.NET JSON对象序列化和反序列化

class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("============================序列化单个对象为JSON格式======================================================");
            var jsonObj = GetUser().ToJsonString(); 
            Console.WriteLine(jsonObj + "\n\r ");
          
            Console.WriteLine("============================序列化集合对象为JSON格式======================================================");
            var jsonListObj = GetList().ToJsonString();
            Console.WriteLine(jsonListObj + "\n\r ");
         
            Console.WriteLine("============================序列化字符串集合======================================================");
            var jsonStrObj = GetString().ToJsonString();
            Console.WriteLine(jsonStrObj + "\n\r ");

            Console.WriteLine("============================构建一个JSON对象，反序列化为User对象===================================");
            //构建JSON对象
            string str = "{\"Description\":\"少林袈裟旗舰店店长\",\"Id\":\"1\",\"Name\":\"少林扫地神僧\"}";
            var user = str.ToJsonObject<User>();
            var entityObj = string.Format("json format str convert to user object:Id={0},Name={1},Description={2}", user.Id, user.Name, user.Description);
            Console.WriteLine(entityObj);
            Console.ReadKey();
        }

        public static User GetUser()
        {
            User user = new User()
            {
                Id = 1,
                Name = "无崖子",
                Description = "逍遥派掌门"
            };
            return user;
        }

        public static List<User> GetList()
        {
            List<User> list = new List<User>() { 
                new User(){ Id=1,Name="丁春秋", Description="星宿派掌门"},
                new User(){ Id=2,Name="庄聚贤", Description="无所事事的帅哥"},
                new User(){ Id=3,Name="段正淳", Description="风流倜傥大理王爷"}};
            return list;
        }


        public static IList<string> GetString()
        {
            IList<string> strList = new List<string>();
            strList.Add("乔峰");
            strList.Add("段誉");
            strList.Add("虚竹");
            return strList;
        }
    }


    public class User
    {
        public int Id { get; set; }

        public string Name { get; set; }

        public string Description { get; set; }
    }



    public static class StringExtensions
    {
        /// <summary>
        /// 将对象转化为Json字符串
        /// </summary>
        /// <typeparam name="T">对象类型</typeparam>
        /// <param name="instanse">对象本身</param>
        /// <returns>JSON字符串</returns>
        public static string ToJsonString<T>(this T instanse)
        {
            try
            {
                DataContractJsonSerializer js = new DataContractJsonSerializer(typeof(T));
                using (MemoryStream ms = new MemoryStream())
                {
                    js.WriteObject(ms, instanse);
                    ms.Flush();
                    ms.Seek(0, SeekOrigin.Begin);
                    StreamReader sr = new StreamReader(ms);
                    return sr.ReadToEnd();
                }
            }
            catch
            {
                return String.Empty;
            }
        }

        /// <summary>
        /// 将字符串转化为JSON对象，如果转换失败，返回default(T)
        /// </summary>
        /// <typeparam name="T">对象类型</typeparam>
        /// <param name="s">字符串</param>
        /// <returns>转换值</returns>
        public static T ToJsonObject<T>(this string s)
        {
            try
            {
                DataContractJsonSerializer js = new DataContractJsonSerializer(typeof(T));
                using (MemoryStream ms = new MemoryStream())
                {
                    StreamWriter sw = new StreamWriter(ms);
                    sw.Write(s);
                    sw.Flush();
                    ms.Seek(0, SeekOrigin.Begin);
                    return (T)js.ReadObject(ms);
                }
            }
            catch
            {
                return default(T);
            }
        }
    }