using Acap = Autodesk.AutoCAD.ApplicationServices.Application; 
    public class Command_test

    {

        [CommandMethod("tt", CommandFlags.Modal | CommandFlags.UsePickSet | CommandFlags.Redraw)]

        public static void tt()

        {

            Database db = HostApplicationServices.WorkingDatabase;//当前的数据库

            Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;

            int aa = ;

            for (int i = ; i < ; i++)

            {

                using (Transaction tr = db.TransactionManager.StartTransaction())

                {

                    //新建圆

                    var ent = EntityAdd.AddCircleToEntity(new Point3d(aa++, , ), 0.5);

                    EntityAdd.AddEntityToMsPs(tr, db, ent);

                    //刷新内容

                    Acap.UpdateScreen();

                    tr.Commit();

                }

                ed.WriteMessage(aa++.ToString()+"\n");//这两种不同感觉

                //ed.WriteMessage(aa++.ToString()+"\r");//这两种不同感觉

                //高版本要加这句令命令栏立即执行

                System.Windows.Forms.Application.DoEvents();

                //阻塞

                System.Threading.Thread.Sleep();

            }

        }

    }