asp.net mvc 5 DropDownListFor始终为空

Question

I have a viewmodel class that contains the following:

public class PersonalDetailViewModel
{
    public int TitleOfCourtesyId { get; set; }

    [Display(Name = "Title of Courtesy")]
    public IEnumerable<SelectListItem> TitlesOfCourtesy { get; set; }

    public PersonalDetailViewModel(){

        using(var db = new MyDbContext())
        {
            TitlesOfCourtesy = db.TitleOfCourtesies.ToList().Select(i => 
                                                new SelectListItem
                                                {
                                                    Text = i.TitleOfCourtesyName,
                                                    Value = i.ID.ToString(),
                                                    Selected = i.ID == TitleOfCourtesyId
                                                });
        }            

    }
}

This works fine and loads all the values from the DB into the TitlesOfCourtesy object. Please note that neither TitleOfCourtesyId nor TitlesOfCourtesy is marked as Required .

My view has the following code to bind this list to a drop down list:

@Html.ValidationSummary()
<div class="form-group">
    @Html.LabelFor(m => m.TitlesOfCourtesy, new { @class = "control-label col-sm-4" })

    <div class="col-sm-4">
        @Html.DropDownListFor(m => m.TitleOfCourtesyId, Model.TitlesOfCourtesy, "Select", new { @class = "form-control", autofocus = ""})
    </div>
    <div class="col-sm-4">

    </div>
</div>

But on the Submit button, the client validation prompts me as The TitleOfCourtesyId field is required. . Why? I have not mentioned it as Required in my code. Am I missing something?

Thanks for reading.

Answer 1

change it to int? , (since int has a default value as zero)