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如下图所示，红线为分割后的线（已挪动）：

 部分代码如下：

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using AcTools;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Colors;
using System.Runtime.CompilerServices;
using Wform = System.Windows.Forms;
using System.IO;
using System.Windows.Forms;
//using Excel = NetOffice.ExcelApi;namespace AcTools
{public class Class1{#region //Polyline pl = new Polyline(3);//pl.AddVertexAt(0, new Point2d(10, 2), 0, 0, 0); // 起点 //pl.AddVertexAt(1, new Point2d(30, 5), 0, 0, 0); // 起点 //pl.AddVertexAt(2, new Point2d(50, 25), 0, 0, 0); // 起点 //Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;//db.AddEntityToModeSpace(line);#endregion[CommandMethod("xx")]public void XX(){   var db = Z.db;Point3dCollection pcoll = new Point3dCollection();List<Entity> ents =db.SelectEntities<Entity>();if (ents.Count<1){Z.ed.WriteMessage("重新选择"); }for (global::System.Int32 i = 0; i < ents.Count; i++){for (global::System.Int32 j = i+1; j < ents.Count; j++){ents[i].IntersectWith(ents[j], Intersect.OnBothOperands, pcoll, IntPtr.Zero, IntPtr.Zero); }}if (pcoll.Count ==0){return; }//foreach (Point3d item in pcoll)//{//    db.AddCircleModeSpace(item, 2);//}foreach (Curve item1 in ents){ try{DBObjectCollection dBoc= item1.GetSplitCurves(pcoll);foreach (Entity entsp in dBoc){db.AddEntityToModeSpace(entsp);entsp.ChangeEntityColor(1);}}catch (System.Exception){Z.ed.WriteMessage("无\n");}//db.Erase(item1);    }}