CAD.net二次开发--找到与制定点最近的2个实体

public static class Class2
    {
        public static ObjectId[] fun(Point3d point)
        {
            Database db = HostApplicationServices.WorkingDatabase;
            Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
            Point3dCollection points = new Point3dCollection();
            List<string> wenben = new List<string>();
            List<double> distance = new List<double>();
            ObjectId[] s = new ObjectId[2];
            ObjectIdCollection textids = new ObjectIdCollection();
            TypedValue[] values = new TypedValue[]
            {
                new TypedValue((int)DxfCode.LayerName,"TK"),
                new TypedValue((int)DxfCode.Start,"TEXT")
            };
            SelectionFilter selfilter = new SelectionFilter(values);
            PromptSelectionResult psr = ed.SelectAll(selfilter);
            if (psr.Status == PromptStatus.OK)
            {
                SelectionSet ss = psr.Value;
                using (Transaction trans = db.TransactionManager.StartTransaction())
                {
                    foreach (ObjectId id in ss.GetObjectIds())
                    {
                        DBText mytext = trans.GetObject(id, OpenMode.ForRead) as DBText;
                        if (mytext != null)
                        {
                            points.Add(mytext.Position);
                            wenben.Add(mytext.TextString);
                            // mytext.TextString = "";
                            textids.Add(id);
                            distance.Add(point.DistanceTo(mytext.Position));
                        }
                    }
                    trans.Commit();
                }
            }
            else { ed.WriteMessage("错误"); return s; }
            ////冒泡
            double temp = 0; string wenbentemp = "";
            ObjectId tempid = new ObjectId();
            for (int i = distance.Count; i > 0; i--)
            {

                for (int j = 0; j < i - 1; j++)
                {

                    if (distance[j] > distance[j + 1])
                    {

                        temp = distance[j]; wenbentemp = wenben[j]; tempid = textids[j];

                        distance[j] = distance[j + 1]; wenben[j] = wenben[j + 1]; textids[j] = textids[j + 1];

                        distance[j + 1] = temp; wenben[j + 1] = wenbentemp; textids[j + 1] = tempid;

                    }

                }

            }
            /////冒泡结束
            s[0] = textids[0];
            s[1] = textids[1];
            return s;
        }
    }

学习点：找到与制定点最近的2个实体的ID；冒泡排序，选择集；以及基本的CAD二次开发过程