ASP.NET MVC Url.Action adds current route values to generated url

Question

I have seen this question a couple of times here in SO but none of them with any acceptable answer:

ASP.NET MVC @Url.Action includes current route data
ASP.NET M

Answer 1

Url.Action will reuse the current request parameters, if you do not explicitly set them. It is by design in outbound url-matching algorithm. When looking for the route data parameters in a process of generating url, parameters are taken from:

1) explicitly provided values

2) values from the current request

3) defaults

In the order I specified above.

Outbound matching algorithm for routes is complicated, so it is good practice to explicitly set all parameters for request, as you did in your example