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Takeshi Okada
Takeshi Okada

Total Post:89

Posted on    March-29-2014 6:44 AM


 1 Reply(s)
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When I submit a form, my Courses List into my ViewModel is getting null values. This is my ViewModel:

public class CandidateViewModel


    public string Name { get; set; }

    public IList<CourseViewModel> Courses { get; set; }

    public CandidateViewModel()


        Name = "Kiwanax";

        Courses = new List<CourseViewModel>();

        for (int count = 0; count < 5; ++count)


            Courses.Add(new CourseViewModel(

                string.Format("Course_{0}", count), 5));




public class CourseViewModel


    public long ID { get; set; }

    public string Name { get; set; }

    public OptionViewModel SelectedOption { get; set; }

    public IList<OptionViewModel> Options { get; set; }

    public CourseViewModel(string name, int numberOfOptions)


        Name = name;

        Options = new List<OptionViewModel>();

        for (int count = 1; count <= numberOfOptions; ++count)


            Options.Add(new OptionViewModel(count.ToString(),

                string.Format("Option {0}", count)));


        SelectedOption = Options[0];



public class OptionViewModel


    public string Value { get; set; }

    public string Description { get; set; }


OK. When I create DropDownLists based on my IList, it works fine.

<ul id="cursos">

@for (int count = 0; count < Model.Courses.Count; ++count)



        @Html.DropDownListFor(i => i.Courses[count].SelectedOption,

            new SelectList(Model.Courses[count].Options, "Value", "Description", Model.Courses[count].SelectedOption))

                @Html.HiddenFor(i => i.Courses[count].ID)





But, when I do post from my form, I'm getting null values from that IList.

Pravesh Singh

Total Post:412

Posted on    March-29-2014 7:06 AM

Hi Takeshi,

You cannot bind dropdowns to complex property values:

i => i.Courses[count].SelectedOption

It must be bound to the corresponding primitive type that will be sent to the server:

i => i.Courses[count].SelectedOption.Value

Remember that in HTML the <select> element only sends the selected value as a simple string type to the server.

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