C# 使用 Automapper 转换为 DTO/JSON

Question

我正在尝试使用 Automapper 从 API 返回这种格式的 JSON：

  {
    "Name": "Jason",
    "Subjects":
      [
        "Maths":{
                  "CourseName": "Maths",
                  "Score": 70
                },
      "English":{
                  "CourseName": "English",
                  "Score": 80
                }
      ]
  }

这是一个特殊的 json，我们可以看到在 Subjects 中，每个主题的名称实际上是 CoursName 属性。 这是我的模型和 DTO：

public class Student
{
    public string Name {get; set;}
    public ICollection Subjects {get; set;}
}

public class Subject
{
    public int Id {get; set;}
    public string CourseName {get; set;}
  public int Score {get; set;}
}

问题出在主题内部，每个主题都有一个来自对象内部的 CourseName 的名称。

Answer 1

根据jsonformatter.curiousconcept.com，您提供的 JSON 无效。

此代码适用于有效的 JSON 输出 (RFC 8259)。

using System.Collections.Generic;
using Newtonsoft.Json;

namespace JsonProgram
{
    public class Program
    {
        static void Main(string[] args)
        {
            var student = new Student
            {
                Name = "Jason",
                Subjects = new List<Subject>
                {
                    new Subject
                    {
                        Id = 1,
                        CourseName = "Maths",
                        Score = 70
                    },
                    new Subject
                    {
                        Id = 2,
                        CourseName = "English",
                        Score = 80
                    },
                }
            };
            var json = ToStudentJson(student);
        }

        private static string ToStudentJson(Student student)
        {
            var subjects = new List<Dictionary<string, SubjectBase>>();
            foreach (var subject in student.Subjects)
            {
                var dict = new Dictionary<string, SubjectBase>();
                dict.Add(subject.CourseName, new SubjectBase { CourseName = subject.CourseName, Score = subject.Score });
                subjects.Add(dict);
            }

            var studentJson = new StudentJson
            {
                Name = student.Name,
                Subjects = subjects.ToArray()
            };

            return JsonConvert.SerializeObject(studentJson);
        }
    }

    public class StudentJson
    {
        public string Name { get; set; }
        public Dictionary<string, SubjectBase>[] Subjects { get; set; }
    }
    public class Student
    {
        public string Name { get; set; }
        public ICollection<Subject> Subjects { get; set; }
    }

    public class Subject : SubjectBase
    {
        public int Id { get; set; }
    }

    public class SubjectBase
    {
        public string CourseName { get; set; }
        public int Score { get; set; }
    }
}

输出：

{
    "Name": "Jason",
    "Subjects": [
        {
            "Maths": {
                "CourseName": "Maths",
                "Score": 70
            }
        },
        {
            "English": {
                "CourseName": "English",
                "Score": 80
            }
        }
    ]
}