使用ASP.NET Core从MS EntityFrameworkCore中的Json文件获取记录

Question

There is a JSON file on the desktop. I want this API to grab that file and then add all the records within that file ready to display and for requests.

right now it is importing everything from the JSON file into an object but I cannot go any further.

I am new to APIs and ASP.Net

Can anyone help me please.

Thank you

[Route("api/[controller]")]
public class TodoController : Controller
{

    private readonly TodoContext _context;
    public TodoController(TodoContext context)
    {

        _context = context;
        if (_context.TodoItems.Count() == 0)
        {
            string allText = System.IO.File.ReadAllText(@"C:\Users\Alex\Desktop\Prog\A.json");
            object jsonObject = JsonConvert.DeserializeObject(allText);

            int x = jsonObject.
            _context.TodoItems.Add(new TodoItems { Id = '1', Name = "Item1", IsComplete = false,  });
            _context.SaveChanges();
        }
    }

Answer 1

You have written the code in constructor, its not a good approach to write in that way. Probably what you can do is add GET/POST method depending on your requirement. I have made a GET api call to execute your case.Please check below code snippet.

            [Produces("application/json")]
            [Route("api/TodoController")]
            public class TodoControllerController : Controller
            {
                private readonly TodoContext _context

                public void Get()
                {
                    _context = context;
                    if (_context.TodoItems.Count() == 0)
                    {
                        string allText = System.IO.File.ReadAllText(@"C:\Users\Alex\Desktop\Prog\A.json");
                        object jsonObject = JsonConvert.DeserializeObject(allText);

                        int x = jsonObject.
                        _context.TodoItems.Add(new TodoItems { Id = '1', Name = "Item1", IsComplete = false, });
                        _context.SaveChanges();
                    }
                }
            }

Answer 2

[Produces("application/json")]
[Route("api/ToDo")]
public class ToDoController : Controller
{
    private TodoContext _context;
    public TodoController(TodoContext context)
    {
        _context = context;
    }

    [HttpPost]
    [Route("Upload")]
    public HttpResponseMessage UploadData()
    {
        try
        {
            if (_context.TodoItems.Count() == 0)
            {
                string allText = System.IO.File.ReadAllText(@"C:\Users\Alex\Desktop\Prog\A.json");
                object jsonObject = JsonConvert.DeserializeObject(allText);

                int x = jsonObject.
                _context.TodoItems.Add(new TodoItems { Id = '1', Name = "Item1", IsComplete = false, });
                _context.SaveChanges();
            }
        }
        catch (Exception ex)
        {
            return new HttpResponseMessage(HttpStatusCode.InternalServerError);
        }
    }
}

Whenever a service call comes for the controller. On that time It will invoke the constructor. Instead of this, if we move the code to a separate method and invoke this method when required. It will increase the performance and also remove any calls to invoke the constructor unwantedly.