C# AutoCAD.SendstringToExciute尝试编辑未选择选定对象

双击后尝试从命令行运行ATTEDIT，并让它选择以前选择的项目。我截获了双击事件，可以运行ATTEDIT，但当我尝试将位置传递到“ATTEDIT选择块”时，它什么也不做。但是，当我再次单击块时，它将起作用。我想这只是因为我有十进制单位，而不是建筑单位。但这并不管用。以下是我所拥有的：

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

public class DoubleClickProcess
{
// This function gets called when a block reference is double clicked on. It then checks to see if the block reference
// that was double clicked on was double clicked
[CommandMethod("DOUBLECLICK", CommandFlags.UsePickSet)]
public void ContinueDoubleClick()
{
  Document doc = Application.DocumentManager.MdiActiveDocument;
  Database database = HostApplicationServices.WorkingDatabase;
  Editor ed = doc.Editor;

  // Get the PickFirst selection set
  PromptSelectionResult acSSPrompt;
  acSSPrompt = ed.SelectImplied();

  SelectionSet selRes;

  // If the prompt status is OK, objects were selected before
  // the command was started
  if (acSSPrompt.Status == PromptStatus.OK)
  {
    selRes = acSSPrompt.Value;

    Transaction tr = doc.TransactionManager.StartTransaction();
    using (tr)
    {
      // Go through all of the objects that were selected...
      ObjectId[] objIds = selRes.GetObjectIds();
      foreach (ObjectId objId in objIds)
      {
        Entity theEnt = (Entity)tr.GetObject(objId, OpenMode.ForRead);

        // They must be block references...
        if (theEnt.GetType().Name.ToUpper() == "BLOCKREFERENCE")
        {
          BlockReference bRef = theEnt as BlockReference;

          BlockTableRecord btr = null;
          btr = tr.GetObject(bRef.DynamicBlockTableRecord, OpenMode.ForRead) as BlockTableRecord;

          if (bRef != null)
          {
            // If it is a specific block then we are interested in it
            if (btr.Name.ToString().ToUpper() == "specific")
            {
              doc.SendStringToExecute("SomeCommand ", true, false, true);
            }
            else
            {
              // It's not one we're interested in so do what double clicking would normally do
              String objPx = Autodesk.AutoCAD.Runtime.Converter.DistanceToString(bRef.Position.X);
              objPx = objPx.Replace(" ", "-");
              String objPy = Autodesk.AutoCAD.Runtime.Converter.DistanceToString(bRef.Position.Y);
              objPy = objPy.Replace(" ", "-");
              String objP =   objPx +","+ objPy;
              doc.SendStringToExecute("ATTEDIT "+ objP + " ", true, false, true);
            }
          }
        }
        theEnt.Dispose();
      }
      tr.Commit();
    }
  }

  // Clear the PickFirst selection set
  ObjectId[] idarrayEmpty = new ObjectId[0];
  ed.SetImpliedSelection(idarrayEmpty);
  }
 }
}

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键入鼠标的架构位置（101'-6-7/8“，89'-5-1/2”），但如果键入块的实际位置，它不会选择块属性。

我认为它应该与SetImpliedSelection一起工作：

SelectionSet selset = SelectionSet.FromObjectIds(new ObjectId[] { bRef.ObjectId });
ed.SetImpliedSelection(selset);
doc.SendStringToExecute("ATTEDIT ", true, false, true);

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似乎不起作用。selset值显示为：{（（（8796087858048），不可用，0，）}，但我认为它应该类似：{（（8796087858048），PickPoint，1，）}。你知道怎么把检查站和1放进去吗？还有其他建议吗？