下面示例使用ObjectIdCollection对象来跟踪应该复制的对象。一旦对象ids被添加进集合，集合就会进行迭代，新的对象会被Clone函数进行创建，然后添加进模型空间。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
namespace SingleCopy
{
public class DYCopy
{
[CommandMethod("SingleCopy")]
public static void SCopy()
{
//获取当前文件和数据库
Document acDoc = Application.DocumentManager.MdiActiveDocument;
Database acCurDb = acDoc.Database;
//开始事务管理
using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
{
//以读的方式打开块表
BlockTable acBlkTbl;
acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, OpenMode.ForRead) as BlockTable;
//打开块表记录模型空间，用于写
BlockTableRecord acBlkTblRec;
acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord;
//创建圆心为（2，3），半径为4.25的圆
Circle acCirc = new Circle();
acCirc.SetDatabaseDefaults();
acCirc.Center = new Point3d(2, 3, 0);
acCirc.Radius = 4.25;
//添加新对象到块表记录和事务
acBlkTblRec.AppendEntity(acCirc);
acTrans.AddNewlyCreatedDBObject(acCirc, true);
//创建圆的副本，并改变它的半径
Circle acCircClone = acCirc.Clone() as Circle;
acCircClone.Radius = 1;
//添加圆的副本
acBlkTblRec.AppendEntity(acCircClone);
acTrans.AddNewlyCreatedDBObject(acCircClone, true);
//将新对象保存到数据库中
acTrans.Commit();
}
}
[CommandMethod("MultipleCopy")]
public static void MultipleCopy()
{
//获取当前文件和数据库
Document acDoc = Application.DocumentManager.MdiActiveDocument;
Database acCurDb = acDoc.Database;
//开始事务管理
using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
{
//打开块表用于读
BlockTable acBlkTbl;
acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, OpenMode.ForRead) as BlockTable;
//打开块表记录的模型空间，用于写
BlockTableRecord acBlkTblRec;
acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord;
//创建圆，以（0,0,0）为圆心，以5为半径
Circle acCircl = new Circle();
acCircl.SetDatabaseDefaults();
acCircl.Center = new Point3d(0, 0, 0);
acCircl.Radius = 5;
//添加新对象到块表记录和事务中
acBlkTblRec.AppendEntity(acCircl);
acTrans.AddNewlyCreatedDBObject(acCircl, true);
//创建圆，以（0，0，0）为圆心，以7为半径
Circle acCirc2 = new Circle();
acCirc2.SetDatabaseDefaults();
acCirc2.Center = new Point3d(0, 0, 0);
acCirc2.Radius = 7;
//添加新对象到块表记录和事务中
acBlkTblRec.AppendEntity(acCirc2);
acTrans.AddNewlyCreatedDBObject(acCirc2, true);
//添加所有要克隆的对象
DBObjectCollection acDbobjColl = new DBObjectCollection();
acDbobjColl.Add(acCircl);
acDbobjColl.Add(acCirc2);
foreach (Entity acEnt in acDbobjColl)
{
Entity acEntClone;
acEntClone = acEnt.Clone() as Entity;
acEntClone.ColorIndex = 1;
//创建一个矩阵，移动每个副本实体15个单位；
acEntClone.TransformBy(Matrix3d.Displacement(new Vector3d(15, 0, 0)));
//添加副本对象
acBlkTblRec.AppendEntity(acEntClone);
acTrans.AddNewlyCreatedDBObject(acEntClone, true);
}
//将对象保存进数据库
acTrans.Commit();
}
}
}
}