How can I post a list of items in MVC

I wish I could see more of your classes and code, because you don’t have something set up right.

I recreated something from what you did provide, which works. I created an MVC 3 project for this sample.

Views/Shared/_Layout.cshtml

<!DOCTYPE html>
<html>
<head>
    <title>@ViewBag.Title</title>
    <link href="https://stackoverflow.com/questions/16321736/@Url.Content("~/Content/Site.css")" rel="stylesheet" type="text/css" />
    <script src="https://stackoverflow.com/questions/16321736/@Url.Content("~/Scripts/jquery-1.7.1.min.js")" type="text/javascript"></script>
</head>

    <body>
        @RenderBody()
    </body>
</html>

Views/Shared/_Partial.cshtml

@model RazorListTest.Models.AnswerScheme 

<table>
@for (int i = 0; i < Model.Answers.Count; i++) {
    <tr>
        <td>
            @Html.HiddenFor(model => Model.Answers[i].IsMissing)
            @Html.TextBoxFor(model => Model.Answers[i].Value, new { @class = "inputValue" })
        </td>
        <td>
            @Html.TextBoxFor(model => Model.Answers[i].Text, new { @class = "inputAnswer" })
        </td>
        <td><span class="span-delete" data-answer-scheme-id="@Model.Id" data-answer-id="@Model.Answers[i].Id" >x</span></td>
    </tr>
}
</table>

Models/AnswerDisplayItem.cs

using System.Collections.Generic;

namespace RazorListTest.Models
{
    public class AnswerDisplayItem
    {
        public bool IsMissing { get; set; }
        public string Text { get; set; }
        public string Value { get; set; }
        public string Id { get; set; }
    }

    public class AnswerScheme
    {
        public List<AnswerDisplayItem> Answers { get; set; }
        public string Id { get; set; }

        public AnswerScheme()
        {
            Answers = new List<AnswerDisplayItem>();
        }
    }
}

Home/Index.cshtml

@model RazorListTest.Models.AnswerScheme

    @using (Html.BeginForm(null, null, FormMethod.Get, new { name="formAnswerScheme", id = "formAnswerScheme"}))
    {
        {Html.RenderPartial("_Partial");}

        <div>
            <input type="button" value="Click me" id="btnClick"/>
        </div>

        <div id="divAnswerSchemeContainer">

        </div>
    }

<script type="text/javascript">
    $("#btnClick").click(function () {

        $.ajax({
            url: 'Home/AddAnswer',
            type: 'POST',
            dataType: 'json',
            data: $("#formAnswerScheme").serialize(),
            success: function (data) {
                console.log(data);
                $("#divAnswerSchemeContainer").html(data);
            },
            error: function (xhr, textStatus, exceptionThrown) { alert(JSON.parse(xhr.responseText)); }
        });
    });
</script>

Controllers/HomeController.cs

using System.Collections.Generic;
using System.Web.Mvc;
using RazorListTest.Models;

namespace RazorListTest.Controllers
{
    public class HomeController : Controller
    {

        public ActionResult Index()
        {
            AnswerScheme a = new AnswerScheme();

            a.Id = "1cd14b08-ce3b-4671-8cf8-1bcf69f12b2d";

            List<AnswerDisplayItem> adi = new List<AnswerDisplayItem>();
            AnswerDisplayItem a1 = new AnswerDisplayItem();
            a1.IsMissing = false;
            a1.Text = "Ja";
            a1.Value = "0";
            a1.Id = "1234";
            AnswerDisplayItem a2 = new AnswerDisplayItem();
            a2.IsMissing = false;
            a2.Text = "Nein";
            a2.Value = "1";
            a2.Id = "5678";
            adi.Add(a1);
            adi.Add(a2);
            a.Answers = adi;
            return View(a);
        }

        [HttpPost]
        public JsonResult AddAnswer(AnswerScheme answerScheme)
        {
            return Json("the list is in the Model.");
        }
    }
}

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