C#中Json字符串的各种应用类

在程序中任何事物及信息都可以用对象进行描述和承载,除了比较流行的xml之外，还有一种简洁快速处理目标信息的形式那就是Json格式。

首先Json格式有自己固定的格式：例如person这个对象就可以简单的表示成{"name":"xxxx","age":12,"sex":"男"}形式。

Json格式的描述如下：先用{}包含需要表达的对象信息，在{}里使用PropertyName：Value进行对象属性的描述，同时Json字符串可以实现多层嵌套。例如：Json数据：[{PropertyName：Value,PropertyName：Value},{PropertyName：Value,PropertyName：Value}],Json嵌套格式：{PropertyName：Value,PropertyName：{PropertyName：Value,PropertyName：Value}}，理论上可以无限嵌套，但是这里建议嵌套最好不要超过3层。

对Json格式有了了解之后，那我们如何在C#中使用Json以及将已经实现的对象与Json联系起来。先个给出几个命名空间

using Newtonsoft.Json;
using System.Runtime.Serialization;
using System.ServiceModel;
using Newtonsoft.Json.Linq;
using System.IO;
using System.Runtime.Serialization.Json;

这里需要注意的是这些命名空间在 .net3.5及以上本版支持，同时必须在引用中添加 System.Runtime.Serialization.dll的引用。

这里主要使用到的类如下：

JsonSerializer ，StringWriter，StringReader ，JsonWriter，JsonConvert， DataContractJsonSerializer。

1.实现自定义类与Json进行相互转化处理：

    public class Person

    {

        public   Person()

        {

        }

        public Person(string Name, string Sex, int Age, string Address, PersonCharacter Character)

        {

            this.Name = Name;

            this.Sex = Sex;

            this.Age = Age;

            this.Address = Address;

            this.Character = Character;

        }

        public string Name { get; set; }

        public string Sex { get; set; }

        public int  Age { get; set; }

        public string Address { get; set; }

       public PersonCharacter Character { get; set; }

    }

    public class PersonCharacter

    {

        public string Daode { get; set; }

        public string Wenhua { get; set; }

        public string Xiuyang { get; set; }

    }

 public void ShowConvert()

        {

            Person person = new Person("lanar", "男", , "陕西", new PersonCharacter());

           JsonSerializer serializer = new JsonSerializer();

StringWriter sw = new StringWriter();

serializer.Serialize(new JsonTextWriter(sw), person );

Console.WriteLine(sw.GetStringBuilder().ToString());

StringReader sr = new StringReader(@"{""Name"":""ppp"", ""Age"":""}");

Person p1 = (Project)serializer.Deserialize(new JsonTextReader(sr), typeof(Person));

Console.WriteLine(p1.Name+ "=>" + p1.Age);

}

2. 契约方式：使用System.Runtime.Serialization.dll提供的DataContractJsonSerializer或者 JsonReaderWriterFactory实现

  [DataContract]

     public class Person

     {

         public   Person()

         {

         }

         public Person(string Name, string Sex, int Age, string Address, PersonCharacter Character)

         {

             this.Name = Name;

             this.Sex = Sex;

             this.Age = Age;

             this.Address = Address;

             this.Character = Character;

         }

         [DataMember]

         public string Name { get; set; }

         [DataMember]

         public string Sex { get; set; }

         [DataMember]

         public int  Age { get; set; }

            [DataMember]

         public string Address { get; set; }

         [DataMember]

         public PersonCharacter Character { get; set; }

     }

     public class PersonCharacter

     {

         public string Daode { get; set; }

         public string Wenhua { get; set; }

         public string Xiuyang { get; set; }

     }

         public void ShowConvert()

         {

             Person person = new Person("许展鹏", "男", , "陕西", new PersonCharacter());

             Person p = new Person() { Name = "四大圣地", Age = , Sex = "男", Character = new PersonCharacter() {  Daode="sds", Wenhua="dasd", Xiuyang="zzz"} };

             DataContractJsonSerializer serializer = new DataContractJsonSerializer(p.GetType());

             string jsonText;

             try

             {

                 using (MemoryStream stream = new MemoryStream())

                 {

                     serializer.WriteObject(stream, p);

                     jsonText = Encoding.UTF8.GetString(stream.ToArray());

                     Console.WriteLine(jsonText);

                 }

                 using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonText)))

                 {

                     DataContractJsonSerializer serializer1 = new DataContractJsonSerializer(typeof(Person));

                     Person p1 = (Person)serializer1.ReadObject(ms);

                 }

             }

             catch (Exception ex )

             {

                 throw new Exception(ex.Message,ex);

             }

         }