Persisting QueryString parameters when validation error occurs

Question

I have an Upload File form, the file has (Name nvarchar, FileData varbinary(max))

Name and FileData are mandatory fields

For some reason, validation of FileData (using Required attribute) is not working, so I searched the internet and found an Html Helper extension method which renders a Input(file) and can validate it.

But the problem is that when I add the error to the model state and return View() the returnUrl which was in the query string is gone, how can I persist returnUrl and/or some other query string variables in such case?

You may notice, I can't use RedirectToAction, I have to return View() so that the validation summary can show the error (and hopefully, the Name field persists its value).

Jamie Dixon · Accepted Answer · 2011-06-27 10:03:11Z

2

The short answer is that you can't return a View in the way you'd like and also retain the querystring parameters.

What I would do is store the return URL as part of the view model.

This way when you return View() you'll have access to the return URL in the model you pass.

answered Jun 27, 2011 at 10:03

Jamie Dixon

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1 Comment

Ken D Over a year ago

Good solution, didn't try it yet but can see it works, and when I have many Url parameters they all can be part of the view model, thanks.

SharpC · Accepted Answer · 2018-07-05 14:41:00Z

0

This is actually possible (credit to Ivan Korytin). You have to put the parameters as part of the form action (I've enhanced it to simply repeat the query string):

<form action="@Url.Action("CreateEntity", "Employee")?@(Request.QueryString)"
  enctype="multipart/form-data" method="POST">

When you perform the following the query string (and GET parameters) are now preserved:

[HttpPost]
public ActionResult MyAction(MyAction model)
{
    if (!ModelState.IsValid)
    {
        return View(model);
    }

answered Jul 5, 2018 at 14:41

SharpC

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