private static string[] GetParameters(GeoNameRequest request)
        {
            var ci             = System.Globalization.CultureInfo.InvariantCulture;
            var requestType    = request.GetType();
            var classHierarchy = Enumerable.Repeat(requestType, 1)
                                 .Concat(requestType.BaseClasses())
                                 .Select(x => x)
                                 .Reverse()
                                 .ToList();

            var parameters = classHierarchy
                             .SelectMany(
                (ti, i) => ti.GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly)
                .Where(x => x.CanRead)
                .Select(x => new { pi = x, level = i, ca = x.GetCustomAttributes(false).OfType <JsonPropertyAttribute>().FirstOrDefault() })
                .GroupBy(x => x.pi.Name)
                .Select(g => g.OrderByDescending(x => x.level).FirstOrDefault())
                .Select(
                    x => new {
                Value = string.Format(ci, "{0}", x.pi.GetValue(request, null)),
                Name  = x.ca?.PropertyName,
                Order = x.level * 1000 + x.ca?.Order
            }
                    )
                .Where(x => !string.IsNullOrWhiteSpace(x.Name) && !string.IsNullOrWhiteSpace(x.Value))
                )
                             .OrderBy(x => x.Order)
                             .Select(x => Uri.EscapeUriString($"{x.Name}={string.Format(ci, "{0}", x.Value)}"))
                             .ToArray();

            return(parameters);
        }
        internal static string ToQueryString(this GeoNameRequest request, string serviceName)
        {
            var ci = System.Globalization.CultureInfo.InvariantCulture;

#if (NET40)
            var classHierarchy = Enumerable.Repeat(request.GetType(), 1)
                                 .Concat(request.GetType().BaseClasses())
                                 .Select(x => x)
                                 .Reverse()
                                 .ToList();

            var parameters = classHierarchy
                             .SelectMany(
                (ti, i) => ti.GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly)
                .Where(x => x.CanRead)
                .Select(x => new { pi = x, ca = x.GetCustomAttributes(false).OfType <JsonPropertyAttribute>().FirstOrDefault() })
                .Select(
                    x => new {
                Value = string.Format(ci, "{0}", x.pi.GetValue(request, null)),
                Name  = x.ca?.PropertyName,
                Order = i * 100 + x.ca?.Order
            }
                    )
                .Where(x => !string.IsNullOrWhiteSpace(x.Name) && !string.IsNullOrWhiteSpace(x.Value))
                )
                             .OrderBy(x => x.Order)
                             .Select(x => System.Uri.EscapeUriString($"{x.Name}={string.Format(ci, "{0}", x.Value)}"))
                             .ToList();
#else
            var classHierarchy = Enumerable.Repeat(request.GetType(), 1)
                                 .Concat(request.GetType().BaseClasses())
                                 .Select(x => x.GetTypeInfo())
                                 .Reverse()
                                 .ToList();

            var parameters = classHierarchy
                             .SelectMany(
                (ti, i) => ti.DeclaredProperties.Where(x => x.CanRead && x.GetMethod.IsPublic)
                .Select(x => new { pi = x, ca = x.GetCustomAttribute <JsonPropertyAttribute>() })
                .Select(
                    x => new {
                Value = string.Format(ci, "{0}", x.pi.GetValue(request)),
                Name  = x.ca?.PropertyName,
                Order = i * 100 + x.ca?.Order
            }
                    )
                .Where(x => !string.IsNullOrWhiteSpace(x.Name) && !string.IsNullOrWhiteSpace(x.Value))
                )
                             .OrderBy(x => x.Order)
                             .Select(x => System.Uri.EscapeUriString($"{x.Name}={string.Format(ci, "{0}", x.Value)}"))
                             .ToList();
#endif

            var queryString = $"{serviceName}?{string.Join("&", parameters)}";

            return(queryString);
        }