MVC Variable Length Collection Model is Null - asp.net-mvc

Question

I have a partial view for editing a collection (most of which I've truncated here):
#using CustomSurveyTool.Models
#model Basiclife
<div class="editorRow">
#using (Html.BeginCollectionItem(""))
{
<div class="form-horizontal">
<div class="row">
#Html.ValidationSummary(true, "", new { #class = "text-danger" })
<div class="col-md-2">
#Html.LabelFor(model => model.Plantype, htmlAttributes: new { #class = "control-label" })
#Html.EditorFor(model => model.Plantype, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.Plantype, "", new { #class = "text-danger" })
</div>
<div class="col-md-1">
X
</div>
</div>
</div>
}
</div>
Which is part of a wrapper view:
#using CustomSurveyTool.Models
#model IEnumerable<Basiclife>
#{
ViewBag.Title = "CreateBasicLifeResponse";
}
<h2>Basic Life Insurance Plans</h2>
<div id="planList">
#using (Html.BeginForm())
{
<div id="editorRows">
#foreach (var item in Model)
{
#Html.Partial("_BasicLifeResponse", item)
}
</div>
#Html.ActionLink("Add", "BasicLifeResponse", null, new { id = "addItem", #class = "button" });
<input type="submit" value="submit" />
}
</div>
Which posts back to this controller:
[HttpPost]
public ActionResult CreateBasicLifeResponse(IEnumerable<Basiclife> model)
{
foreach(var item in model)
{
string currentUserId = User.Identity.GetUserId();
Response targetresponse = db.response.FirstOrDefault(x => x.Userid == currentUserId);
int responseid = targetresponse.Id;
item.ResponseId = responseid;
db.basiclife.Add(item);
db.SaveChanges();
}
List<Basiclife> basiclife = new List<Basiclife>();
return View(model);
}
I am getting a NullReferenceException on the foreach(var item in model) after submitting the form. What could be causing this?

Answer 1

You need to follow the MVC naming convention which involves using a for loop with an index instead of foreach in your Razor view. Check out this article:
How to pass IEnumerable list to controller in MVC including checkbox state?.
I would recommend the Editor Template approach described in the article, it is most similar to your current PartialView approach.