流编写器没有在webapi中写入JSON文件

Question

我试图使用webapi在JSON文件中写入数据，但是流编写器没有将数据写入文件。

JSON档案：

{
"Students": [
  {
  "id": 1,
  "name": "Ravi",
  "department": "IT"
  },

 {
  "id": 2,
  "name": "Raj",
  "department": "hr"
  },
{
  "id": 3,
  "name": "avi",
  "department": "it"
 },
{
  "id": 4,
  "name": "rome",
  "department": "HR"
 },
 {
  "id":5,
  "name": "virat",
  "department": "HR"
 },
 {
  "id":6 ,
  "name": "Tushar",
  "department": "RM"
 }
]
}

班级

     public class Student
{
    public int Id { get; set; }
    public string Name { get; set; }

    public string Department { get; set; }
}

    public class Students
{
    public List<Student> students { get; set; }
}   

Api控制器:将数据写入json文件的HttpPost方法。

    [Route("api/[controller]")]
[ApiController]
public class StudentsController : ControllerBase
{

  [HttpPost]
    public IActionResult Add(Students _Student)
    {        
        using (var fs = new FileStream("C:/Users/tanmay_pawar/source/repos/CRUDAPI/CRUDAPI/people.json", FileMode.Append))
         using (var sw = new StreamWriter(fs))
        {
           sw.WriteLine(_Student);
        }

}

_Student接收的数据没有被添加到json文件中。

Answer 1

尝尝这个

public IActionResult Add(Students _Student)
{
      if(_Student==null || _Student.students==null)  return null;

    var filePath = @"C:\Users\....\..json";
    var json = File.ReadAllText(filePath);
    
    Students students = JsonConvert.DeserializeObject<Students>(json);
  
    students.students.AddRange(_Student.students);
    
    json=JsonConvert.SerializeObject(students);
    File.WriteAllText(filePath, json);
}

Answer 2

尝试下面的代码：

        [HttpPost]
        public IActionResult Add(Students _Student)
        {
            string jsonresult = JsonConvert.SerializeObject(_Student);

            string path = @"C:\c\people.json";

          
            using(var tw=new StreamWriter(path,true))
            {
                tw.WriteLine(jsonresult.ToString());
                tw.Close();
            }

            return Ok();
}

结果：

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更新更多图片，在现有JSON文件中添加数据.

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