#region 将handle转换为objectid        /// 
        /// 将handle转换为objectid        /// 
        /// database        /// handle字符串        /// 
     
      ObjectId
             public static ObjectId GetObjectId(this Database db, string handle)        {            Handle h = new Handle(Int64.Parse(handle, NumberStyles.AllowHexSpecifier));            ObjectId id = ObjectId.Null;            db.TryGetObjectId(h, out id);            return id;        }        #endregion