.net core MVC JSON 序列化属性一直是小写的解决方案

中设置（加上最后一行代码）：

        public void ConfigureServices(IServiceCollection services)
        {
            <CookiePolicyOptions>(options =>
            {
                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                // = context => true;
                 = ;
            });

            //Session 保存到内存
            ();
            ();

            ().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
            ().AddJsonOptions(options => {  = new DefaultContractResolver(); });
        }