C#基础---C#如何对Json字符串处理

　　　　Json字符串对于做web应用的应该很熟悉，其实在很多请求我们返回的都是Json字符串。那对于C#代码如何处理Json字符串呢，.Net封装了一个类叫做JavaScriptSerializer[MSDN Library 链接http://msdn.microsoft.com/en-us/library/ee191864(v=vs.110).aspx]；这个类提供了一个方法。

下面这个是我在快递100往抓取的一个圆通的快递信息。对于我们有用的信息是快递时间，快递状况。那我该如何来做。　

{"message":"ok","nu":"9356359685","ischeck":"1","com":"yuantong","status":"200","condition":"F00","state":"3","data":[{"time":"2014-09-01 21:19:06","context":"甘肃省武威市公司已签收 ","ftime":"2014-09-01 21:19:06"},{"time":"2014-09-01 09:09:28","context":"甘肃省武威市公司派件中 ","ftime":"2014-09-01 09:09:28"},{"time":"2014-09-01 09:06:27","context":"甘肃省武威市公司已收入 ","ftime":"2014-09-01 09:06:27"},{"time":"2014-08-31 19:53:47","context":"甘肃省兰州市公司已发出 ","ftime":"2014-08-31 19:53:47"},{"time":"2014-08-31 19:17:41","context":"甘肃省兰州市公司已收入 ","ftime":"2014-08-31 19:17:41"},{"time":"2014-08-28 23:44:26","context":"广东省深圳市横岗公司已打包 ","ftime":"2014-08-28 23:44:26"},{"time":"2014-08-28 23:19:12","context":"广东省深圳市横岗公司已收件 ","ftime":"2014-08-28 23:19:12"},{"time":"2014-08-28 21:55:35","context":"广东省深圳市横岗公司已收件 ","ftime":"2014-08-28 21:55:35"}]}

1. 首先分析Json字符串结构. Json{ message,nu,isCheck,Data{time,context,ftime}};我们先定义一个类，取名为PostalDeliveryModel，类名的结构需要与Json结构对应，名称需要保持一样[忽略大小写],其次对应的字段说会自动转换类型的，类型如果不符合会抛出异常

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TestJson
{
    public class PostalDeliveryModel
    {
        private string message = string.Empty;
        private string nu = string.Empty;
        private List<SingalData> data = new List<SingalData>();

        // Puclic的名字需要与Json字符串相同,但是忽略大小写
        public string Message 
        {
            get { return this.message; }
            set { this.message = value; }
        }

        public string Nu
        {
            get { return this.nu; }
            set { this.nu = value; }
        }

        public List<SingalData> Data
        {
            get { return this.data; }
            set { this.data = value; }
        }
    }

    public class SingalData
    {
        private DateTime time = System.DateTime.Now;
        private string context = string.Empty;
        private DateTime ftime = System.DateTime.Now;

        public DateTime Time
        {
            get { return this.time; }
            set { this.time = value; }
        }

        public DateTime FTime
        {
            get { return this.ftime; }
            set { this.ftime = value; }
        }

        public string Context
        {
            get { return this.context; }
            set { this.context = value; }
        }
    }
}

2.对象什么好后只需要调用方法即可:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Web.Script.Serialization; // 此命名空间对应的框架是 System.Web.Extensions

namespace TestJson
{
    public class Program
    {
       
        public static void Main(string[] args)
        {
            string jsonStr = new StreamReader("JsonData.txt").ReadToEnd();
            PostalDeliveryModel mode = new JavaScriptSerializer().Deserialize<PostalDeliveryModel>(jsonStr);
            Console.ReadKey();
            
        }
    }
}