${iServerJava6R_ChartQueryFilterParameter_Tile}
        internal static string ToJson(ChartQueryFilterParameter param)
        {
            if (param == null)
            {
                return string.Empty;
            }
            StringBuilder sb = new StringBuilder();
            sb.Append("{")
              .Append(string.Format("\"isQueryPoint\":{0},", param.IsQueryPoint.ToString(System.Globalization.CultureInfo.InvariantCulture).ToLower()))
              .Append(string.Format("\"isQueryLine\":{0},", param.IsQueryLine.ToString(System.Globalization.CultureInfo.InvariantCulture).ToLower()))
              .Append(string.Format("\"isQueryRegion\":{0},", param.IsQueryRegion.ToString(System.Globalization.CultureInfo.InvariantCulture).ToLower()))
              .Append(string.Format("\"attributeFilter\":\"{0}\",", param.AttributeFilter))
              .Append(string.Format("\"chartFeatureInfoSpecCode\":{0}", param.ChartFeatureInfoSpecCode.ToString(System.Globalization.CultureInfo.InvariantCulture)))
              .Append("}");

            return sb.ToString();
        }