json序列化与反序列化

1,写到类中,用到DataContractJsonSerializer,需要引用using System.Runtime.Serialization;

 public static class SerializerUtil
 {
          /// <summary>
        /// json字符串反序列化
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="jsonStr"></param>
        /// <returns></returns>
        public static T FromJson<T>(this string jsonStr)
        {
            try
            {
                DataContractJsonSerializer seri = new DataContractJsonSerializer(typeof(T));
                using (MemoryStream memory = new MemoryStream(Encoding.UTF8.GetBytes(jsonStr)))
                {
                    T jsonObj = (T)seri.ReadObject(memory);
                    return jsonObj;
                }
            }
            catch
            {
                return default(T);//如果有异常会返回null
            }          
        }
        /// <summary>
        /// json序列化
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        public static string ToJson(this object item)
        {
            try
            {
                DataContractJsonSerializer serializer = new DataContractJsonSerializer(item.GetType());
                using (MemoryStream ms = new MemoryStream())
                {
                    serializer.WriteObject(ms, item);
                    StringBuilder sb = new StringBuilder();
                    sb.Append(Encoding.UTF8.GetString(ms.ToArray()));
                    return sb.ToString();
                }
            }
            catch (Exception ex)
            {
                return "异常信息:"+ex.Message;
            }
        }

 }

使用例子：

//需要实例化的类要添加修饰符
        [DataContractAttribute]
        class JsonMessage
        {
            [DataMemberAttribute]
            public string Id;
            [DataMemberAttribute]
            public string Msg;
            [DataMemberAttribute]
            public string Url;
        }

        static void Main(string[] args)
        {
            JsonMessage obj = new JsonMessage();
            obj.Id = "1";
            obj.Msg = "\u606d\u559c\u60a8,\u53d1\u5e03\u6210\u529f";
            obj.Url = "http://post.88tc.com/149/105/s5";
            //将对象直接变为json数据
            string jsonStr = obj.ToJson();
            //Console.WriteLine(jsonStr);

            JsonMessage obj2 = SerializerUtil.FromJson<JsonMessage>(jsonStr);

            Console.WriteLine(obj2.Msg);

            Console.Read();
        }

输出结果是：恭喜您，发布成功。

obj.Msg的值是使用unicode编码表示的汉字。