JSON 返回的是 ASP.NET 中的空 CORE WEB API

Question

I am trying to learn ASP.NET Web API. I have designed the code something like, when a request(GET) comes to the controller, SP is triggered and the data is converted from datasets to data.table and returned in JSON format.The problem is when I try to return the JSON the Response becomes empty.

C# Code:

    [HttpGet]
    public IActionResult GetTodoItem()
    {
        try
        {
            DbConnect dbConnect = new DbConnect();
            DataSet ds = dbConnect.ExecuteSP2("View_Contacts");
            string results = dbConnect.DataTableToJSONWithJSONNet(ds.Tables[0]);
            dynamic json1 = JsonConvert.DeserializeObject(results);
            return this.Ok(json1);
        }
        catch (Exception ex)
        {
        return StatusCode(500,ex.Message);
        }

    }

The Response:

Sample JSON Required:

[
  {
    "Contact": 6860,
    "Title_Movie": "Ayan",
    "Email_": "",
    "PhoneNumber": null,
    "Job": null,
    "Fax": null,
    "Picture_maxi": "",
    "Type": 2,
    "Company_Id": null,
    "School_Id": null,
    "Theatre_Id": null,
    "FirstName": "Stuart",
    "LastName": "",
    "PreferredName": null,
    "Status": 9,
    "Meter_Id": null,
    "Car_Id": null,
    "Business_Id": null
  }]

How can I return this sample json. Thanks

Answer 1

1. Data Tables have an extension method to return them as IEnumerable.
2. If you give the Ok Action an IEnumerable it will return a JSON Object.

Following this, you can change your method to be like this in order to receive the required output:

[HttpGet]
    public IActionResult GetTodoItem()
    {
        try
        {
            DbConnect dbConnect = new DbConnect();
            DataSet ds = dbConnect.ExecuteSP2("View_Contacts");
            IEnumerable results = ds.Tables[0].AsEnumerable();
            return this.Ok(results);
        }
        catch (Exception ex)
        {
        return StatusCode(500,ex.Message);
        }

    }