.net core post自带的json序列化转换出错 post参数为null

            //配置Mvc + json 序列化
            services.AddMvc(options => { options.EnableEndpointRouting = false; })
                    .SetCompatibilityVersion(CompatibilityVersion.Version_3_0)
                        .AddNewtonsoftJson(options =>
                        {
                            options.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;
                            options.SerializerSettings.DateFormatString = "yyyy-MM-dd HH:mm";
                        });