“System.Web.Routing.SignalRRouteExtensions.MapConnection<T>(System.Web.Routing.RouteCollection, string, string)”已过时:“Use IAppBuilder.MapSignalR<TConnection> in an Owin Startup class. See http://go.microsoft.com/fwlink/?LinkId=320578 for more details.”
http://www.asp.net/signalr/overview/signalr-20/getting-started-with-signalr-20/upgrading-signalr-1x-projects-to-20