将表单数据传递到确认视图

Question

I have a simple form that I show to the user with the Create action. After they have submitted the form, I show them a new Confirmation view, where they can enter their e-mail address to be sent a copy of the form.

In order to fill out the e-mail properly, I need to retain all of the data from the MonthlyReport form that they just completed. However, I am finding it difficult to preserve that report data across Get and Post requests from the Confirmation view.

When I post from the Confirmation page, I find that my ConfirmationViewModel no longer contains a valid report.

    [HttpPost]
    public ViewResult Create(MonthlyReport model)
    {
        if (ModelState.IsValid)
        {
            var modelDto = _factory.CreateDataTransferObject(model);
            _repository.Submit(modelDto);

            ModelState.Clear();

            return Confirmation(model);
        }

        return Create();
    }

    [HttpGet]
    public ViewResult Confirmation(MonthlyReport model)
    {
        var confirmation = new ConfirmationViewModel();
        confirmation.Report = model;
        return View("Confirmation", confirmation);
    }

    [HttpPost]
    public ViewResult Confirmation(ConfirmationViewModel model)
    {
        if (ModelState.IsValid)
        {
            try
            {
                var email = _mailer.MonthlyReportEmail(model);
                email.DeliverAsync();
            }
            catch (Exception error)
            {
                Trace.WriteLine(String.Format("Sending mail failed: {0}", error));
            }

            TempData["message"] = "Confirmation e-mail sent.";
        }
        return View("Confirmation");
    }

Here is the Confirmation view:

@model Domain.Entities.ConfirmationViewModel

@{
    ViewBag.Title = "Confirmation";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Monthly report for @Model.Report.LearnerName has been saved.</h2>

@using (Html.BeginForm("Confirmation", "MonthlyReport", Model))
{
    <h4>Enter your e-mail address to receive a copy of the report.</h4>
    <table>
        <tr>
            <td colspan="2">@Html.ValidationMessageFor(x => x.EmailAddress)</td>
        </tr>
        <tr>
            <td>@Html.TextBoxFor(x => x.EmailAddress, new { @class = "input-field" })</td>
            <td>
                <input type="submit" class="small-submit-button" value="Send" />
            </td>
        </tr>
    </table>
}

Answer 1

When you display the Confirmation view, you are passing the posted model from the Create action.

Once you POST the Confirmation form, you are posting the data in the inputs. Since you don't have inputs for the Report's properties... this information is not posted.

You have some options:

1. Add hiddens inputs for each relevant property in the Report model
2. Save the information in the server, and retrieve it once the user post the Confirmation form. You can save the Report data in the database, TempData or the session.