System.Text.Json Deserialize Fails

Question

With this DTO:

public class QuestionDTO {
    public Guid Id { get; set; }
    public string Prompt { get; set; }
    public List<Answer> Choices { get; set; }

    public QuestionDTO() {

    }

    public QuestionDTO(Question question) {
        this.Id = question.Id;
        this.Prompt = question.Prompt;
        this.Choices = question.Choices;
    }
}

I was getting an error about Unable to Parse without a parameterless constructor. I have since fixed that, but now my objects are de-serialized empty:

using System.Text.Json;
var results = JsonSerializer.Deserialize<List<QuestionDTO>>(jsonString);

The jsonString contains 3 items with the correct data, and the deserialized list contains 3 items, but all the properties are empty.

Answer 1

The new json library is case sensitive by default. You can change this by providing a settings option. Here is a sample:

private JsonSerializerOptions _options = new JsonSerializerOptions { PropertyNameCaseInsensitive = true }

private async Task SampleRequest()
{
    var result = await HttpClient.GetStreamAsync(QueryHelpers.AddQueryString(queryString, queryParams));
    _expenses = await JsonSerializer.DeserializeAsync<List<Common.Dtos.Expenses.Models.Querys.ExpensesItem>>(result, _options);
}