Model being received empty in the controller after post

Question

In my api Asp.Net Core 3.1, I have some controllers that receive viewModel, but when I post, the model arrives empty in the controller.

My ClientViewModel:

public class ClientViewModel
{
    [Key]
    public int Id { get; set; }

    public string Name { get; set; }

    public IEnumerable<OperationViewModel> Operations { get; set; }
}

My Add ClientController:

    [HttpPost]
    public async Task<ActionResult<ClientViewModel>> Add(ClientViewModel clientViewModel)
    {
    //...
    }

Post Json:

  {
    "id": 0,
    "name": "Bradesco",
    "operations":[]
  }

This happens to me on any controller that receives a model, put, post. I don't know what can be.

Welcome to StackOverflow! Could you post the related HTML as well? — Dennis VW, May 01 '20 at 23:33

score 4 · Accepted Answer · answered May 01 '20 at 23:41

You probably don't have ApiController attribute on controller so it tries to parse data in request as form data instead of JSON.

Either specify in client model [FromBody] attribute or add [ApiController] in controller which comes with other fancy functionalities.

source

score 1 · Answer 2 · answered May 01 '20 at 23:35

You need to add the FromBody attribute in the controller method

[HttpPost("/my-endpoint")]
public async Task<ActionResult<ClientViewModel>> Add([FromBody] ClientViewModel clientViewModel)
{
  //...
}

The from body attribute does exactly that. Takes the data and assuming you have the correct model (which you do) binds it to the model

Model being received empty in the controller after post

2 Answers2

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