How do I set the selected value using dropdownlistfor

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Hi All,

I have a model that one its properties should be updated using a drop-down box. I created a viewmodel for it so as to enjoy model-binding at the view but my previously selected value is not showing when I launch the edit page. Please what parameters do I pass to ensure the previous selected item shows when the edit page is launched.
Please find below my view model, controller and view page.

ViewModel

C#

namespace ProAssure.ICMS.Web.Models.Severity
{
    public class SeverityUpdateViewModel
    {
        public SelectList Criticality { set; get; }


        public SeverityUpdateViewModel(SeverityUpdateDto severityUpdateDto)
        {
            List<SelectListItem> dummyList = new List<SelectListItem>();

            foreach (var availableCriticality in severityUpdateDto.Criticality)
            {
                var listItem = new SelectListItem()
                {
                    Text = availableCriticality.ToString(),
                    Value = availableCriticality.ToString()
                  , Selected = availableCriticality.ToString().Equals(severityUpdateDto.Selected.ToString())

                };
                dummyList.Add(listItem);
            }

            this.Criticality = new SelectList(dummyList, "Text", "Value", severityUpdateDto.Selected.ToString());
        }
    }
}

Controller

C#

public async Task<ActionResult> Edit(int? id)
{
    SeverityUpdateViewModel severityUpdateViewModel = new SeverityUpdateViewModel(severity);

    return View(severityUpdateViewModel);
}

View

HTML

<div class="form-group">
    @Html.LabelFor(model => model.Criticality, htmlAttributes: new { @class = "control-label col-md-3" })
    <div class="col-md-9">
        @Html.DropDownListFor(model => model.Criticality, Model.Criticality, new { htmlAttributes = new { @class = "form-control" } })
        @Html.ValidationMessageFor(model => model.Criticality, "", new { @class = "text-danger" })
    </div>
</div>

Thank you very much

Posted 31-Aug-15 4:57am

Member 11879085

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Juan de Villiers · Answer 1 · 2015-08-31T07:11:00

This is the way I have used the DropDownListFor method to fill and select drop downs:

Include the drop down list in the model as a property

C#

@Html.DropDownListFor(model => model.AvailabilityCriticalID, Model.AvailabilityCriticalityList)

Inside the model:

C#

public IEnumerable<SelectListItem> AvailabilityCriticalityList
{
    get
    {
        IEnumerable<SelectListItem> Results = (from x in GetAvailabilityCriticalityList()
                                               select new SelectListItem() { Text = x.ToString(), Value = x.AvailabilityCriticalityID.ToString() });

        return Results;
    }
}

The selection of the item in the drop down is automatic.