public class Adapter

    {

        static Func<IDictionary<string, object>, Task> _owinApp;

        /// <summary>

        /// 默认构造函数

        /// </summary>

        public Adapter()

        {

            var builder = new AppBuilder();

            var startup = new Startup();

            startup.Configuration(builder);

            _owinApp = builder.Build();

        }

        /// <summary>

        /// *** JWS所需要的关键函数 ***

        /// </summary>

        /// <param name="env">新请求的环境字典，具体内容参见OWIN标准</param>

        /// <returns>返回一个正在运行或已经完成的任务</returns>

        public Task OwinMain(IDictionary<string, object> env)

        {

            //如果为空

            if (_owinApp == null) return null;

            //将请求交给Microsoft.Owin处理

            return _owinApp(env);

        }

    } //end class