简易排序方法如下: 

  public static  void XX(){var circles = Z.db.SelectEntities<Circle>();circles = circles.OrderByDescending(x => x.Center.Y).ThenBy(x => x.Center.X).ToList();for (int i = 0; i < circles.Count; i++){DBText text = new DBText() { Position = circles[i].Center, TextString = i.ToString(),Height = 1,ColorIndex= 1 };Z.db.AddEntityToModeSpace(text);}//Debugger.Break();}

 public static List<T> SelectEntities<T>(this Database db ) where T : Entity{List<T> result = new List<T>();Editor editor = Application.DocumentManager.MdiActiveDocument.Editor;var pso = new PromptSelectionOptions();pso.MessageForAdding = "\n请选择：";PromptSelectionResult psr = editor.GetSelection(pso);if (psr.Status == PromptStatus.OK){ObjectId[] objectids = psr.Value.GetObjectIds();Database database = HostApplicationServices.WorkingDatabase;using (Transaction tran = database.TransactionManager.StartTransaction()){foreach (var item in objectids){Entity entity = item.GetObject(OpenMode.ForRead) as Entity;if (entity is T){result.Add(entity as T);}}}}return result;}

 public static ObjectId AddEntityToModeSpace(this Database db, Entity ent){// 声明ObjectId 用于返回ObjectId entId = ObjectId.Null;// 开启事务处理using (Transaction trans = db.TransactionManager.StartTransaction()){// 打开块表BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead);// 打开块表记录BlockTableRecord btr = (BlockTableRecord)trans.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);// 添加图形到块表记录entId = btr.AppendEntity(ent);// 更新数据信息trans.AddNewlyCreatedDBObject(ent, true);// 提交事务trans.Commit();}return entId;}

调整后的效果：

   public static  void XX(){int k = 0;var circles = Z.db.SelectEntities<Circle>();List < List < Circle >> bigteam = Z.GroupEntities<Circle>(circles,Z.IsHorizontalOverlap);bigteam = bigteam.OrderByDescending(x => x[0].Center.Y).ToList();for (int i = 0; i < bigteam.Count; i++){bigteam[i] = bigteam[i].OrderBy(x => x.Center.X).ToList();for ( int j = 0; j < bigteam[i].Count; j++){k = k + 1;DBText text = new DBText() { Position = bigteam[i][j].Center, TextString = k.ToString(), Height = 0.8, ColorIndex = 1 };Z.db.AddEntityToModeSpace(text);}}}

  public static List<List<T>> GroupEntities<T>(List<T> entities,Func<Entity,Entity,bool>func)where T : Entity{List<List<T>> result = new List<List<T>>();List<Friend> friends = new List<Friend>();for (int i = 0; i < entities.Count; i++){Friend friend = new Friend(i);friends.Add(friend);}for (int i = 0; i < entities.Count - 1; i++){for (int j = 0; j < entities.Count; j++){if (func(entities[i], entities[j])){friends[i].Friends.Add(friends[j]);friends[j].Friends.Add(friends[i]);}}}while (friends.Count > 0){List<T> list = new List<T>();Queue<Friend> queue = new Queue<Friend>();queue.Enqueue(friends[0]);friends.RemoveAt(0);*****result.Add(list);}return result;}

之字形排序：

 public static  void XX(){int k = 0;var circles = Z.db.SelectEntities<Circle>();List < List < Circle >> bigteam = Z.GroupEntities<Circle>(circles,Z.IsHorizontalOverlap);bigteam = bigteam.OrderByDescending(x => x[0].Center.Y).ToList();for (int i = 0; i < bigteam.Count; i++){if (i % 2 != 0){bigteam[i] = bigteam[i].OrderByDescending(x => x.Center.X).ToList();for (int j = 0; j < bigteam[i].Count; j++){k = k + 1;DBText text = new DBText() { Position = bigteam[i][j].Center, TextString = k.ToString(), Height = 0.8, ColorIndex = 1 };Z.db.AddEntityToModeSpace(text);}}else{bigteam[i] = bigteam[i].OrderBy(x => x.Center.X).ToList();for ( int j = 0; j < bigteam[i].Count; j++){k = k + 1;DBText text = new DBText() { Position = bigteam[i][j].Center, TextString = k.ToString(), Height = 0.8, ColorIndex = 1 };Z.db.AddEntityToModeSpace(text);}}}}

 while (queue.Count > 0){Friend friend = queue.Dequeue();list.Add(entities[friend.Id]);foreach (Friend f in friend.Friends){if (friends.Contains(f)){queue.Enqueue(f);friends.Remove(f);}}}

规定组数分组法，区别与横向碰撞分组，一刀切分组。

[CommandMethod("CirsOrderBy")]
public void CirsOrderBy()
{double fenShu = 5;List<Circle> cirs = new List<Circle>();Editor ed = Tool.GetEditor();PromptSelectionOptions selectionOptions = new PromptSelectionOptions();SelectionFilter sf = new SelectionFilter(new TypedValue[] { new TypedValue((int)DxfCode.Start,"Circle")});PromptSelectionResult psr = ed.SelectAll(sf);if (psr == null) return;using (Transaction tr = Tool.GetCurDatabse().TransactionManager.StartTransaction()){ObjectId[] ids=psr.Value.GetObjectIds();for (int i = 0; i < ids.Length; i++) {Circle cir= tr.GetObject(ids[i],OpenMode.ForRead)as Circle;cirs.Add(cir);}tr.Commit();}cirs=cirs.OrderBy(c => c.Center.Y).ToList();double totalHeight=cirs.Last().Center.Y-cirs.First().Center.Y;double quJian = totalHeight / fenShu;int quJianShu =(int)Math.Ceiling(totalHeight / fenShu);List<List<Circle>>cirGroups= new List<List<Circle>>();List<Circle>cirGroup= new List<Circle>();for (int i = 0; i < quJianShu; i++) {cirGroup=cirs.Where(c=>c.Center.Y>=cirs.First().Center.Y+i*quJian&& c.Center.Y < cirs.First().Center.Y + (i+1) * quJian).ToList();if (i % 2 == 0){cirGroup = cirGroup.OrderBy(c => c.Center.X).ToList();}else{cirGroup = cirGroup.OrderByDescending(c => c.Center.X).ToList();}cirGroups.Add(cirGroup);}cirs.Clear();foreach (var item in cirGroups){foreach (var circle in item){ cirs.Add(circle);}}Database db = Tool.GetCurDatabse();using (Transaction tr = db.TransactionManager.StartTransaction()){BlockTable bt=tr.GetObject(db.BlockTableId,OpenMode.ForRead)as BlockTable;BlockTableRecord btr = tr.GetObject(bt[BlockTableRecord.ModelSpace],OpenMode.ForWrite) as BlockTableRecord;for (int i = 0; i < cirs.Count; i++) {DBText txt= new DBText();txt.Position = cirs[i].Center;txt.VerticalMode = TextVerticalMode.TextVerticalMid;txt.HorizontalMode = TextHorizontalMode.TextMid;txt.AlignmentPoint = cirs[i].Center;txt.TextString=(i+1).ToString();txt.Height = 50;txt.ColorIndex = 2;btr.AppendEntity(txt);tr.AddNewlyCreatedDBObject(txt, true);}tr.Commit();}
}