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startTileRow and startTileColumn's  json string not generate  in AGSLOD

Question asked by niuruigang on Jul 23, 2012
Latest reply on Jul 30, 2012 by njarecha-esristaff
hello guys,i was a new arcgis iPhone developer,now i want convert AGSLOD object to json string for store database,but when i generate json string use encodeToJSON and AGSJSONRepresentation method, the code was below:
            NSDictionary *TileInfoDic = [_tileInfo encodeToJSON];
            NSString *TileInfoJson = [TileInfoDic AGSJSONRepresentation];
            AGSLOD *lod = nil;
            for (lod in _TileInfo.lods)
                NSDictionary *lodDic = [lod encodeToJSON];
                NSLog(@"%@", [lodDic AGSJSONRepresentation]);
the conver result was below:

in the result startTileRow???startTileColumn's???endTileRow and endTileColumn's json string not generated, by debug i know that there are normal values in  these property.
can yours give me some point for above issue, thanks very much!