Empty Enumeration in post method - asp.net-mvc-3

Question

I have this view
#model IEnumerable<ViewModelRound2>
... <snip> ...
#{
using (Html.BeginForm(new { round1Ring3Bids = Model }))
{
if (Model != null && Model.Count() > 0)
{
... <snip> ...
#for (var x = 0; x < Model.Count(); x++)
{
ViewModelRound2 viewModelRound2 = Model.ElementAt(x);
Bid bid = viewModelRound2.Bid;
string userName = #bid.User.Invitation.Where(i => i.AuctionId == bid.Lot.Lot_Auction_ID).First().User.User_Username;
<tr>
<td>
#userName
</td>
<td>
#bid.Bid_Value
</td>
<td>
#Html.EditorFor(c => c.ElementAt(x).SelectedForRound2)
</td>
</tr>
}
</table>
<div class="buttonwrapper2">
<input type="submit" value="Select"/>
</div>
}
}
}
I have a post method that this goes to when the submit button is hit
[HttpPost]
public ActionResult Round2Manager(IEnumerable<ViewModelRound2> round1Ring3Bids)
Problem is that the enumeration is always empty. Why is this?

Answer 1

Problem is that the enumeration is always empty. Why is this?
Because you are not respecting the wire format that the default model binder expects to bind collections.
The following:
#Html.EditorFor(c => c.ElementAt(x).SelectedForRound2)
generates absolutely wrong names for your input fields.
I would recommend you using editor templates to avoid those kind of problems:
#model IEnumerable<ViewModelRound2>
#using (Html.BeginForm())
{
if (Model != null && Model.Count() > 0)
{
<table>
#Html.EditorForModel()
</table>
<div class="buttonwrapper2">
<input type="submit" value="Select"/>
</div>
}
}
and then define a custom editor template for the ViewModelRound2 type (~/View/Shared/EditorTemplates/ViewModelRound2.cshtml) which will automatically be rendered for each element of this collection:
#model ViewModelRound2
# {
string userName = Model.Bid.User.Invitation.Where(
i => i.AuctionId == Model.Bid.Lot.Lot_Auction_ID
).First().User.User_Username;
}
<tr>
<td>
#userName
</td>
<td>
#Model.Bid.Bid_Value
</td>
<td>
#Html.EditorFor(c => c.SelectedForRound2)
</td>
</tr>
You will now notice how the text input fields have correct names:
name="[0].SelectedForRound2"
name="[1].SelectedForRound2"
name="[2].SelectedForRound2"
...
Compare this with your initial values.