.NET 5.0 WebApi中修改输出 json 数据大小写规则

        public void ConfigureServices(IServiceCollection services)
        {

            services.AddControllers().AddJsonOptions(options =>
            {
                //默认为json按驼峰式输出
                //options.JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;

                //json按大小写原样输出
                options.JsonSerializerOptions.PropertyNamingPolicy = null;
            });
        }