asp.net core mvc application form post with query string parameters

Question

I am building a login form in .net core mvc. Below is my login form

<form class="c-form" asp-controller="Account"
  asp-action="Login">
<div class="form-group">
    @Html.TextBoxFor(m => m.Username, new { @class = "form-control c-input", placeholder = "Username" })
</div>

<div class="form-group">
    @Html.PasswordFor(m => m.Password, new { @class = "form-control c-input", placeholder = "Password" })
</div>
<div class="help-text help-text-error">
    @Html.ValidationMessage("UserNamePasswordInvalid")
</div>
<div class="">
    <button type="submit" class="btn-c btn-teal login-btn width100">Login</button>
</div>

If a form is posted with incorrect credentials user stays on the page with validation failure messages.

Login page also has return url in query string, when the form is posted query string parameters are lost. What is the correct way of doing form post in .net core.

What do you mean by 'are lost'? How does your controller look? Posting a form and query string parameters are not really related to each other, they're just part of the URL that sends a POST request to the server. — Henk Mollema
– Henk Mollema, Commented Oct 27, 2016 at 20:25
When the Account/Login route is loaded for first time there is query string parameter. when the form is submitted query string url no longer exists. If I remember correctly previous version of mvc used to retain the query string parameter when using Html.BeginForm helper methods. — Yousuf
– Yousuf, Commented Oct 27, 2016 at 20:50

connectedsoftware · Accepted Answer · 2016-10-27 20:47:47Z

10

To keep the query string when the form is submitted write a hidden field in the form containing the query string contents:

@Html.Hidden("returnUrl",@Request.QueryString)

Make sure your controller action that handles the post request has a parameter called returnUrl (or the model that is passed as a parameter has that property) and the model binding will take care of passing it through to the controller. Then in the controller action if the login is successful use that data to redirect accordingly.

edited Oct 27, 2016 at 20:47

answered Oct 27, 2016 at 20:26

connectedsoftware

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1 Comment

Roe Over a year ago

I wanted to add that this didn't directly work with: @Request.QueryString. So if Request Doesn't exist you might want to try: @Context.Request.QueryString, this worked for me

mirko federico · Accepted Answer · 2018-07-19 14:36:59Z

1

I know that it's passed a lot of time, but I found a better solution for this problem.

I added a parameter called QueryString in Model as Dictionary string

in view, in tag form, add

So at this time, the post have the parameters in query string<form asp-all-route-data="@Model.QueryString"

answered Jul 19, 2018 at 14:36

mirko federico

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1 Comment

Doug Dekker Over a year ago

Including a dictionary in every view model seems impractical but minimally declaration and server side code to retrieve values is necessary to even attempt.

Doug Dekker · Accepted Answer · 2020-11-13 13:24:44Z

0

Your controller/PageModel method must contain all parameters that you need to persist. Something like this:

public async Task<IActionResult> OnPostAsync(string returnUrl = null)

answered Nov 13, 2020 at 13:24

Doug Dekker

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1 Comment

InteXX Over a year ago

That's for a Razor Pages app. In MVC we don't have the OnPostAsync concept.

Ali · Accepted Answer · 2022-10-26 07:33:36Z

0

If the controller and action pair for getting and posting the form is the same, than it is simpler to just delete asp-controller and asp-action attributes from the form opening tag, leaving your like this:

<form class="c-form" method="post">

answered Oct 26, 2022 at 7:33

Ali

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