Saving the value from dropdown to entity framework MVC

Question

I am trying to save values from dropdownlist to the database using MVC 5 + Entity Framework. The values for the dropdownlist are taken from the DB (and displayed), but when I am saving the web entry then the value of the OrderSourceList is null and the OrderSourceId = 0 Model

public class OrderFullModel
{
    [Display(Name = "OrderSource")]
    public IList<SelectListItem> OrderSourceList {get;set;}

    public int OrderSourceId { get; set; }
}

Controller

public ActionResult Create() //this is returning the right dropdownlist
{
    var orderSources = _repository.All<OrderSource>().OrderBy(m => m.NameRu).ToList();
    ViewBag.MyOrderSources = new SelectList(orderSources, "Id", "NameRu", 0);
    return View();
}

View

@Html.LabelFor(m => m.OrderSourceList)
@Html.DropDownListFor(m => m.OrderSourceList, (SelectList)ViewBag.MyOrderSources)

Thomas Boby · Accepted Answer · 2015-11-01 19:53:03Z

2

The DropDownListFor is a helper that expects an expression for the value in the list you want to display/set, so:

@Html.DropDownListFor(m => m.OrderSourceId, (SelectList)ViewBag.MyOrderSources)

Currently you're asking for a dropdown to set the value of a list.

From the Docs:

public static MvcHtmlString DropDownListFor(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression,
IEnumerable<SelectListItem> selectList)

expression: An expression that identifies the object that contains the properties to display.

selectList: A collection of SelectListItem objects that are used to populate the drop-down list.

edited Nov 1, 2015 at 19:53

answered Nov 1, 2015 at 19:32

Thomas Boby

7899 silver badges23 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Dmitrij Kultasev Over a year ago

then I am getting Message=The ViewData item that has the key 'OrderSourceId' is of type 'System.Int32' but must be of type 'IEnumerable<SelectListItem>'.

Thomas Boby Over a year ago

I would suggest you have a look at this answer for an example of how it all fits together. It seems odd that you have a list of SelectListItems in your model, should that not be a list of OrderSources?

user3559349 Over a year ago

@sidux, You get that error because ViewBag.MyOrderSources is null, most likely because you did not reassign the value in the POST method if you returned the view because ModelState was invalid.

user3559349 Over a year ago

@sidux, But why are you assigning the SelectList to ViewBag? Your model already has a property named OrderSourceList so it should be var model = new OrderFullModel(); model.OrderSourceList = orderSources; return View(model); in the controller and @Html.DropDownListFor(m => m.OrderSourceId, Model.OrderSourceList) in the view.

Collectives™ on Stack Overflow

Saving the value from dropdown to entity framework MVC

1 Answer 1

4 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related