CheckboxFor not binding with nested objects - asp.net-mvc

Question

CheckBoxFor is not bounded when a property is defined in an object nested in the model?
Here is an example. I have a SearchOptions model that contains a List<Star> property. Each Star has a number, a name and a bool property that should be bounded:
public class SearchOptions
{
public SearchOptions()
{
// Default values
Stars = new List<Star>()
{
new Star() {Number=1, Name=Resources.Home.Index.Star1,
IsSelected=false},
new Star() {Number=2, Name=Resources.Home.Index.Star2,
IsSelected=false},
new Star() {Number=3, Name=Resources.Home.Index.Star3,
IsSelected=true},
new Star() {Number=4, Name=Resources.Home.Index.Star4,
IsSelected=true},
new Star() {Number=5, Name=Resources.Home.Index.Star5,
IsSelected=true},
};
}
public List<Star> Stars { get; set; }
}
In my strongly typed View (of SearchOptions) i loop over Stars property:
#using (Html.BeginForm("Do", "Home"))
{
<fieldset>
<legend>#MVC3TestApplication.Resources.Home.Index.Search</legend>
#{
foreach (Star s in Model.Stars)
{
#Html.CheckBoxFor(m => s.IsSelected)
<label>#s.Name</label>
}}
</fieldset>
<input type=submit value="Invia" />
}
The (relevant part of) controller is:
public ActionResult SearchOptions()
{
return View(new SearchOptions());
}
[HttpPost]
public ActionResult Do(SearchOptions s)
{
// Do some stuff
return View("SearchOptions", s);
}

Answer 1

It's because of how you're accessing the properties in the CheckBoxFor expression.
#for (int i = 0; i < Model.Stars.Count(); i++) {
#Html.CheckBoxFor(m => m.Stars[i].IsSelected)
<label>#Model.Stars[i].Name</label>
}
This should work for you.
Here's the output from the different methods:
//using the for loop
<input id="Stars_2__IsSelected" name="Stars[2].IsSelected" type="checkbox" value="true" />
//using the foreach
<input checked="checked" id="s_IsSelected" name="s.IsSelected" type="checkbox" value="true" />
You'll notice that the for foreach doesn't contain the proper name for it to match to when doing model binding.