static void Main(string[] args)

        {

            {

                Console.WriteLine("----------全局设置----------");

                Newtonsoft.Json.JsonSerializerSettings setting = new Newtonsoft.Json.JsonSerializerSettings();

                JsonConvert.DefaultSettings = new Func<JsonSerializerSettings>(() =>

                {

                    //日期类型默认格式化处理

                    setting.DateFormatHandling = Newtonsoft.Json.DateFormatHandling.MicrosoftDateFormat;

                    setting.DateFormatString = "yyyy-MM-dd HH:mm:ss";

                    //空值处理

                    setting.NullValueHandling = NullValueHandling.Ignore;

                    //Bool类型转换设置

                    setting.Converters.Add(new BoolConvert("是,否"));

                    return setting;

                });

                List<User> users = new List<User>() {

                new User{ UserName = "wjl",Age =22,State = UserState.Deleted,Email="131565452@qq.com" },

                new User{ UserName = "hyf",Age =22,State = UserState.Normal ,Email="456461@qq.com"}

            };

                var resUserJson = JsonConvert.SerializeObject(users);

                Console.WriteLine(resUserJson);

            }

            {

                Console.WriteLine("----------设置忽略为空的属性----------");

                User user = new User { UserName = "ljm", Age = 22, State = UserState.Normal };

                JsonSerializerSettings jsetting = new JsonSerializerSettings();

                jsetting.NullValueHandling = NullValueHandling.Ignore; //设置忽略为空的属性 , Email 将不显示

                Console.WriteLine(JsonConvert.SerializeObject(user, Formatting.Indented, jsetting));

            }

            {

                Console.WriteLine("----------自定义显示的字段----------");

                Student stu = new Student { stuName = "ljm", className = "计算机1班" };

                JsonSerializerSettings jsetting_stu = new JsonSerializerSettings();

                jsetting_stu.ContractResolver = new LimitPropsContractResolver(new string[] { "stuName" }, false);

                Console.WriteLine(JsonConvert.SerializeObject(stu, Formatting.Indented, jsetting_stu));

            }

            Console.ReadLine();

        }