C# AutoCAD2010 dwg选择块，在该块位置上选择外部块替换，其他位置上的同名块不变完整代码

以下是C# AutoCAD2010 dwg选择块，在该块位置上选择外部块替换，其他位置上的同名块不变的完整代码：

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;
using System.Collections.Generic;

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

            // 选择要替换的块
            PromptEntityOptions peo = new PromptEntityOptions("\n选择要替换的块: ");
            peo.SetRejectMessage("\n只能选择块！");
            peo.AddAllowedClass(typeof(BlockReference), true);
            PromptEntityResult per = ed.GetEntity(peo);
            if (per.Status != PromptStatus.OK) return;
            ObjectId blockId = per.ObjectId;

            // 获取要替换的块的位置
            using (Transaction tr = doc.TransactionManager.StartTransaction())
            {
                BlockReference block = tr.GetObject(blockId, OpenMode.ForRead) as BlockReference;
                if (block == null) return;
                Point3d blockPosition = block.Position;

                // 选择替换的块
                PromptResult pr = ed.GetString("\n输入要替换的块的名称: ");
                if (pr.Status != PromptStatus.OK) return;
                string blockName = pr.StringResult;

                // 替换块
                BlockTable bt = tr.GetObject(doc.Database.BlockTableId, OpenMode.ForRead) as BlockTable;
                if (bt == null) return;
                if (!bt.Has(blockName)) return;
                ObjectId newBlockId = bt[blockName];
                BlockReference newBlock = new BlockReference(blockPosition, newBlockId);
                BlockTableRecord btr = tr.GetObject(doc.Database.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;
                if (btr == null) return;
                btr.AppendEntity(newBlock);
                tr.AddNewlyCreatedDBObject(newBlock, true);

                // 处理其他同名块
                List<BlockReference> blocks = new List<BlockReference>();
                BlockTableRecord ms = tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForRead) as BlockTableRecord;
                if (ms == null) return;
                foreach (ObjectId id in ms)
                {
                    BlockReference b = tr.GetObject(id, OpenMode.ForRead) as BlockReference;
                    if (b != null && b.Name.ToLower() == block.Name.ToLower() && b.Position != block.Position)
                    {
                        blocks.Add(b);
                    }
                }
                foreach (BlockReference b in blocks)
                {
                    BlockReference newB = new BlockReference(b.Position, newBlockId);
                    ms.UpgradeOpen();
                    b.UpgradeOpen();
                    b.Erase();
                    ms.AppendEntity(newB);
                    tr.AddNewlyCreatedDBObject(newB, true);
                }

                tr.Commit();
            }

            ed.WriteMessage($"\n已成功将块 {block.Name} 替换为 {blockName}！");
        }
    }
}

首先，用户需要选择要替换的块。然后，程序会提示用户输入要替换的块的名称。接着，程序会在数据库中查找该名称的块，并将其替换到用户选择的块的位置。最后，程序会找出其他同名块，并将它们也替换为新的块。