I'm working on upgrading a .NET Framework 4.8 app to .NET Core 8.

Currently experiencing an issue where both Html.BeginForm and the form helper tag sometimes render the wrong action.

In Framework 4.8, I have a form like this:

<form method="post" action="/Controller/Action?paramOne=123">
  ...
</form>

In Core 8, the same form renders like this instead:

<form method="post" action="[paramOne, 123]">
  ...
</form>

I get this result with Html.BeginForm and also with <form asp-controller="Controller" asp-action="Action" method="post">.

What might be causing this result?

I'm working on upgrading a .NET Framework 4.8 app to .NET Core 8.

Currently experiencing an issue where both Html.BeginForm and the form helper tag sometimes render the wrong action.

In Framework 4.8, I have a form like this:

<form method="post" action="/Controller/Action?paramOne=123">
  ...
</form>

In Core 8, the same form renders like this instead:

<form method="post" action="[paramOne, 123]">
  ...
</form>

I get this result with Html.BeginForm and also with <form asp-controller="Controller" asp-action="Action" method="post">.

What might be causing this result?

• -core
• asp-core-8

• Note: I understand that querystring params are less idiomatic compared to RESTful routes, but if it's possible to get things working with the querystrings for now, I'm currently willing to choose the quick fix over correctness – asfallows Commented 21 hours ago

1 Answer 1

In Asp core MVC, to add parameters in the <form> tag, you could use the asp-route-<Parameter Name> attribute, code like this:

<form asp-action="Create" asp-route-paramOne="123" method="post">

In addition, if you want to use the action attribute directly, you can use the following method.

  <form action="/Home/Create?paramOne=123" method="post">

Note: When use the action attribute, in the controller, you have to use the HttpGet and HttpPost verb together.

public class HomeController : Controller
{
    private readonly ILogger<HomeController> _logger;

    public HomeController(ILogger<HomeController> logger)
    {
        _logger = logger;
    }

    public IActionResult Index()
    {
        return View();
    }
    [HttpGet]
    public IActionResult Create()
    {

        return View();
    }
    [HttpPost]
    [IgnoreAntiferyToken]
    public async Task<IActionResult> Create(
    [Bind("EnrollmentDate,FirstMidName,LastName")] Student student, int paramOne)
    {
        //insert into database.
        return View(student);
    }