MVC 4 - Pass Data from View => Controller

Question

The entity "Bond" has a property named "Kauf" that is another entity ("Price" = date, addedBy, value).

Now, when in Create View of Bond ( = Buy), a value for Price needs to be entered. The standard Create View has no field for entering price data.

If I add

    <div class="editor-field">
        @Html.EditorFor(model => model.Kauf.Value)
        @Html.ValidationMessageFor(model => model.Kauf.Value)
    </div>

to the view, then how would I be able to grasp that value in the controller, where regularly only the entity "Bond" is accepted as parameter?

    [HttpPost]
    public ActionResult Create(Bond position)

Trying to access it through

    position.Kauf.Value

would just reference the (yet) empty property "Kauf" from bond, I guess. Thank you for input!

Your question is not very clear? Are you saying on the Post action the position is null? — Belogix
– Belogix, Commented May 29, 2013 at 15:19
Position is not null, but I can't get the value of Kauf. If as written above I add an editor field for model.Kauf.Value and adjust the ActionResult to "public ActionResult Create(Bond position, Preis Kaufpreis)", then Kaufpreis is just an empty Price... I dont know how to pass/read the value entered in the editor field for model.Kauf.Value back to the controller. — peter
– peter, Commented May 29, 2013 at 15:25
Given what you've provided, the model binding should work. Have you actually tried using position.Kauf.Value in the controller's post action? — Jason Berkan
– Jason Berkan, Commented May 29, 2013 at 15:42

Belogix · Accepted Answer · 2013-05-29 15:41:49Z

Posting as an answer as this is too long to comment. I have tried to recreate and it is all working here so I thought I would post what I have so you can compare with what you are doing:

I am assuming that Kauf.Value is a string here...

Controller

[HttpGet]
public ActionResult Create()
{
    // Setup model before passing in
    var model = new Bond();
    return View(model);
}

[HttpPost]
public ActionResult Create(Bond position)
{
    string theValue = position.Kauf.Value;
    // At this point "theValue" contains a valid item
    return View(position);
}

View

@model MvcExperiments.Models.Bond

@using(@Html.BeginForm())
{
    <div class="editor-field">
        @Html.EditorFor(model => model.Kauf.Value)
        @Html.ValidationMessageFor(model => model.Kauf.Value)
    </div>

    <p>
        <input type="submit" value="Save" />
    </p>    
}

James · Accepted Answer · 2013-05-29 15:43:26Z

If by "entity" you are referring to an actual ORM entity then that's probably what the issue is - you should be using view models for passing data to/from your views, not raw entities. For example, you can try the following:

Model

public class KaufViewModel
{
    public double Price { get; set; }
    public string Value { get; set; }
    ...
}

public class BondViewModel
{
    public KaufViewModel Kauf { get; set; }
}

Controller

[HttpGet]
public ActionResult Create()
{
    return View(new BondViewModel());
}

[HttpPost]
public ActionResult Create(BondViewModel bond)
{
    // bond.Kauf.Value should be set at this point (given it's set in the form)
    return View(bond); // fields should be re-populated
}

View

@model BondViewModel

@using(@Html.BeginForm())
{
    @Html.EditorFor(model => model.Kauf)
    <p><input type="submit" value="Save" /></p>
}

Mick MacCallum · Accepted Answer · 2013-12-18 18:22:58Z

None of the given answers here worked for me and I searched so much for a simple thing of passing data between action methods. So, here is my answer.

I have an action POST method that's called by a JS on a NavBar item click. This method instantiates a report instance, and passes it to be used by another action method. But here I'm returning a string clickedReport.

The ViewBag didn't work for me, returning the instance as a Model didn't work, and the only way it worked was by either using TempData or Session as shown below.

[HttpPost]
public ActionResult PopulateReport(int groupId, int itemId)
{
string clickedReport;

...

TempData["clickedReport"] = clickedReport;
Session["clickedReport"] = clickedReport;

return PartialView();

}

public ActionResult GridViewPartial()
{

// Now this other action method can get the clicked report assigned by the above action.
var tmpData = TempData["clickedReport"];
var sessionData = Session["clickedReport"];

// Runs the report instance and returns an object that holds a DataTable and other info to the grid that's in the calling partial view.

// Instantiate and populate GridConfig
GridConfig gridConfig = new GridConfig();
...

return PartialView("_GridViewPartial", gridConfig);

}

---- This is the view for the PopulateReport action i.e. PopulateReport.cshtml @Html.Action("GridViewPartial")

Hope this helps someone.

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