I am developing a layered .NET project with API, BLL, DAL, and UI layers. The UI layer calls the API using a generic API repository built with HttpClient.

My project structure is roughly:

Core
 └─ DataAccess
     └─ Repository
         └─ ApiRepositoryBase.cs

Kutuphane.API
 └─ Controllers
     └─ DilController.cs

Kutuphane.Model
 └─ Entity
     └─ Dil.cs

Kutuphane.UI
 └─ Services

API Response

The API returns the following JSON:

{
  "data": [
    {
      "dilId": 1,
      "dilAdi": "Türkçe",
      "dilKodu": "tr",
      "aktifMi": true
    },
    {
      "dilId": 2,
      "dilAdi": "İngilizce",
      "dilKodu": "en",
      "aktifMi": true
    }
  ],
  "message": null,
  "isSuccess": true
}

Entity

public class Dil : IEntity
{
    public short DilId { get; set; }
    public string DilAdi { get; set; }
    public string DilKodu { get; set; }
    public bool AktifMi { get; set; } = true;
}

Generic API Repository Method

public async Task>> GetListAsync(string endpoint, Expression>? filter = null)
{
    try
    {
        using var httpClient = new HttpClient();
        httpClient.BaseAddress = new Uri(_baseUrl.Trim());

        httpClient.DefaultRequestHeaders.Authorization =
            new AuthenticationHeaderValue("Bearer", _token);

        var response = await httpClient.GetAsync($"api/{endpoint}");

        if (!response.IsSuccessStatusCode)
            return new ErrorDataResult>(response.ReasonPhrase ?? "Api error");

        var data = await response.Content.ReadFromJsonAsync>();

        if (data == null)
            return new ErrorDataResult>("Deserialization failed");

        if (filter != null)
        {
            var compiledFilter = filter.Compile();
            data = data.Where(compiledFilter).ToList();
        }

        return new SuccessDataResult>(data);
    }
    catch (Exception ex)
    {
        return new ErrorDataResult>(ex.Message);
    }
}

Exception

System.Text.Json.JsonException:
The JSON value could not be converted to
System.Collections.Generic.List.
Path: $ | LineNumber: 0 | BytePositionInLine: 1.

The exception occurs on this line:

var data = await response.Content.ReadFromJsonAsync>();

Question

Since the API response contains the list inside a data property rather than being a root JSON array, what is the correct way to deserialize this response in a generic repository scenario?