如何将 C# 类对象转换为 json？ [复制]

Posted 2023-02-19

【中文标题】如何将 C# 类对象转换为 json？ [复制]

【英文标题】：How to convert C# class object to json? [duplicate]

【发布时间】：2021-09-08 07:13:46

【问题描述】：

我有 2 个类，用户和用户响应：

public class User
    
        public int Id  get; set; 
        public string FirstName  get; set; 
        public string LastName get; set; 
        public decimal Balance  get; set; 
    

public class UserResponse
    
        public User UserInfo  get; set; 
        public string Age  get; set; 
        public string Gender  get; set; 
        public string Message  get; set; 
    

这是我想要收到的：

   "userInfo": 
      "id": "1",
      "firstName": "John",
      "lastName": "Doe",
      "balance": "1000"
    ,
   "age": "25",
   "gender": "Male",
   "message": "Hello",

所以问题是如何将 UserResponse 类转换为我想要的 json？

【问题讨论】：

你需要的是序列化。有很多工具和库可供您使用并将对象序列化为 json。最佳选择是 System.Text.Json 和 Newtonsoft.Json

是的，理论上我知道我需要序列化，但是我不知道构建方法的语法。

【参考方案1】：

我相信您是新手，想要一个工作样本来开始这项工作。

给你。

using System;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
                    
public class Program

    public static void Main()
    
        var o = new UserResponse();
        o.Age = "25";
        o.Gender = "Male";
        o.Message = "Hello";
        o.UserInfo = new User();
        o.UserInfo.Id = 1;
        o.UserInfo.FirstName = "John";
        o.UserInfo.LastName = "Doe";
        o.UserInfo.Balance = 1000M;
        var json = JsonConvert.SerializeObject(o, Formatting.Indented, new JsonSerializerSettings ContractResolver = new CamelCasePropertyNamesContractResolver()  );
        Console.WriteLine(json);
    


public class User
    
        public int Id  get; set; 
        public string FirstName  get; set; 
        public string LastName get; set; 
        public decimal Balance  get; set; 
    

public class UserResponse
    
        public User UserInfo  get; set; 
        public string Age  get; set; 
        public string Gender  get; set; 
        public string Message  get; set; 
    

在这里试试...

Sample Code

【参考方案2】：

你可以使用 JavascripSerializer

using System.Web.Script.Serialization;

var json = new javascriptSerializer().Serialize(objUserResponse);

【讨论】：

我也可以使用newtonsoft json吗？还是那另一种？

【参考方案3】：

您可以使用 System.Text.Json 中的 JsonSerializer

using System;
using System.Text.Json;
                    
public class Program

    public static void Main()
    
        UserResponse response = new UserResponse  Age = "35", Gender = "male", Message = "Hello", UserInfo = new User  Id = 1, Balance = 5.00m, FirstName = "John", LastName = "Smith"  ;
        Console.WriteLine(JsonSerializer.Serialize(response, new JsonSerializerOptions  PropertyNamingPolicy = JsonNamingPolicy.CamelCase, WriteIndented = true));
    


public class User

    public int Id  get; set; 
    public string FirstName  get; set; 
    public string LastName  get; set; 
    public decimal Balance  get; set; 


public class UserResponse

    public User UserInfo  get; set; 
    public string Age  get; set; 
    public string Gender  get; set; 
    public string Message  get; set; 
;

结果：

  "userInfo": 
    "id": 1,
    "firstName": "John",
    "lastName": "Smith",
    "balance": 5.00
  ,
  "age": "35",
  "gender": "male",
  "message": "Hello"

您可以在这里找到详细信息：https://docs.microsoft.com/en-us/dotnet/standard/serialization/system-text-json-customize-properties