Here's everything you need to write code for the Session object in ASP.NET Core -- including why you can't expect to migrate your existing ASP.NET MVC application to ASP.NET MVC Core (though Peter has ...

After installing SignalR, add the necessary ASP.NET MVC routing rules for the Hub API. Open up the App_Start\RouteConfig.cs file and add a using statement for the Microsoft.AspNet.SignalR namespace.