptions("\nSelect Volume Surface (only TIN): ");

            var _with2 = entOpts2;
            _with2.SetRejectMessage("\nObject invalid.");

       _with2.AddAllowedClass(typeof(Autodesk.Civil.DatabaseServices.TinVolumeSurface), true);
        
            _with2.AllowNone = true;
            _with2.AllowObjectOnLockedLayer = true;
            PromptEntityResult entRes2 = ed.GetEntity(entOpts2);
            if (entRes2.Status != PromptStatus.OK)
                return;

 I have problems because I allow only TinSurfaceVolume to select but Civil 3D allow me TinSurface too.

Why?

[joantopo]

Well, I do this with transaction :

 ObjectId IdsuperficieVolumen = entRes2.ObjectId;
           

            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                CivDb.Surface SupSelect = (CivDb.Surface)IdsuperficieVolumen.GetObject(OpenMode.ForRead);
                if (SupSelect.IsVolumeSurface == false)
                {
                    MessageBox.Show("La superfície seleccionada no es una superfície de Volumen.\nComando finalizado.", "AVISO", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    ed.WriteMessage("\n");
                    return;

                }

But, can I do it without transaction during the prompt?

Thanks.

[Jeff_M · Accepted solution]

Nope, can't do it without the Transaction. (Well, you could just use Open/Close directly without a Transaction.) Even though the API differentiates between a TinSurface and a TinVolumeSurface, the underlying objects both have the same DXF name "AECC_TIN_SURFACE".

[joantopo]

Yes, you´re right.

Moreover, I don´t like why Civil 3D differenciates some properties for TinVolumeSurface and GridVolumeSurface for VolumeSurfaceProperties.

I have to create an instance for TinVolumeSurface and another for GridVolumeSurface to get volume. I have to repeat the same code for each case.