C# json字符串处理

1、添加引用Newtonsoft.Json.dll（附件：https://files.cnblogs.com/files/chen-yuan/Newtonsoft.zip）；

2、引用：

using Newtonsoft.Json.Linq;

3、具体代码： 

string students = "{"grade":"6","class":"1","students":[{ "id":"1","name":"Lily","sex":"女?"},{"id":"2","name":"Jack","sex":"男D"},{"id":"3","name":"Lucy","sex":"女?"}]}";
JObject studentsJson = JObject.Parse(students);
//年级
string grade = studentsJson["grade"].ToString();
//获得第二个学生的姓名
string name1 = studentsJson["students"][1]["name"].ToString();  //Or
name1 = studentsJson["students"].AsEnumerable().ElementAt(1)["name"].ToString();
//遍历学生信息
var studentsList = studentsJson["students"].AsEnumerable();
foreach (var item in studentsList)
{
    string a = item["name"].ToString();
}
//获得学生Jack的信息和性别
var Jack = studentsJson["students"].AsEnumerable().Where(t => t.Value<string>("name") == "Jack");
string Jack_sex = Jack.FirstOrDefault()["sex"].ToString();
//获得女生的信息集合
var Girls = studentsJson["students"].AsEnumerable().Where(t => t.Value<string>("sex") == "女?");

在不确定key的情况下要遍历所有数据，在网上找到的，自己Mark一下
JObject o = JObject.Parse(str);
IEnumerable properties = o.Properties();
foreach (JProperty item in properties)
{
Console.WriteLine(item.Name + ":" + item.Value);
}