URL.Action includes id when constructing URL

Question

I'm using ASP.Net MVC. Here's my code snippets from a controller named Course:

public ActionResult List(int id) {     var viewmodel.ShowUrl = Url.Action("Show", "Course");       ... }  public ActionResult Show(int id) {   ... } 

viewmodel.ShowUrl picks up whatever the value is of the "id" parameter. So viewmodel.ShowUrl becomes "/Course/Show/151" (value of id is 151); I want to be able to set the id part on the client based on user interaction. I want the value of viewmodel.ShowUrl to be "/Course/Show".

This seems like a bug to me. I'm not telling Url.Action to include an id value. It's doing it on its own. If I want to set the id value then I would do something like this:

var viewmodel.ShowUrl = Url.Action("Show", "Course", new {id = somevalue}); 

So, how do you prevent MVC from adding the id value? I can hardcode viewmodel.ShowUrl to "/Course/Show" but that seems to be a kludgy solution. Thanks.

Answer 1

Just came across the same problem and so you know, you can also just use an empty string:

@Url.Action("Show", "Course", new { id = "" }) 

Answer 2

I know this is old, but I found this first, but didn't like any of these solutions, so I kept looking and found https://stackoverflow.com/a/19110921/1130636.

You can use UrlParameter.Optional to solve this problem

Url.Action("Show", "Course", new { id = UrlParameter.Optional })