autocad.net QQ群:193522571 根据handle转换成ObjectId

    /// <summary>
    /// 从句柄转换成ObjectId
    /// Version : 2010.03.29 Sieben
    /// </summary>
    /// <param name="handle">句柄,可以是Handle,string,int,long数据类型</param>
    /// <returns>成功返回句柄所对应的ObjectId，否则返回ObjectId.Null</returns>
    public static ObjectId HandleToObjectId(object handle)
    {
      try
      {
        if (handle == null) return ObjectId.Null;
        ObjectId tId2 = ObjectId.Null;
        if (handle is Handle)
          return sc.db.GetObjectId(false, (Handle)handle, 0);
        else if (handle is string)
        {
          string tStr = handle.ToString().Trim();

          if (tStr == "")
            return ObjectId.Null;
          else if (tStr == "0")
            return ObjectId.Null;
          else
          {
            long lNum = Convert.ToInt64(tStr, 16);
            if (lNum == 0L)
              return ObjectId.Null;
            else
              return sc.db.GetObjectId(false, new Handle(lNum), 0);
          }
        }
        else if (handle is int || handle is long)
        {
          long lNum = (long)handle;
          if (lNum == 0L)
            return ObjectId.Null;
          else
            return sc.db.GetObjectId(false, new Handle(lNum), 0);
        }
        else
          return ObjectId.Null;
      }
      catch
      {
        return ObjectId.Null;
      }
    }