using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Data;

 using System.Web;

 using GongHuiNewtonsoft.Json.Linq;  

 namespace JSONDemo

 {

     class Program

     {

         static void Main(string[] args)

         {

             string json = @"{

                 'post':{

                     'Title':'修改JArray和JObject',

                     'Link':'http://write.blog.csdn.net',

                     'Description':'这是一个修改JArray和JObject的演示案例',

                     'Item':[]

                 }

             }";  

             JObject o = JObject.Parse(json);

             JObject post = (JObject)o["post"];  

             post["Title"] = ((string)post["Title"]).ToUpper();

             post["Link"] = ((string)post["Link"]).ToUpper();  

             post.Property("Description").Remove();  

             post.Property("Link").AddAfterSelf(new JProperty("New", "新添加的属性"));  

             JArray a = (JArray)post["Item"];

             a.Add("修改JArray");

             a.Add("修改JObject");  

             Console.WriteLine(o.ToString());

         }

     }

 }