CODEWITHSUNDEEP
c#asp.net-mvc
CactusJuice
CactusJuice

Reputation: 23

MVC 5 MultiSelectList Selected Values Not Working

I have a ListBox in a View displaying the possible choices. However, the user's role(s) are not shown as selected. In my UserViewModel the Roles collection contains the complete list of roles, and AspNetRoles collection contains only the roles to which the user belongs. I've tried multiple examples/variations but nothing ever shows as selected. I'm stuck.

ViewModel:

public class UserViewModel
{
    public string Id { get; set; }

    public string Email { get; set; }

    public ICollection<AspNetRole> Roles { get; set; }

    public virtual ICollection<AspNetRole> AspNetRoles { get; set; }
}

Controller:

    public ActionResult Edit(string id)
    {
        UserViewModel user = new UserViewModel();
        AspNetUser aspNetUser = new AspNetUser();

        if (!string.IsNullOrEmpty(id))
        {
            aspNetUser = db.AspNetUsers.Find(id);
            user.Id = aspNetUser.Id;
            user.Email = aspNetUser.Email;
            user.AspNetRoles = aspNetUser.AspNetRoles;

            var roles = (from r in db.AspNetRoles
                        select r).ToList();
            user.Roles = roles;
        }

        return View(user);
    }

View:

@Html.ListBox("AspNetRoles",
    new MultiSelectList(Model.Roles, "Id", "Name", 
    Model.AspNetRoles.Select(m => m.Id)))

Upvotes: 2

Views: 4969

Answers (1)

user3559349
user3559349

Reputation:

You have not posted your model, but it appears that property AspNetRoles is a collection of a complex object (you cannot bind to a complex object, only a value type - or in the case of ListBox, a collection of value type). You can handle this by changing AspNetRoles to int[] (assuming the ID property of Role is int) 

@Html.ListBoxFor(m => m.AspNetRoles, new SelectList(Model.Roles, "Id", "Name"))

Note, Its always better to use the strongly typed helpers.

Upvotes: 2

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