Populating a Html.Listbox with all ASP.NET users

Question

I'm trying to create a page where a listbox will contain all my ASP.NET users.

However I'm having a lot of problems attempting to make the Html.Listbox accept the list of users.

I have tried doing this:

<%: Html.ListBox("Membershipusers", Membership.GetAllUsers())%>

and a zillion other approaches that is similar to this. I also have a method on my controller that looks like this:

    public ActionResult getAllMembershipUsers()
    {
        MembershipUserCollection membershipusers = new MembershipUserCollection();

        membershipusers = Membership.GetAllUsers();

        return View(membershipusers);
    }

It seems like it is able to create the list of users, but I still don't know how to show that list in my listbox.

Hope somebody can help me out here.

Darin Dimitrov · Accepted Answer · 2012-04-12 06:37:42Z

2

How about using a view model? Have you tried this approach?

public class UsersViewModel
{
    public IEnumerable<string> SelectedUsers { get; set; }
    public IEnumerable<SelectListItem> AvailableUsers { get; set; }
}

and then a controller which will populate this view model:

public ActionResult Index()
{
    var users = Membership.GetAllUsers().Cast<MembershipUser>();
    var model = new UsersViewModel
    {
        AvailableUsers = users.Select(u => new SelectListItem
        {
            Value = u.UserName,
            Text = u.UserName
        })
    };

    return View(model);
}

and finally in your strongly typed view to the view model

<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<UsersViewModel>" %>
...
<%= Html.ListBoxFor(x => x.SelectedUsers, Model.AvailableUsers) %>

answered Apr 12, 2012 at 6:37

Darin Dimitrov

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5 Comments

AronChan Over a year ago

I have used the approach you suggested. it seems to work fine except that i get this error: The model item passed into the dictionary is of type 'System.Collections.Generic.List`1[SkyLearn.Areas.Users.Models.User]', but this dictionary requires a model item of type 'SkyLearn.Areas.Users.Models.UsersViewModel'.

Darin Dimitrov Over a year ago

@AronChan, the error message seems pretty self explanatory. Your view is strongly typed to List<User> and you are passing a UsersViewModel to it. So you need to adapt your view model.

AronChan Over a year ago

care to elaborate a bit Darin? not entirely sure how i should change my model

Darin Dimitrov Over a year ago

@AronChan, it's very hard to elaborate on how you should change your model without me knowing how your model currently looks like. But you could add a property on the view model that is of type List<User> that will contain the data that you currently use as model.

AronChan Over a year ago

Hi.. since i changed so much in my way of doing this i created a new question here on stack in order to make the topic reflect what i am actually trying to achieve. it can be found here: stackoverflow.com/questions/10147129/…

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