How to bind fetch body to controller action object parameter in ASP.NET Core

Question

I am trying to use fetch from the client side to request a chat session. In my controller I am attempting to capture (or bind) the request body to a model. Then, my controller is using the model to make an API call using RestSharp. The problem is that my parameter is not getting the values of the request body.

Here is how it looks:

// The fetch from the view
const requestBody = buildRequestSession()
var url = '@Url.Action("RequestSession", "Sdk")'
const response = await fetch(url, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json;charset=UTF-8',
            },
            body: JSON.stringify(requestBody)
        })

This is the payload of the fetch

// Controller action
[HttpPost]
public async Task<IActionResult> RequestSessionAsync([FromBody]RequestSession requestSession)
{
    RestRequest request = new RestRequest("sessions");
    RestResponse response = await _restClient.ExecuteGetAsync(request);

    RequestSessionResponse? sessionResponse = JsonConvert.DeserializeObject<RequestSessionResponse>(response.Content!);

    return Json(sessionResponse);
}

This is the result of the fetch:

// model for my controller action parameter
public record RequestSession
{
    [JsonProperty("businessUnitName")]
    internal string BusinessUnitName { get; set; } = string.Empty;
    [JsonProperty("caption")]
    internal string Caption { get; set; } = string.Empty;
    [JsonProperty("contactData")]
    internal ContactData[]? ContactData { get; set; }
    [JsonProperty("customerName")]
    internal string CustomerName { get; set; } = string.Empty;
    [JsonProperty("destination")]
    internal string Destination { get; set; } = string.Empty;
    [JsonProperty("language")]
    internal string Language { get; set; } = string.Empty;
    [JsonProperty("priority")]
    internal int Priority { get; set; }
    [JsonProperty("source")]
    internal string Source { get; set; } = string.Empty;
}

My setup: ASP.NET Core 6 MVC web application using Visual Studio 2022.

I understand this may appear to be a duplicate question, however, none of the suggestions in the following posts have resolved my issue.

Similar question

Another similar question

I have restructured my fetch, model, and controller action in various ways to no avail. All of the suggestions mentioned in other SO posts have not worked. Any explanation on how this is suppose to work will be appreciated.

What is the request body and what is the response body? Does the response http header status a 200 OK or and Error? — jdweng
– jdweng, Commented Apr 11, 2023 at 16:19
@RicardoPeres, properties are internal to keep scope internal to my application. I will try making them public, but shouldn't it still work either way? — SpookyBooky
– SpookyBooky, Commented Apr 11, 2023 at 18:49
@RicardoPeres, that was the issue. If you want to provide an answer and explain why this is the case I will accept it. I guess I'm confused now on why it binds when the fields are public but not when they are internal. — SpookyBooky
– SpookyBooky, Commented Apr 11, 2023 at 19:12

Ricardo Peres · Accepted Answer · 2023-04-12 08:31:28Z

1

The properties need to be public, otherwise, the binder won't find them.

answered Apr 12, 2023 at 8:31

Ricardo Peres

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