cad.net 句柄遍历数据库

        /// <summary>
        /// 句柄遍历数据库
        /// http://www.theswamp.org/index.php?topic=39272.0
        /// https://through-the-interface.typepad.com/through_the_interface/2013/06/dgn-clean-up-tool-on-its-way.html
        /// </summary>
        [CommandMethod("FastIteration", CommandFlags.Modal)]
        public void FastIteration()
        {
            Document doc = Acap.DocumentManager.MdiActiveDocument;
            Database db = doc.Database;
            Editor ed = doc.Editor;

            DateTime start = DateTime.Now;

            long linshi = 0;
            long amount = 0;
            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                try
                {
                    for (amount = db.BlockTableId.Handle.Value; amount < db.Handseed.Value; amount++)
                    {
                        //ObjectId id = ObjectId.Null;
                        //Below slow code is commented:
                        //try {
                        //    id = TargetDb.GetObjectId(false, new Handle(i), 0);
                        //}
                        //catch {
                        //    ++exceptCount;
                        //    continue;
                        //} 

                        TimeSpan len = DateTime.Now - start;
                        if (len.Seconds != linshi && len.Seconds % 1 == 0)//满足一秒输出一次,免得卡死
                        {
                            linshi = len.Seconds;
                            ed.WriteMessage($"\n\r数量: {amount},已经过了{len.Days}天,{len.Hours}小时,{len.Minutes}分,{len.Seconds}秒");

                            //刷新内容
                            Acap.UpdateScreen();
                            //高版本要加这句令命令栏立即执行
                            System.Windows.Forms.Application.DoEvents();
                        }
                    }
                }
                catch (System.Exception e)
                {
                    TimeSpan len = DateTime.Now - start;
                    ed.WriteMessage($"\n\r错误:{amount}+{e.Message}" + $"\n\r数量: {amount},已经过了{len.Days}天,{len.Hours}小时,{len.Minutes}分,{len.Seconds}秒");
                }
            }
        }