C# AutoCAD2010选择dwg中的一个块，获取其位置后，再选择一个外部块，在该位置去替换它，完整代码

好的，以下是完整代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;

namespace ReplaceBlock
{
    public class Commands
    {
        [CommandMethod("RB")]
        public void ReplaceBlock()
        {
            Document doc = Application.DocumentManager.MdiActiveDocument;
            Editor ed = doc.Editor;

            // 选择第一个块
            PromptEntityOptions peo1 = new PromptEntityOptions("\n选择第一个块: ");
            peo1.SetRejectMessage("\n必须选择块对象.");
            peo1.AddAllowedClass(typeof(BlockReference), true);
            PromptEntityResult per1 = ed.GetEntity(peo1);
            if (per1.Status != PromptStatus.OK)
            {
                ed.WriteMessage("\n无效的选择.");
                return;
            }

            // 获取第一个块的位置
            Transaction tr1 = doc.TransactionManager.StartTransaction();
            using (tr1)
            {
                BlockReference br1 = tr1.GetObject(per1.ObjectId, OpenMode.ForRead) as BlockReference;
                if (br1 != null)
                {
                    Point3d pt1 = br1.Position;

                    // 选择第二个块
                    PromptEntityOptions peo2 = new PromptEntityOptions("\n选择第二个块: ");
                    peo2.SetRejectMessage("\n必须选择块对象.");
                    peo2.AddAllowedClass(typeof(BlockReference), true);
                    PromptEntityResult per2 = ed.GetEntity(peo2);
                    if (per2.Status != PromptStatus.OK)
                    {
                        ed.WriteMessage("\n无效的选择.");
                        return;
                    }

                    // 获取第二个块的属性
                    BlockReference br2 = tr1.GetObject(per2.ObjectId, OpenMode.ForRead) as BlockReference;
                    if (br2 != null)
                    {
                        BlockTableRecord btr = (BlockTableRecord)tr1.GetObject(br1.BlockTableRecord, OpenMode.ForWrite);
                        BlockTableRecord btr2 = (BlockTableRecord)tr1.GetObject(br2.BlockTableRecord, OpenMode.ForWrite);

                        // 创建新的块参照并插入到块表记录中
                        BlockReference newBr = new BlockReference(pt1, btr.ObjectId);
                        btr.AppendEntity(newBr);
                        tr1.AddNewlyCreatedDBObject(newBr, true);

                        // 复制第二个块的属性到新的块参照中
                        newBr.CopyFrom(br2);

                        // 删除第二个块参照
                        br2.Erase();
                    }
                }
                tr1.Commit();
            }
        }
    }
}

请注意，此代码仅适用于 AutoCAD 2010 并使用 C# 语言。使用时请将其编译为 .dll 文件并加载到 AutoCAD 中。在命令行中输入“RB”即可执行命令。