动态复选框-错误:收集是只读的

我对MVC4很陌生，我过去使用asp.net的经验一直与Webforms一起工作，所以我认为我需要一些小心的手握。提前感谢!

我正在创建一个简单的web应用程序，类似于选择彩票号码。此时，用户选择他们想要的任何数字(没有限制，从"1"开始)并将其发布到下一页，在那里我继续对用户选择的数字做一些事情。可供选择的数字数量是动态的，由复选框表示。

问题是，当提交视图时，我得到错误页面"Collection is read-only"。

Model - lotttonnumbers .csBool [] numbers存储用户检查过的数字。

namespace Lotto.Models
{
    public class LottoNumbers
    {
        public string name { get; set; }
        public bool[] numbers { get; set; }
        public LottoNumbers() {
            numbers = new bool[49];
        }
        public LottoNumbers(int limit)
        {
            numbers = new bool[limit];
        }
    }
}

在HomeController.cs…我声明了lotttonnumbers ln和

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Lotto.Models;
namespace Lotto.Controllers
{
    public class HomeController : Controller
    {
        public LottoNumbers ln;
        public ActionResult Index()
        {
            return View();
        }
        public ActionResult SetNumbers()
        {
            ln = new LottoNumbers(30); 
            // 30 checkboxes will be generated on the view
            return View(ln);
        }
        [HttpPost]
        public ViewResult SetNumbers(LottoNumbers l)
        {
            // get checkbox values
            return View();
        }
    }
}

View - SetNumbers.cshtml

@model Lotto.Models.LottoNumbers
@{
    ViewBag.Title = "SetNumbers";
}
<h2>SetNumbers</h2>
@using (Html.BeginForm()) {
    <div>
        @Html.LabelFor(m => m.name)
        @Html.EditorFor(m => m.name)
    </div>
    <div id="numberlist">
    @for (int i = 0; i < Model.numbers.Length; i++)
    {
    <div class="item-number" style="">
        @Html.EditorFor(m => m.numbers[i])
        <label class="lbl-number" for="numbers[@i]">@(i+1)</label>
    </div>
    }
    </div>
    <div style="clear:both;">
        <input type="reset" value="Reset everything" />
        <input type="submit" value="Submit" />
    </div>
}

  public string Name { get; set; }
    public List<bool> Numbers { get; set; }
    public LottoNumbers()
    {
        Numbers = new List<bool>();
        for (var i = 0; i < 40; i++)
        {
            Numbers.Add(false);
        }
    }
    public LottoNumbers(int limit)
    {
        Numbers = new List<bool>();
        for (var i = 0; i < limit; i ++)
        {
            Numbers.Add(false);
        }
    }

@using (Html.BeginForm())
{
    <div>
        @Html.LabelFor(m => m.Name)
        @Html.EditorFor(m => m.Name)
    </div>
    <div id="numberlist">
        @for (var i = 0; i < Model.Numbers.Count; i++)
        {
            <div class="item-number" style="">
                @Html.CheckBox("Numbers[" + i.ToString() + "]")
                <label class="lbl-number" for="numbers[@(i + 1)]">@(i + 1)</label>
            </div>
        }
    </div>
    <div style="clear:both;">
        <input type="reset" value="Reset everything" />
        <input type="submit" value="Submit" />
    </div>
}

[HttpPost]
public ViewResult SetNumbers(LottoNumbers l)
{
    // get checkbox values
    return View(); //Nothing being passed to the view
}

@foreach (var numberBool in Model.Numbers)

[HttpPost]
public ViewResult SetNumbers(LottoNumbers l)
{
    //process stuff
    ln = new LottoNumbers(30);
    return View(ln);
}