.NET Core：多样的宿主

　　 .net core 可以以以下方式作为宿主运行：

1. iis
2. 控制台
3. windows服务

　　运行启动代码：

        public static void main(string[] args)

        {

            try

            {

                logcenter.info("系统启动");

                loadconfig();

                bool isservice = !(debugger.isattached ||  args.contains("--console"));

                if (isservice)

                {

                    createwebhostbuilder(args).build().runasservice();

                }

                else

                {

                    createwebhostbuilder(args).build().run();

                }

            }

            catch (exception ex)

            {

                logcenter.error(ex);

            }

        }