批量合并文件夹下大量cad图纸，使用插件一键完成，效果如下：

（使用方法：命令行输入 “netload” 加载插件，然后输入“combdwg”运行，选择文件夹即可。）

部分代码如下：

 public void CombineDWG()//多次事务
 {
     DateTime beforDT = System.DateTime.Now;
     Database currentdb = HostApplicationServices.WorkingDatabase;
     FolderBrowserDialog dialog = new FolderBrowserDialog();
     dialog.Description = "请选择待合并dwg所在文件夹：";  // 设置对话框的标题
     DialogResult dlgResult = dialog.ShowDialog();
     if (dlgResult == DialogResult.OK)
     {
         int counter = 0;
         string pathName = dialog.SelectedPath;
         string[] fileNames = Directory.GetFiles(pathName, "*.dwg", SearchOption.AllDirectories);//此行代码为只合并dwg
         foreach (string fileName in fileNames)
         {
             try
             {
                 using (Transaction tr = currentdb.TransactionManager.StartTransaction())
                 {//当前数据库开启事务

                     using (Database tempdb = new Database(false, true)) //创建临时数据库(两个参数：是否创建符号表，不与当前文档关联)
                     {
                        ////省略部分代码
                        ///
                     }
                     counter = counter + 1;
                     tr.Commit();
                 }
             }
             catch (System.Exception)
             {
                 Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage($"\n出现错误......\n");
             }
             Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage($"\n正在合并第{counter}个......\n");
             //Application.DocumentManager.MdiActiveDocument.Editor.Regen();//刷新屏幕
             System.Windows.Forms.Application.DoEvents();
         }
         Application.DocumentManager.MdiActiveDocument.SendStringToExecute("._zoom _e ", true, false, false);
         DateTime afterDT = System.DateTime.Now;
         string totaltime = afterDT.Subtract(beforDT).TotalSeconds.ToString("F3", CultureInfo.InvariantCulture);
         currentdb.SaveAs(pathName + @"\" + $"总{DateTime.Now.ToString("yyyyMMdd_HHmmss")}.dwg", DwgVersion.Current);
        
     }
 }

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