Cad c#.net 一键修改标注dimension中的文本内容

 本例为给标注加前缀，也可定制其他形式，效果如下：

  public class Demo
  {
      [CommandMethod("xx")]//
      public void Dim()
      {
          Document doc = Application.DocumentManager.MdiActiveDocument;

          Database db = doc.Database;

          Editor ed = doc.Editor;
          try

          {
              using (Transaction tr = db.TransactionManager.StartTransaction())

              {
                  BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);

                  BlockTableRecord btr = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
                  foreach (ObjectId dimId in btr)

                  {

                      if (dimId.ObjectClass.Name.ToLower().Contains("dimension"))

                      {

                          Dimension dim = (Dimension)tr.GetObject(dimId, OpenMode.ForWrite);

                          string originalText = dim.DimensionText;
                          string measureText = Math.Round( dim.Measurement,3).ToString();
                          if (!string.IsNullOrEmpty(originalText))

                          {

                              dim.DimensionText = "dzb_"+ originalText ;

                          }

                          else
                          { dim.DimensionText = "dzb_" + measureText; }
                          if (!string.IsNullOrEmpty(measureText))

                          {


                              ed.WriteMessage($"\n{measureText}\n");

                          }

                      }

                  }

                  tr.Commit();

                  ed.WriteMessage("\n修改标注文本前缀成功。");
              }

          }

          catch (System.Exception ex)

          {

              ed.WriteMessage("\n发生错误: " + ex.Message);

          }

      }
  }

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