ASP.NET 5 is an open source web application development framework for building modern web applications. It is built on the .NET Core runtime and you can take advantage of it to build and run applications on Windows, Linux, and the Mac. ASP.NET Core MVC is a lightweight, open source, highly testable framework built on top of the ASP.NET Core runtime and is available as part of ASP.NET 5.
When working in ASP.NET Core MVC, you might often need to handle actions that are not known at development time. This article talks about how you can handle unknown action methods in ASP.NET Core 5. The code examples are given in C#.