求教：希望实现递归打印数据字典内容，程序出错。还请高手指点一二。

jdjb · 发表于 2011-4-23 18:32:00

public class testNod
{
      Database db = HostApplicationServices.WorkingDatabase;
      Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
      [CommandMethod("tess")]
      public void Test()
      {
         using (Transaction trans = db.TransactionManager.StartTransaction())
         {
            ObjectId nodId = db.NamedObjectsDictionaryId;
            nodeSearch(nodId);
            trans.Commit();
         }
      }
      private void nodeSearch(ObjectId nodId)
      {
         Transaction trans = db.TransactionManager.StartTransaction();
         DBDictionary nod = (DBDictionary)trans.GetObject(nodId, OpenMode.ForWrite);
         DbDictionaryEnumerator dictEnum = nod.GetEnumerator();
         ObjectId objId = new ObjectId();

         while (dictEnum.MoveNext())
         {
            objId = dictEnum.Value;
            string objName = dictEnum.Key;
            ed.WriteMessage("\n" + objId.ToString() + " " + objName);
            if (trans.GetObject(nodId, OpenMode.ForWrite) is DBDictionary)
            {
                  nodeSearch(objId);
            }
            else
            {
                  break;
            }
         }
      }
}

jdjb · 发表于 2011-4-24 00:46:00

我调试好的代码。还有两点不明请大家指教。
1.未调用trans.commit为何不发生错误，什么时候需要调用commit什么时候不需要。
2.是否有高手为小弟对trans实现机制稍作指点。
public class testNod
{
      Database db = HostApplicationServices.WorkingDatabase;
      Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
      [CommandMethod("tess")]
      public void Test()
      {
            ObjectId nodId = db.NamedObjectsDictionaryId;
            nodeSearch(nodId);
      }
      private void nodeSearch(ObjectId nodId)
      {
         using (Transaction trans = db.TransactionManager.StartTransaction())
         {
            DBDictionary nod = trans.GetObject(nodId, OpenMode.ForWrite) as DBDictionary;
            if (nod != null)
            {
                  DbDictionaryEnumerator dictEnum = nod.GetEnumerator();
                  ObjectId objId = new ObjectId();
                  while (dictEnum.MoveNext())
                  {
                     objId = dictEnum.Value;
                     string objName = dictEnum.Key;
                     ed.WriteMessage("\n" + objId.ToString() + " " + objName);
                     nodeSearch(objId);
                  }
            }
         }
      }
}

sieben · 发表于 2011-4-24 09:02:00

1,数据词典DBDictionary里面的可能是词典DBDictionary,也可能是扩展记录Xrecord
2,我也不大明白"什么时候需要调用commit什么时候不需要",我简单理解为只读不需要,写入则需要
(后注:这里回的是二楼)

sieben · 发表于 2011-4-24 09:07:00

  private void nodeSearch(ObjectId nodId)
      {
         DBDictionary nod = (DBDictionary)trans.GetObject(nodId, OpenMode.ForWrite);
            if (trans.GetObject(nodId, OpenMode.ForWrite) is DBDictionary)
            {
                  nodeSearch(objId);
            }
-------------------------------
1,这里怀疑变量写错了,if (trans.GetObject(nodId, OpenMode.ForWrite) is DBDictionary) 实是想写if (trans.GetObject(objId, OpenMode.ForWrite) is DBDictionary)
2,不管是objId 还是 nodId,你都重复打开了
(后注:这里回的是一楼,回二楼时没有看到一楼)

chmenf087 · 发表于 2011-4-24 16:49:00

.commit() 和.abort两个是对应的commit表示事务所有在commit之前的操作都被存储，而.abort则表示回滚，放弃前面所有对数据库的操作，因此没有需要在数据库中存储的操作时就不需要.commit()

求教：希望实现递归打印数据字典内容，程序出错。还请高手指点一二。

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