安装完jsonpatch后，postman返回的数据格式从json变成xml了，请问如何让返回值转为json

StartUp内容为

 services.AddControllers(setAction =>
            {
                setAction.ReturnHttpNotAcceptable = true;
                setAction.OutputFormatters.Add(
                    new XmlDataContractSerializerOutputFormatter());
            })
                .AddNewtonsoftJson(setupAction =>
                {
                    setupAction.SerializerSettings.ContractResolver =
                    new CamelCasePropertyNamesContractResolver();
                })
                .AddXmlDataContractSerializerFormatters()
                .ConfigureApiBehaviorOptions(
                setupAction => setupAction.InvalidModelStateResponseFactory = context =>
                    {
                        var problemDetail = new ValidationProblemDetails(context.ModelState)
                        {
                            Type = "无所谓",
                            Title = "数据验证失败",
                            Status = StatusCodes.Status422UnprocessableEntity,
                            Detail = "请看详细说明",
                            Instance = context.HttpContext.Request.Path
                        };
                        problemDetail.Extensions.Add("traceId", context.HttpContext.TraceIdentifier);
                        return new UnprocessableEntityObjectResult(problemDetail)
                        {
                            ContentTypes = { "application/problem+json" }
                        };
                    });