How to implement serialization and deserialization of Json (with code)

This time I will show you how to implement Json serialization and deserialization (with code). What are the precautions for Json serialization and deserialization? . The following is a practical case. Let’s take a look. take a look.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write and easy for machines to parse and generate. JSON is a text format that is completely language independent.

Translation: Json [javascript objectrepresentation method], it is a lightweight data exchange format, we can easily read and write it, and it is very Easily transformed and generated by computers, it is completely independent of language.

Json supports the following two data structures:

1. A collection of key-value pairs--various Programming languages all support this data structure;

2. A collection of ordered list type values--this includes arrays, sets, vectors, or sequences, etc. wait.

Json has the following expressions

1. Object

A "key/value" in no order. An object starts with curly braces "{" and ends with curly braces "}". After each "key", there is a colon, and commas are used to separate multiple key-value pairs.

For example:

  var user = {"name":"Manas","gender":"Male","birthday":"1987-8-8"}

2. Array

Set the order of values. An array starts with square brackets "[" and ends with square brackets " ]" ends, and all values ​​are separated by commas

For example:

var userlist = [{"user":{"name":"Manas","gender":"Male","birthday":"1987-8-8"}}, 
{"user":{"name":"Mohapatra","Male":"Female","birthday":"1987-7-7"}}]

3. String

Any number of Unicode characters, use quotation marks Mark and separate them with backslashes.

For example:

var userlist = "{\"ID\":1,\"Name\":\"Manas\",\"Address\":\"India\"}"

Okay, after introducing JSON, let’s get down to business.

There are three ways to serialize and deserialize:

1. ##Use

   JavaScriptSerializerClass

2. Using

   DataContractJsonSerializerClass

3. Using JSON.NET class library

Let’s first look at the use of DataContractJsonSerializer

DataContractJsonSerializer class helps us serialize and deserialize Json, he is in the assembly# In the System.Runtime.Serialization.Json namespace under ## System.Runtime.Serialization.dll.

First of all, here, I create a new console program and create a new class Student

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.Serialization;
namespace JsonSerializerAndDeSerializer
{
 [DataContract]
 public class Student
 {
  [DataMember]
  public int ID { get; set; }
  [DataMember]
  public string Name { get; set; }
  [DataMember]
  public int Age { get; set; }
  [DataMember]
  public string Sex { get; set; }
 }
}

Note: Above The contracts [DataMember] and [DataContract] in the Student entity must be added when using DataContractJsonSerializer for serialization and deserialization. It is not necessary to add the other two methods, and it is OK.

The code of our program:

To reference the assembly first, after introducing this namespace

//----------------------------------------------------------------------------------------------
//使用DataContractJsonSerializer方式需要引入的命名空间，在System.Runtime.Serialization.dll.中
using System.Runtime.Serialization.Json;
//--------------------------------------------------------------------------------------------

#region 1.DataContractJsonSerializer方式序列化和反序列化
   Student stu = new Student()
    {
     ID = 1,
     Name = "曹操",
     Sex = "男",
     Age = 1000
    };
   //序列化
   DataContractJsonSerializer js = new DataContractJsonSerializer(typeof(Student));
   MemoryStream msObj = new MemoryStream();
   //将序列化之后的Json格式数据写入流中
   js.WriteObject(msObj, stu);
   msObj.Position = 0;
   //从0这个位置开始读取流中的数据
   StreamReader sr = new StreamReader(msObj, Encoding.UTF8);
   string json = sr.ReadToEnd();
   sr.Close();
   msObj.Close();
   Console.WriteLine(json);
   //反序列化
   string toDes = json;
   //string to = "{\"ID\":\"1\",\"Name\":\"曹操\",\"Sex\":\"男\",\"Age\":\"1230\"}";
   using (var ms = new MemoryStream(Encoding.Unicode.GetBytes(toDes)))
   {
    DataContractJsonSerializer deseralizer = new DataContractJsonSerializer(typeof(Student));
    Student model = (Student)deseralizer.ReadObject(ms);// //反序列化ReadObject
    Console.WriteLine("ID=" + model.ID);
    Console.WriteLine("Name=" + model.Name);
    Console.WriteLine("Age=" + model.Age);
    Console.WriteLine("Sex=" + model.Sex);
   }
   Console.ReadKey(); 
   #endregion

the result after running is:

Look at using JavaScriptJsonSerializer: JavaScriptSerializer is a class which helps to serialize and deserialize JSON. It is present in namespace System.Web.Script.Serialization which is available in assembly System.Web.Extensions.dll. To serialize a .Net object to JSON string use Serialize method. It's possible to deserialize JSON string to .Net object using Deserialize or DeserializeObject methods. Let's see how to implement serialization and deserialization using JavaScriptSerializer.

