Route constraints in ASP.NET Core are used to filter out or restrict unwanted data from reaching your controller actions. For a primer on routing in ASP.NET Core, you can refer to my previous article on attribute-based routing versus convention-based routing in ASP.NET Core. This article goes beyond the basics to explore the advanced operations using route constraints.
To work with the code examples provided in this article, you should have Visual Studio 2019 installed in your system. If you don’t already have a copy, you can download Visual Studio 2019 here.
