ASP.NET Core Web API (Native AOT) project fail to serialize the object to JSON

[Scythemen]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Environment:
Visual Studio Community 2022 17.12.3
Win10 + .NET SDK 8

I created an ASP.NET Core Web API (Native AOT) project in Visual Studio using .NET 8. The minimal API endpoints below worked as expected:

using System.Text.Json.Serialization;

namespace WebApplication1
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var builder = WebApplication.CreateSlimBuilder(args);

            builder.Services.ConfigureHttpJsonOptions(options =>
            {
                options.SerializerOptions.TypeInfoResolverChain.Insert(0, AppJsonSerializerContext.Default);
            });

            var app = builder.Build();

            var sampleTodos = new Todo[] {
                new(1, "Walk the dog"),
                new(2, "Do the dishes", DateOnly.FromDateTime(DateTime.Now)),
                new(3, "Do the laundry", DateOnly.FromDateTime(DateTime.Now.AddDays(1))),
                new(4, "Clean the bathroom"),
                new(5, "Clean the car", DateOnly.FromDateTime(DateTime.Now.AddDays(2)))
            };

            var todosApi = app.MapGroup("/todos");
            todosApi.MapGet("/", () => sampleTodos);
            todosApi.MapGet("/{id}", (int id) =>
                sampleTodos.FirstOrDefault(a => a.Id == id) is { } todo
                    ? Results.Ok(todo)
                    : Results.NotFound());

            app.Run();
        }
    }

    public record Todo(int Id, string? Title, DateOnly? DueBy = null, bool IsComplete = false);

    [JsonSerializable(typeof(Todo[]))]
    internal partial class AppJsonSerializerContext : JsonSerializerContext
    {

    }
}

After moving the endpoints to TodosController.cs and configuring the JSON serializer in a separate file JsonTypeMetaData.cs, I encountered the following exception:

NotSupportedException: JsonTypeInfo metadata for type 'WebApplication1.Todo[]' was not provided by TypeInfoResolver of type '[]'. 
If using source generation, ensure that all root types passed to the serializer have been annotated with 'JsonSerializableAttribute', along with any types that might be serialized polymorphically.

TodosController.cs:

// TodosController.cs
using Microsoft.AspNetCore.Mvc;

namespace WebApplication1.Controllers
{
    [ApiController]
    [Route("api/[controller]")]
    public class TodosController : ControllerBase
    {
        private static readonly Todo[] sampleTodos = new Todo[] {
            new(1, "Walk the dog"),
            new(2, "Do the dishes", DateOnly.FromDateTime(DateTime.Now)),
            new(3, "Do the laundry", DateOnly.FromDateTime(DateTime.Now.AddDays(1))),
            new(4, "Clean the bathroom"),
            new(5, "Clean the car", DateOnly.FromDateTime(DateTime.Now.AddDays(2)))
        };

        [HttpGet]
        public IActionResult GetTodos()
        {
            return Ok(sampleTodos);
        }

        [HttpGet("{id}")]
        public IActionResult GetTodoById(int id)
        {
            var todo = sampleTodos.FirstOrDefault(a => a.Id == id);
            return todo is not null ? Ok(todo) : NotFound();
        }
    }
}

JsonTypeMetaData.cs:

// JsonTypeMetaData.cs

using System.Text.Json;
using System.Text.Json.Serialization;

namespace WebApplication1
{
    public static class JsonTypeMetaData
    {
        public static void ConfigureJsonTypeMetaDatas(this IServiceCollection services)
        {
            services.ConfigureHttpJsonOptions(options =>
            {
                options.SerializerOptions.TypeInfoResolverChain.Insert(0, TodoJsonSerializerContext.Default);
            });
        }
    }


    public record Todo(int Id, string? Title, DateOnly? DueBy = null, bool IsComplete = false);

    [JsonSerializable(typeof(Todo[]))]
    internal partial class TodoJsonSerializerContext : JsonSerializerContext
    {
    }

}

Program.cs:

namespace WebApplication1
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var builder = WebApplication.CreateSlimBuilder(args);

            builder.Services.ConfigureJsonTypeMetaDatas();   //   JsonTypeMetaData.cs

            builder.Services.AddControllers();

            var app = builder.Build();

            app.MapControllers();

            app.Run();
        }
    }

}

WebApplication.csproj

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <InvariantGlobalization>true</InvariantGlobalization>
    <PublishAot>true</PublishAot>
  </PropertyGroup>

</Project>

I tried a similar solution (#59128), but it didn't work for me. Any help would be greatly appreciated.

Expected Behavior

No response

Steps To Reproduce

The mini project:
WebApplication1.zip

Exceptions (if any)

No response

.NET Version

dotnet 8.0.404

Anything else?

No response

[martincostello]

ConfigureHttpJsonOptions is only for Minimal APIs. For MVC you need to configure the Microsoft.AspNetCore.Mvc.JsonOptions class instead:

services.AddMvc().AddJsonOptions(...)

[martincostello]

Also note that MVC does not support native AOT.

[Scythemen]

Thank you.

[olga-nosova-bl]

ConfigureHttpJsonOptions is only for Minimal APIs. For MVC you need to configure the Microsoft.AspNetCore.Mvc.JsonOptions class instead:

services.AddMvc().AddJsonOptions(...)

Hello,

I have an api project and I tried this approach and the approach with services.AddControllers().AddJsonOptions(...) as well. Both don't work.

This is my code:

Program.cs
`var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers().AddJsonOptions(
static options =>
options.JsonSerializerOptions.TypeInfoResolverChain.Insert(0, MyJsonContext.Default));

// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
app.UseSwagger();
app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();
`

WeatherForcast.cs

`using System.Text.Json.Serialization;
using webApi;

namespace webApi
{
public class WeatherForecast
{
public DateOnly Date { get; set; }

    public int TemperatureC { get; set; }

    public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);

    public string? Summary { get; set; }
}

}

[JsonSourceGenerationOptions(
PropertyNamingPolicy = JsonKnownNamingPolicy.SnakeCaseLower,
GenerationMode = JsonSourceGenerationMode.Metadata)]
[JsonSerializable(typeof(WeatherForecast))]
[JsonSerializable(typeof(IEnumerable))]
[JsonSerializable(typeof(WeatherForecast[]))]
internal partial class MyJsonContext : JsonSerializerContext { }
`

controller

`using Microsoft.AspNetCore.Mvc;

namespace webApi.Controllers
{
[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
private static readonly string[] Summaries = new[]
{
"Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
};

    private readonly ILogger<WeatherForecastController> _logger;

    public WeatherForecastController(ILogger<WeatherForecastController> logger)
    {
        _logger = logger;
    }

    [HttpGet(Name = "GetWeatherForecast")]
    public IEnumerable<WeatherForecast> Get()
    {
        return Enumerable.Range(1, 5).Select(index => new WeatherForecast
        {
            Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
            TemperatureC = Random.Shared.Next(-20, 55),
            Summary = Summaries[Random.Shared.Next(Summaries.Length)]
        })
        .AsEnumerable();
    }
}

}
`

progect file

`

net8.0 enable enable false `

output

Still camel case, but I want snake case.