How to bind multi-select-list to a property within a list of objects?

Question

I tried the following but the AddFacultyDetailsViewModel is returned with empty FacultyConditionRow list

This is my viewModel

public class AddFacultyDetailsViewModel
{
    public AddFacultyDetailsViewModel()
    {
        Rows = new List<FacultyConditionRow>();
    }
    public SelectList ConditionsList { get; set; }
    public List<FacultyConditionRow> Rows { get; set; }
}

This is the type within the list

public class FacultyConditionRow
{
   public FacultyConditionRow()
   {
       SelectedConditionsExceptions = new List<int>();
   }
   public List<int> SelectedConditionsExceptions { get; set; }
}

This is the view that contains the multi-select-list

@model ViewModels.AddFacultyDetailsViewModel

@for (var i = 0; i < Model.Rows.Count; i++)
{
    <div class="input-group ">
        <select
          asp-for="@Model.Rows.ElementAt(i).SelectedConditionsExceptions"
          asp-items="@Model.ConditionsList">
        </select>
    </div>
}

Fei Han · Accepted Answer · 2020-06-12 03:24:44Z

1

the AddFacultyDetailsViewModel is returned with empty FacultyConditionRow list

To make selected value(s) can be bound to List<FacultyConditionRow> Rows property of your viewmodel class automatically, please modify the asp-for attribute of select tag helper as below.

<form method="post">
    @for (var i = 0; i < Model.Rows.Count; i++)
    {
        <div class="input-group ">
            <select asp-for="@Model.Rows[i].SelectedConditionsExceptions"
                    asp-items="@Model.ConditionsList">
            </select>
        </div>
    }
    <input type="submit" value="Submit" />
</form>

Test Result

Posted formdata

Debug result

answered Jun 12, 2020 at 3:24

Fei Han

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1 Comment

Ebrahim Mansour Over a year ago

Thanks so much, your answer is helpful

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