Hi. I met some problem when I trying to do the Region.BooleanOperation. I wrote a command to prompt user to select multiple regions, and I join (union) them into a region. below is my code for doing this :
using AutoCadExtension.ExtensionMethod;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using AcadApplication = Autodesk.AutoCAD.ApplicationServices.Application;
using AcadRegion = Autodesk.AutoCAD.DatabaseServices.Region;
using System;
using System.Linq;
[CommandMethod("JoinRegions")]
public void JoinRegions()
{
try
{
var doc = AcadApplication.DocumentManager.MdiActiveDocument;
var editor = doc.Editor;
var db = doc.Database;
var pso = new PromptSelectionOptions()
{
MessageForAdding = "select regions",
MessageForRemoval = "unselect regions"
};
var psr = editor.GetSelection(pso);
if (psr.Status != PromptStatus.OK) return;
using (var tr = doc.TransactionManager.StartTransaction())
{
var selectedObjIds = psr.Value.GetObjectIds().Where(objId => objId.ObjectClass.DxfName == "REGION");
var selectedRegions = selectedObjIds.Select(objId => objId.GetObject(OpenMode.ForWrite) as AcadRegion).ToList();
AcadRegion region = selectedRegions[0];
for (int i = 1; i < selectedRegions.Count; i++)
{
region.BooleanOperation(BooleanOperationType.BoolUnite, selectedRegions[i]); //->eGeneralModelingFailure
}
tr.Commit();
}
}
catch (System.Exception ex)
{
AcadApplication.ShowAlertDialog("Unhandled Exception:\n" + ex.Message);
return;
}
}
but in some cases, the BooleanOperation() method would throw an eGeneralModelingFailure exception. if I move some region a bit. the operation can be succeed again. there's no more information/message thrown. just can't figure out what's the reason of this exception. can anyone give some tips? thanks!
the attached file is the region I tested. I know there might be many possible reasons. so this file may help reproduce my problem. thanks for any help!
