造轮子_Json序列化之.NET开源类库Newtonsoft.Json

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
 
namespace JsonWithNewtonsoft
{
    class Program
    {
        static void Main(string[] args)
        {
            //使用StringReader读取Json
            string jsonText = @"{""Name"":""Jack"",""Age"":""22""}";
            JsonReader reader = new JsonTextReader(new StringReader(jsonText));
            while (reader.Read())
            {
                Console.WriteLine(reader.TokenType + "\t" + reader.ValueType + "\t" + reader.Value);
            }
            Console.WriteLine();
            //使用JObject读取Json
            JObject jo = JObject.Parse(jsonText);
            string[] values = jo.Properties().Select(item => item.Name.ToString() + ":" + item.Value.ToString()).ToArray();
            foreach (string s in values)
            {
                Console.WriteLine(s);
            }
            Console.WriteLine();

            //解析数组型数据
            string jsonArrayText1 = "[{‘Name‘:‘Tom‘,‘Age‘:‘16‘},{‘Name‘:‘Mary‘,‘Age‘:‘15‘}]";
            JArray ja = (JArray)JsonConvert.DeserializeObject(jsonArrayText1);
            string name1 = ja[1]["Name"].ToString();
            Console.WriteLine("数组型数据取法一：" + name1);
            Console.WriteLine();
            JObject o = (JObject)ja[1];
            string name2 = o["Name"].ToString();
            Console.WriteLine("数组型数据取法二：" + name2);
            Console.WriteLine();

            //嵌套格式
            string jsonTexta = "{\"shanghai\":{\"zone\":\"浦东\",\"zone_en\":\"pudong\"}}";
            JObject jsonObjt = JObject.Parse(jsonTexta);
            string zone = ((JObject)jsonObjt["shanghai"])["zone"].ToString();
            string zoneEn = ((JObject)jsonObjt["shanghai"])["zone_en"].ToString();
            Console.WriteLine(zone + "," + zoneEn);

            string jsonData = "{\"name\":\"lily\",\"age\":23,\"addr\":{\"city\":\"guangzhou\",\"province\":\"guangdong\"}}";
            JObject jsonObj = JObject.Parse(jsonData);
            string namea = jsonObj["name"].ToString();
            string age = jsonObj["age"].ToString();
            string city = ((JObject)jsonObj["addr"])["city"].ToString();
            string province = ((JObject)jsonObj["addr"])["province"].ToString();
            Console.WriteLine(namea + "," + age + "," + city + "," + province);
            Console.WriteLine(GetJsonValue(jsonObj.Children(), "province"));
            Console.WriteLine();

            string jsonDatab = "{\"addr\":[{\"city\":\"guangzhou\",\"province\":\"guangdong\"},{\"city\":\"guiyang\",\"province\":\"guizhou\"}]}";
            JObject jsonObjm = JObject.Parse(jsonDatab);
            JArray jar = JArray.Parse(jsonObjm["addr"].ToString());
            JObject j = JObject.Parse(jar[0].ToString());
            Console.WriteLine(j["city"]);
            

            //序列化Json
            StringWriter sw = new StringWriter();
            JsonWriter writer = new JsonTextWriter(sw);
            writer.WriteStartObject();
            writer.WritePropertyName("Name");
            writer.WriteValue("Jack");
            writer.WritePropertyName("Age");
            writer.WriteValue("26");
            writer.WriteEndObject();
            writer.Flush();
            string jsonTextb = sw.GetStringBuilder().ToString();
            Console.WriteLine(jsonTextb);
            Console.WriteLine();

            //序列化Student类
            Student stu = new Student() { Name="Jack",Age=20};
            JsonSerializer serializer=new JsonSerializer();
            StringWriter strw=new StringWriter();
            serializer.Serialize(new JsonTextWriter(strw),stu );
            Console.WriteLine(strw.GetStringBuilder().ToString());

            //反序列化Student类
            StringReader sr=new StringReader(strw.GetStringBuilder().ToString());
            Student st = (Student) serializer.Deserialize(new JsonTextReader(sr), typeof (Student));
            Console.WriteLine(st.Name + "=>" + st.Age); 
            Console.WriteLine();

            //序列化集合列表
            List<Student> students=new List<Student>();
            Student stu1=new Student(){Name="Jack",Age=20};
            Student stu2=new Student(){Name="Tom",Age=21}; 
            students.Add(stu1);
            students.Add(stu2);
            JsonSerializer serializer1=new JsonSerializer();
            StringWriter strw1=new StringWriter();
            serializer.Serialize(new JsonTextWriter(strw1),students);
            Console.WriteLine(strw1.GetStringBuilder().ToString());
            Console.WriteLine();

            List<Student2> student2s=new List<Student2>();
            Student2 stu3=new Student2(){Name="Jack",Age=20,Phones = new List<string>{"18627900216","18571643691"}};
            Student2 stu4 = new Student2() { Name = "Tom", Age = 21, Phones = new List<string> { "15972944805", "13349855388" } };
            student2s.Add(stu3);
            student2s.Add(stu4);
            JsonSerializer serializer2=new JsonSerializer();
            StringWriter strw2=new StringWriter();
            serializer2.Serialize(new JsonTextWriter(strw2),student2s);
            Console.WriteLine(strw2.GetStringBuilder().ToString());

            Console.Read();
        }

        /// <summary>
        /// 遍历动态json对象
        /// </summary>
        /// <param name="jToken">json对象的集合</param>
        /// <param name="key">json对象的属性</param>
        /// <returns>json对象的值</returns>
        public static string GetJsonValue(JEnumerable<JToken> jToken, string key)
        {
            IEnumerator enumerator = jToken.GetEnumerator();
            while (enumerator.MoveNext())
            {
                JToken jc = (JToken) enumerator.Current;


                if (jc is JObject || ((JProperty) jc).Value is JObject)
                {
                    return GetJsonValue(jc.Children(), key);
                }
                else
                {
                    if (((JProperty) jc).Name == key)
                    {
                        return ((JProperty) jc).Value.ToString();
                    }
                }
            }
            return null;
        }

        /// <summary>
        /// Student类,序列化时用
        /// </summary>
        public class Student
        {
            /// <summary>
            /// 姓名
            /// </summary>
            public string Name { get; set; }
            /// <summary>
            /// 年龄
            /// </summary>
            public int Age { get; set; } 
        }
        /// <summary>
        /// 修改Studnet类，添加电话号码字段
        /// </summary>
        public class Student2
        {
            /// <summary>
            /// 姓名
            /// </summary>
            public string Name { get; set; }
            /// <summary>
            /// 年龄
            /// </summary>
            public int Age { get; set; }
            //电话集合
            public List<string> Phones { get; set; }
        }
    }
}