JSON字符串与C#对象互转：借助Newtonsoft.Json

Newtonsoft.Json，是.Net中开源的Json序列化和反序列化工具，官方地址：http://www.newtonsoft.com/json。

功能比较多，效率比较高，官方给出对比数据

50% faster than DataContractJsonSerializer, and 250% faster than JavaScriptSerializer.

比较常用的功能除了序列化发序列化之外，还有 Linq To Json、Json Path、 XML support等

使用方法简单：

使用命令

Install-Package Newtonsoft.Json

或者右键，项目》Nuget包管理，添加

简单使用实例如下：

1.定义类：

/// <summary>  
/// 学生信息实体  
/// </summary>  
public class Student  
{  
    public int ID { get; set; }  
    public string Name { get; set; }  
    public Class Class { get; set; }  
}  
/// <summary>  
/// 学生班级实体  
/// </summary>  
public class Class  
{  
    public int ID { get; set; }  
    public string Name { get; set; }

2.序列化，反序列化实体对象，实体集合，匿名对象：

//List<Student> list = JsonConvert.DeserializeObject<Student[]>(json1).ToList();

Student stu = new Student();  
stu.ID = 1;  
stu.Name = "张三";  
stu.Class = new Class() { ID = 0121, Name = "CS0121" };  
  
//使用方法1  
//实体序列化、反序列化  
//结果：{"ID":1,"Name":"张三","Class":{"ID":121,"Name":"CS0121"}}  
string json1 = JsonConvert.SerializeObject(stu);  
Console.WriteLine(json1);  
Student stu2 = JsonConvert.DeserializeObject<Student>(json1);  
Console.WriteLine(stu2.Name + "---" + stu2.Class.Name);  
  
//实体集合，序列化和反序列化  
List<Student> stuList = new List<Student>() { stu, stu2 };  
string json2 = JsonConvert.SerializeObject(stuList);  
Console.WriteLine(json2);  
List<Student> stuList2 = JsonConvert.DeserializeObject<List<Student>>(json2);  
foreach (var item in stuList2)  
{  
    Console.WriteLine(item.Name + "----" + item.Class.Name);  
}  
  
//匿名对象的解析,  
//匿名独享的类型  obj.GetType().Name： "<>f__AnonymousType0`2"  
var obj = new { ID = 2, Name = "李四" };  
string json3 = JsonConvert.SerializeObject(obj);  
Console.WriteLine(json3);  
object obj2 = JsonConvert.DeserializeAnonymousType(json3, obj);  
Console.WriteLine(obj2.GetType().GetProperty("ID").GetValue(obj2));  
object obj3 = JsonConvert.DeserializeAnonymousType(json3, new { ID = default(int), Name = default(string) });  
Console.WriteLine(obj3.GetType().GetProperty("ID").GetValue(obj3));  
//匿名对象解析，可以传入现有类型，进行转换  
Student stu3 = new Student();  
stu3 = JsonConvert.DeserializeAnonymousType(json3, new Student());  
Console.WriteLine(stu3.Name);

2.控制字符串的序列化，更方便：

JsonSerializerSettings settings = new JsonSerializerSettings();  
settings.DateFormatString = "yyyy-MM-dd";  
string str = JsonConvert.SerializeObject(_Context.students.First(), settings);  
Console.WriteLine(str);

{"sno":"101","sname":"李军","ssex":"男","sbirthday":"1976-02-20","_class":"95033"}

JSON字符串与C#对象互转：借助Newtonsoft.Json

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