How to pass a string as a parameter in Action

Question

I need to pass as a parameter a string where it returns all items that have the same name. Here he is returning Null.

With Id it works perfectly.

[HttpGet, ActionName("Search")]
public async Task<IActionResult> Search([FromQuery] string hosts)
{
    if (hosts == null)
    {
        return NotFound();
    }
    return View(_context.Histories.Where(x => x.Host == hosts).ToList());
}

Answer 1

You need to define where this value comes from.

In case of a GET request, it may come from the route:

[HttpGet("{hosts}"), ActionName("Search")]
public async Task<IActionResult> Search([FromRoute] string hosts)
{
    ...
}

In this case the call would be: http://url-base/Search/valor-hosts.

Or you can receive it via querystring

[HttpGet, ActionName("Search")]
public async Task<IActionResult> Search([FromQuery] string hosts)
{
    ...
}

The call would be: http://url-base/Search?hosts=valor-hosts.

It is also possible to receive a value of a header, but I doubt it’s useful now.

---

According to his comment, the same problem is in the assembly of view. Here’s an example of how to do.

@{
    var querystringValues = new Dictionary<string, string>
    {
        { "hosts", "teste-teste" }
    };
}

<a asp-controller="Histories" asp-action="Search"
   asp-all-route-data="querystringValues">Clique aqui</a>