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MVC - Best way to pass viewModel data from one controller (form) to another

I have two forms, PreRegister.html and Register.cshtml.

PreRegister has a RadioButton group and I am trying to pass the user's selection - along with the CourseId that they had chosen to the Register controller/Form.

PreRegister.cshtml contains the following code:

 <div class="controls">
                    <label class="radio">
                        <input checked="checked" id="rbGrp" name="rbGrp" type="radio" value="1" /><label><b>Yes</b></label>
                       
                        <hr/>
                    </label>
                    <label class="radio">
                        <input id="rbGrp" name="rbGrp" type="radio" value="2" /><label><b>No</b></label>
                        
                    </label>
                </div>

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In my controller, I want to capture the user's selection plus the CourseId that had been passed into the PreRegister controller and then pass these values in an object to the full Register controller/form

This is what I have so far:

public ActionResult PreRegister(int id)
        {
            var viewModel = new RegistrationViewModel();
            {
                viewModel.Enrollment.CourseId = id;
            }
            return View(viewModel);
        }

        [HttpPost]
        public ActionResult PreRegister(RegistrationViewModel viewModel)
        {
            var enrollment = new Enrollment();
            enrollment.CourseId = viewModel.Enrollment.CourseId;
            enrollment.IsHdco = viewModel.Enrollment.IsHdco 
            //how to get IsHdco value from user selection of rbGrp?


            return RedirectToAction("Register", viewModel?? enrollment??);
            //how to pass the enrollment object over to Register?
        }

        public ActionResult Register(int id)
        {
            CodeCamper.Model.Course course = _coursesRepository.GetById(id);

            var viewModel = new PageContentViewModel();
            {
                viewModel.PageContent = course.Description;
                viewModel.Course = course;
            }

            return View(viewModel);
        }

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So I have 2 questions:

How do I get the value of the user selection from the radiobox group and translate it into a true/false?

How to I put this value plus CourseId into an object - either viewModel or Enrollment or something else and then transfer that as a parameter to the Register Controller that I want to geo to next?

Any help in figuring this out greatly appreciated.

RBS

ASKER CERTIFIED SOLUTION

Craig Wagner

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RBS

ASKER

Thanks for this very clear explanation Craig with sample code. One question arises - you said that "because the radiobutton isn't part of your model..."

Is there an advantage of making a radiobutton part of my model? Can you point to any resources that would explain how to do it or perhaps a sample line of code?

Thanks again for your explanation!

RBS

Craig Wagner

The advantage is that you get strong-typing in your model and you don't have to futz around with the FormCollection.

In the Model:

public class MyModel
{
public string Choice { get; set; }
}

In the View:

@Html.RadioButtonFor( model => model.Choice, "1" )
@Html.RadioButtonFor( model => model.Choice, "2" )

In the Controller:

[HttpPost]
public ActionResult Foo( MyModel viewModel )
{
if( viewModel.Choice == "2" )
{
}
else if( viewModel.Choice == "1" )
{
}
}

RBS

ASKER

Hi Craig:

A belated note to thank you for your additional explanation & code. Clear and just what I needed. Thanks,

RBS