How to Consume an API in ASP.NET Core? - json

Question

I need to consume an API in my MVC project. the actions in API are secured, So you need to access a token (JWT) to consume it. I face an error every time I try to deserialize the response into the model (Player). It says *Could not cast or convert from System.String to MyMVC.Models.Player*
When I run a debugger, the piece of code including deserialization is in red in the internal server error page.
Here is the action in API
[HttpGet]
[Authorize]
public ActionResult<List<Player>> GetAllPlayers()
{
var players = _applicationDbContext.Players.OrderBy(p => p.Name).Select(p=> p.Name).ToList();
return Ok(players);
}
This is the action in the MVC project
public async Task<IActionResult> GetPlayers()
{
var token = HttpContext.Session.GetString("Token");
List<Player> players = new List<Player>();
var request = new HttpRequestMessage(HttpMethod.Get, "http://localhost:53217/api/player");
var client = _clientFactory.CreateClient();
request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
HttpResponseMessage response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead);
if(response.StatusCode == System.Net.HttpStatusCode.OK)
{
var strResponse = await response.Content.ReadAsStringAsync();
players = JsonConvert.DeserializeObject<List<Player>>(strResponse);
}
return View(players);
}

Answer 1

Sami Kuhmonen 's comment is right.
var players = _applicationDbContext.Players.OrderBy(p => p.Name).Select(p=> p.Name).ToList();
From here we can get name list not player list.
Name list contain string name. Player list contain object player1 {name="xx",age="xx"}
But
List<Player> players = new List<Player>();
var strResponse = await response.Content.ReadAsStringAsync();
players = JsonConvert.DeserializeObject<List<Player>>(strResponse);
here we need player list contain object players .
You can use below code in your API to get the playerlist.
var players = _applicationDbContext.Players.ToList();
I reproduce your problem. Then I use that method to solve it.
Update
Create a new class User contain the property that you want.
public class User
{
public int Id { get; set; }
public string Name { get; set; }
}
Then use the below code
var players = _applicationDbContext.Players.Select (P=>new User { Name=P.Name, Id=P.Id} ).ToList();
In mvc change List<Player> players = new List<Player>(); to
List<User> players = new List<User>();
Result: