C#/.net/WCF 使用DataMember Order 无视属性自上而下的输出顺序，自定义Json输出排序，该方法大神也不一定会！

 static void Main(string[] args)
        {
            Models m = new Models() { a = "1", b = "2" };
            string json=JsonSerializer<Models>(m);
            Console.WriteLine(json);
            //输出结果：b在a前边
            //{"b":"2","a":"1"}
        }
        //自定义类
        [DataContract]
        public class Models
        {
            //Order索引从0开始，越小越靠前
            [DataMember(Order = 2)]
            public string a { get; set; }
            [DataMember(Order = 1)]
            public string b { get; set; }

        }
        //JSON序列化
        public static string JsonSerializer<T>(T t)
        {
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
            MemoryStream ms = new MemoryStream();
            ser.WriteObject(ms, t);
            string jsonString = Encoding.UTF8.GetString(ms.ToArray());
            ms.Close();
            return jsonString;
        }
        /// <summary>
        /// JSON反序列化
        /// </summary>
        public static T JsonDeserialize<T>(string jsonString)
        {
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
            MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
            T obj = (T)ser.ReadObject(ms);
            return obj;
        }