Bind multiple values to model on post

Question

I managed to get a checkboxlist working, and I can't somehow get the values back when I post the "usual way". Must I use Request.Form and loop them into the model before updating the database?

"userobj" has it's userobj.UsersUsergroups count = 0 on post.

control:

        [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult UserEdit([BindAttribute(Include = "Firstname,Surname,Username,Email,Password,UserID,UsergroupID")]User userobj)
    {
        if (ModelState.IsValid)
        {
            try
            {
                us.SaveUser(userobj);
            }
            catch
            {
                ModelState.AddModelError("SomeError", "errrrrrrrrror");
            }
        }

        return View("UserDetail", new UsersAdminModel { User = userobj });
    }

And I have checkboxes generated as:

<input id="UsergroupID_0" name="UsergroupID" type="checkbox" value="2" /> <label for="UsergroupID_0" id="label-0">Grupp 1</label><br />
<input id="UsergroupID_1" name="UsergroupID" type="checkbox" value="3" /> <label for="UsergroupID_1" id="label-1">Grupp 2</label><br />
<input id="UsergroupID_2" name="UsergroupID" type="checkbox" value="4" /> <label for="UsergroupID_2" id="label-2">234234</label><br />
<input id="UsergroupID_3" name="UsergroupID" type="checkbox" value="5" /> <label for="UsergroupID_3" id="label-3">234234</label><br />
<input id="UsergroupID_4" name="UsergroupID" type="checkbox" value="6" /> <label for="UsergroupID_4" id="label-4">234234</label><br />
<input id="UsergroupID_5" name="UsergroupID" type="checkbox" value="7" /> <label for="UsergroupID_5" id="label-5">345345345</label><br />
<input id="UsergroupID_6" name="UsergroupID" type="checkbox" value="8" /> <label for="UsergroupID_6" id="label-6">3453453456</label><br />
<input id="UsergroupID_7" name="UsergroupID" type="checkbox" value="9" /> <label for="UsergroupID_7" id="label-7">Grupp 122</label><br />

How can I "populate" the User-object with the checked values after post?

Thanks in advance /M

EDIT:

I tried with:

[AcceptVerbs(HttpVerbs.Post)] public ActionResult UserEdit([BindAttribute(Include = "Firstname,Surname,Username,Email,Password,UserID,UsergroupID")]User userobj, IList UsergroupID)

and it seems to assign the values from the checkboxes to that list...

But what shall I do to assign it to userobj.UsersUsergroups? wrong types when I try

/M

Answer 1

Check out Phil Haack's excellent blog post on how to model bind a list of elements.

Whether you'll be able to use this directly or not, I'm not sure, but you could always get the ids in a separate parameter and then retrieve the groups by id to add to your user object. I don't know that it will populate the groups from the database just given the ids. A custom model binder may be needed for that.

<input type="hidden" name="UserGroupID.Index" value="0" />
<input type="checkbox" name="UserGroupID[0]" id="UserGroupID_0" value="0" />
    <label for="UsergroupID_0" id="label-0">Group 0</label><br />
 <input type="checkbox" name="UserGroupID[1]" id="UserGroupID_1" value="1" />
    <label for="UsergroupID_1" id="label-1">Group 1</label><br />
 ...