AspNetCore MVC - return RedirectToAction is getting ignored

Question

I have an action as below:

[HttpGet]
public IActionResult SendEmailVerificationCode(int userId)
{
    SpaceUser user = userManager.FindByIdAsync(userId).Result;
    bool taskComleted = SendEmailVerificationLink(userId).IsCompleted;
    if (taskComleted)
    {
        AddToErrorData(InfoMessages.EmailVerificationLinkSent_Params, user.Email);
        return RedirectToAction(nameof(HomeController.Index), "Home");
    }
    else
    {
        return RedirectToAction("EmailNotConfirmed", new { userId = user.Id });
    }
}

When I make the code jump into the else block (when debugging) it makes the redirection to EmailNotConfirmed action, which is in the same controller. But it doesn't redirect to HomeController's Index action. Instead, the browser stays at Account/SendEmailVerificationCode and displays a blank page.

HomeController.Index is as below:

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

I tried these:

• In the beginning SendEmailVerificationCode action was async but HomeController.Index wasn't. So I declared them both as async.
• Then I deleted the async declaration from both of them.
• I tried return RedirectToAction("Index", "Home");.
• SendEmailVerificationCode had HttpPost attribute; I changed it to HttpGet.

How can I make the redirection to an action in a different Controller?
Any help would be appreciated.

P.S.: I have been doing research about this issue for a while now and I've read the solutions for questions such as:
MVC RedirectToAction is not working properly
RedirectToAction gets ignored

But none of these or the questions regarding the action not being redirected after an ajax request have helped me.

Thanks.

Answer 1

I figured the problem by adding some logging into the application. It turns out that the actual problem was being hidden.

I was using TempData to store the customized error messages and I was utilizing it via the AddToErrorData function I had displayed in the question.

In AspNetCore, Serializable attribute has disappeared along with ISerializable interface. Therefore, TempData was unable to serialize my custom IList object list.

When I changed the TempData[ConstantParameters.ErrorData] = _errorData; to TempData[ConstantParameters.ErrorData] = JsonConvert.SerializeObject(_errorData); the redirection problem was solved.

For reference: I also had to change the TempData retrieving line as: _errorData = JsonConvert.DeserializeObject<ErrorDataList>(TempData[ConstantParameters.ErrorData].ToString());