Please quote here first

//-----------------------------------------------------------------------------------------
//使用JavaScriptSerializer方式需要引入的命名空间，这个在程序集System.Web.Extensions.dll.中
using System.Web.Script.Serialization;
//----------------------------------------------------------------------------------------

#region 2.JavaScriptSerializer方式实现序列化和反序列化
   Student stu = new Student()
    {
     ID = 1,
     Name = "关羽",
     Age = 2000,
     Sex = "男"
    };
   JavaScriptSerializer js = new JavaScriptSerializer();
   string jsonData = js.Serialize(stu);//序列化
   Console.WriteLine(jsonData);
   ////反序列化方式一：
   string desJson = jsonData;
   //Student model = js.Deserialize<student>(desJson);// //反序列化
   //string message = string.Format("ID={0},Name={1},Age={2},Sex={3}", model.ID, model.Name, model.Age, model.Sex);
   //Console.WriteLine(message);
   //Console.ReadKey(); 
   ////反序列化方式2
   dynamic modelDy = js.Deserialize<dynamic>(desJson); //反序列化
   string messageDy = string.Format("动态的反序列化,ID={0},Name={1},Age={2},Sex={3}",
    modelDy["ID"], modelDy["Name"], modelDy["Age"], modelDy["Sex"]);//这里要使用索引取值，不能使用对象.属性
   Console.WriteLine(messageDy);
   Console.ReadKey(); 
   #endregion</dynamic></student>

结果是：

 

最后看看使用JSON.NET的情况，引入类库：

 

下面的英文，看不懂可略过。。。

Json.NET is a third party library which helps conversion between JSON text and .NET object using the JsonSerializer. The JsonSerializer converts .NET objects into their JSON equivalent text and back again by mapping the .NET object property names to the JSON property names. It is open source software and free for commercial purposes.

The following are some awesome【极好的】 features,
Flexible JSON serializer for converting between .NET objects and JSON.
LINQ to JSON for manually reading and writing JSON.
High performance, faster than .NET's built-in【内嵌】 JSON serializers.
Easy to read JSON.
Convert JSON to and from XML.
Supports .NET 2, .NET 3.5, .NET 4, Silverlight and Windows Phone.
Let's start learning how to install and implement:

In Visual Studio, go to Tools Menu -> Choose Library Package Manger -> Package Manager Console. It opens a command window where we need to put the following command to install Newtonsoft.Json.

Install-Package Newtonsoft.Json
OR
In Visual Studio, Tools menu -> Manage Nuget Package Manger Solution and type “JSON.NET” to search it online. Here's the figure,

 

//使用Json.NET类库需要引入的命名空间
//-----------------------------------------------------------------------------
using Newtonsoft.Json;
//-------------------------------------------------------------------------

#region 3.Json.NET序列化
   List<student> lstStuModel = new List<student>() 
   {
   
   new Student(){ID=1,Name="张飞",Age=250,Sex="男"},
   new Student(){ID=2,Name="潘金莲",Age=300,Sex="女"}
   };
   //Json.NET序列化
   string jsonData = JsonConvert.SerializeObject(lstStuModel);
   Console.WriteLine(jsonData);
   Console.ReadKey();
   //Json.NET反序列化
   string json = @"{ 'Name':'C#','Age':'3000','ID':'1','Sex':'女'}";
   Student descJsonStu = JsonConvert.DeserializeObject<student>(json);//反序列化
   Console.WriteLine(string.Format("反序列化： ID={0},Name={1},Sex={2},Sex={3}", descJsonStu.ID, descJsonStu.Name, descJsonStu.Age, descJsonStu.Sex));
   Console.ReadKey(); 
   #endregion</student></student></student>

运行之后，结果是：

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