CustomContractResolver.cs

 public class CustomContractResolver : DefaultContractResolver
    {
        private Dictionary<string, string[]> PropertyMappings { get; set; }

        public CustomContractResolver()
        {
            this.PropertyMappings = new Dictionary<string, string[]>
        {
            {"Values", new string[]{"AU", "EU" } }
        };
        }

        //protected override string ResolvePropertyName(string propertyName)
        //{
        //    string[] resolvedName = null;
        //    var resolved = this.PropertyMappings.TryGetValue(propertyName, out resolvedName);
        //    return (resolved) ? resolvedName : base.ResolvePropertyName(propertyName);
        //}
        private Dictionary<Type, Dictionary<string, string>> memberNameToJsonNameMap;

        //public DynamicMappingResolver(Dictionary<Type, Dictionary<string, string>> memberNameToJsonNameMap)
        //{
        //    this.memberNameToJsonNameMap = memberNameToJsonNameMap;
        //}

        protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
        {
            if(member.GetType() == typeof(double?[]) && member.Name == "Values")
            {
                string[] resolvedName = null;
                var resolved = this.PropertyMappings.TryGetValue(member.Name, out resolvedName);
                foreach (var item in resolvedName)
                {
                   // JsonProperty prop = base.CreateProperty(;

                }
            }
                JsonProperty prop = base.CreateProperty(member, memberSerialization);
            Dictionary<string, string> dict;
            string jsonName;
            if (memberNameToJsonNameMap.TryGetValue(member.DeclaringType, out dict) &&
                dict.TryGetValue(member.Name, out jsonName))
            {
                prop.PropertyName = jsonName;
            }
            return prop;
        }
    }