MVC - Action passing to wrong controller - asp.net-mvc

Question

I have a form that submits a SearchByUserViewModel (containing only string ID) to asp-controller="Home" asp-action="SubmitUserSearch". The form is a single textbox and a submit button. SubmitUserSearch retrieves the ID from the model and returns RedirectToAction("EventListByArtist", m.ID).
EventListByArtist, in the Home controller, is as follows:
public IActionResult EventListByArtist(string ID)
{
var events = context.Events.ToList();
ViewBag.genres = context.Genres.ToList();
ViewBag.artists = context.Artists.ToList();
ViewBag.ID = ID;
return View("EventList", events);
}
SubmitUserSearch redirects to EventListByArtist:
public IActionResult SubmitUserSearch(SearchByUserViewModel m)
{
return RedirectToAction("EventListByArtist", m.ID);
}
The SearchByUserViewModel contains only the ID field.
However, something in the middle breaks, and instead of being directed to (for example input "Bob") Home/EventListByArtist/Bob, I am directed to Bob/EventListByArtist, which does not exist. What is causing this redirect? The form has been pasted below.
<form asp-controller="Home" asp-action="SubmitUserSearch" asp-route-returnurl="#ViewData["ReturnUrl"]" class="form-horizontal">
<div asp-validation-summary="All" class="text-danger"></div>
<div class="form-group">
<label asp-for="ID" class="col-md-2 control-label"></label>
<div class="col-md-10">
<input asp-for="ID" class="form-control" id="artistInput" />
<span asp-validation-for="ID" class="text-danger"></span>
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" class="btn btn-default" value="Search" />
</div>
</div>
</form>
The project routes declaration (in Startup.cs) is as follows:
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});

Answer 1

In your SubmitUserSearch() POST method the value of m.ID is a string ("Bob") so you RedirectToAction() translates to
return RedirectToAction("EventListByArtist", "Bob");
which is using this overload where the 2nd parameter is the name of the controller, hence it generates /Bob/EventListByArtist.
You need to use this overload where the 2nd parameter is object
return RedirectToAction("EventListByArtist", new { id = m.ID });