使用Newtonsoft.Json进行JSON反序列化操作

来源：互联网发布：灯光编程软件编辑：程序博客网时间：2024/06/08 04:16

本篇主要介绍两种使用Newtonsoft.Json进行JSON格式文件反序列化的操作。

1. 直接将程序中string格式的JSON字段进行反序列化

1）在VS中创建TestJSON的控制台应用程序

2）添加Newtonsoft.Json引用，并添加类TestTag.cs

在TestTag类中添加属性：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using Newtonsoft.Json;namespace TestJson{    public class TestTag    {        //类中添加以下属性        public int ViewId { get; set; }        public string Name { get; set; }        public bool IsValid { get; set; }        public int SeqNum { get; set; }    }}

3）在Program主程序中实现反序列化

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using Newtonsoft.Json;namespace TestJson{    class Program    {        static void Main(string[] args)        {            //Json对象            string strJson = "[{'ViewId':01,'Name':'Test 1','IsValid':true,'SeqNum':'01'},{'ViewId':02,'Name':'Test 2','IsValid':false,'SeqNum':'02'}]";            List<TestTag> listView = JsonConvert.DeserializeObject<List<TestTag>>(strJson);            foreach (var view in listView)            {                Console.WriteLine("ViewId:{0}", view.ViewId);                Console.WriteLine("Name:{0}", view.Name);                Console.WriteLine("IsValid:{0}", view.IsValid);                Console.WriteLine("SeqNum:{0}", view.SeqNum);            }            Console.ReadKey();        }    }}

4）输出显示

2. 将JSON格式外部文件进行反序列化

1）同步骤1所示，创建工程TestJSON，引入库Newtonsoft.Json，创建类ELEDevice.cs与JSON外部文件ELEDevice.json

2）输入JSON格式文件（ELEDevice.json）对象

[    {        "ELEName": "ELE1",        "ELEType": "cc25",        "PortName": "COM3",        "BaudRate": 115200    },    {         "ELEName": "ELE2",        "ELEType": "ss70",        "PortName": "COM4",        "BaudRate": 10000    }]

3）输入ELEDevice.cs类的属性及反序列化方法对象

a. 添加引用类库

b. 在类添加json反序列化属性

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Runtime.Serialization;using Newtonsoft.Json;using System.IO;namespace TestJSON{    [DataContract]    public class ELEDevice    {        /// <summary>        /// 名称        /// </summary>        [DataMember]        public string ELEName { get;set;}        /// <summary>        /// 类型        /// </summary>        [DataMember]        public string ELEType { get; set; }        /// <summary>        /// 串口名        /// </summary>        [DataMember]        public string PortName { get; set; }        /// <summary>        /// 波特率        /// </summary>        [DataMember]        public int BaudRate { get; set; }        /// <summary>        /// 反序列化操作        /// </summary>        /// <param name="fileName">外部Json文件</param>        /// <returns></returns>        public static List<ELEDevice> Deserialize(string fileName)        {            using(StreamReader fs = new StreamReader(fileName, Encoding.UTF8, true))            {                string str = fs.ReadToEnd();                List<ELEDevice> devs = JsonConvert.DeserializeObject<List<ELEDevice>>(str);                return devs;            }        }        /// <summary>        /// 序列化操作        /// </summary>        /// <param name="fileName">外部Json文件</param>        /// <param name="devices">序列化对象</param>        public static void Serialize(string fileName, List<ELEDevice> devices)        {            using (StreamWriter fs = new StreamWriter(fileName))            {                //将序列化后的Json格式数据写入流中                string str = JsonConvert.SerializeObject(devices, Formatting.Indented);                fs.Write(str);            }        }    }}

注意：上面代码中序列化类和属性定义之前要添加[DataContract]与[DataMember]

4）在Program.cs主程序中实现

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using Newtonsoft.Json;namespace TestJSON{    class Program    {                static void Main(string[] args)        {            List<ELEDevice> devs = ELEDevice.Deserialize(@"..\..\ELEDevice.json");            foreach (var ELE in devs)            {                Console.WriteLine(string.Format("ELEName:{0}", ELE.ELEName));                Console.WriteLine(string.Format("ELEType:{0}", ELE.ELEType));                Console.WriteLine(string.Format("PortName:{0}", ELE.PortName));                Console.WriteLine(string.Format("BaudRate:{0}", ELE.BaudRate));                Console.WriteLine();            }            Console.ReadKey();        }    }}

5）控制台显示输出

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