Problem Details Model State Behavior

3.Post.ProblemDetails.ProblemDetailsExtensions.cs

public static class ProblemDetailsExtensions
{
	public static IServiceCollection ConfigureProblemDetailsModelState(this IServiceCollection services)
	{
		return services.Configure<ApiBehaviorOptions>(options =>
		{
			options.InvalidModelStateResponseFactory = context =>
			{
				var problemDetails = new ValidationProblemDetails(context.ModelState)
				{
					Instance = context.HttpContext.Request.Path,
					Status = StatusCodes.Status400BadRequest,
					Detail = "Please refer to the errors property for additional details"
				};

				return new BadRequestObjectResult(problemDetails)
				{
					ContentTypes = { "application/problem+json", "application/problem+xml" }
				};
			};
		});
	}
}

4.Post.ProblemDetails.Item.cs

public class Item
{
	[Required]
	public string Name { get; }

	[Range(1, 10)]
	public int Value { get;  }

	public Item(string name, int value)
	{
		Name = name;
		Value = value;
	}
}

5.Post.ProblemDetails.ValuesController.cs

[Route("api/[controller]")]
[ApiController]
public class ValuesController : ControllerBase
{
	[HttpPost]
	public ActionResult Post(Item item)
	{
		return Ok();
	}
}

6.Post.ProblemDetails.Startup.cs

public class Startup
{
	public void ConfigureServices(IServiceCollection services)
	{
		services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
		services.ConfigureProblemDetailsModelState();
	}
	
	//... código omitido
}