c# - 遍历列表以获取“已检查”项目并将它们分配给属性 - HTTPPost

Question

我正在尝试让 foreach 循环检查复选框并返回所选 ietms 的 ID，并将它们设置为我的 ViewModel 中的 Month 属性。到目前为止，我已经在屏幕上显示了复选框并在 ViewModel 中获得了正确的参数（我希望如此）。当前，由于列表为空，foreach 语句出现错误。我该如何解决这个问题？

这是控制器：

public class SchedulerController : Controller
{
    // GET: Scheduler
    [HttpGet]
    public ActionResult SchedulerIndex()
    {

        List<Values> lst = new List<Values>();
        List<Values> lst2 = new List<Values>();
        List<Values> lst3 = new List<Values>();


        foreach (Values.Months month in Enum.GetValues(typeof(Values.Months)))
        {
            lst.Add(new Values { Month = month, IsChecked = false });
        }

        foreach (Values.DaysOfTheWeek day in Enum.GetValues(typeof(Values.DaysOfTheWeek)))
        {
            lst2.Add(new Values { DaysOfWeek = day, IsChecked = false });
        }


        //var DaysOfTheMonth = Enumerable.Range(1, 31);

        //foreach (var days in DaysOfTheMonth)
        //{
        //    lst3.Add(new Values { DayOfMonth = days, IsChecked = false });
        //}

        Values val = new Values();
        val.Jobs = new List<SelectListItem>();
        val.Jobs.Add(new SelectListItem() { Text = "Email", Value = "1", Selected = false });
        val.Jobs.Add(new SelectListItem() { Text = "Backup", Value = "2", Selected = false });
        val.Jobs.Add(new SelectListItem() { Text = "Start Application", Value = "3", Selected = false });
        val.Jobs.Add(new SelectListItem() { Text = "Job4", Value = "4", Selected = false });
        val.Jobs.Add(new SelectListItem() { Text = "Job5", Value = "5", Selected = false });




        List<Values> month11 = new List<Values>();
        month11.Add(new Values { monthID = 0, monthName = "Jan", IsChecked = false });
        month11.Add(new Values { monthID = 1, monthName = "Feb", IsChecked = false });
        month11.Add(new Values { monthID = 2, monthName = "Mar", IsChecked = false });
        month11.Add(new Values { monthID = 3, monthName = "Apr", IsChecked = false });
        month11.Add(new Values { monthID = 4, monthName = "May", IsChecked = false });
        month11.Add(new Values { monthID = 5, monthName = "Jun", IsChecked = false });
        month11.Add(new Values { monthID = 6, monthName = "Jul", IsChecked = false });
        month11.Add(new Values { monthID = 7, monthName = "Aug", IsChecked = false });
        month11.Add(new Values { monthID = 8, monthName = "Sep", IsChecked = false });
        month11.Add(new Values { monthID = 9, monthName = "Oct", IsChecked = false });
        month11.Add(new Values { monthID = 10, monthName = "Nov", IsChecked = false });
        month11.Add(new Values { monthID = 11, monthName = "Dec", IsChecked = false });



        List<Values> day6 = new List<Values>();
        day6.Add(new Values { dayID = 0, dayName = "Mon", IsChecked = false });
        day6.Add(new Values { dayID = 1, dayName = "Tue", IsChecked = false });
        day6.Add(new Values { dayID = 2, dayName = "Wed", IsChecked = false });
        day6.Add(new Values { dayID = 3, dayName = "Thu", IsChecked = false });
        day6.Add(new Values { dayID = 4, dayName = "Fri", IsChecked = false });
        day6.Add(new Values { dayID = 5, dayName = "Sat", IsChecked = false });
        day6.Add(new Values { dayID = 6, dayName = "Sun", IsChecked = false });

        val.MonthInfo = month11;

        val.DayInfo = day6;

        ViewBag.lst = lst;
        ViewBag.lst2 = lst2;
        ViewBag.lst3 = lst3;

        return View(val);
    }

    [HttpPost]
    public ActionResult ScheduleInfo(int Job, int Second, int Minute, int Hour, object Month, object DaysOfWeek)//,  string Month, string DaysOfWeek)// int DayOfMonth)
    {
        var val = new Values();

        val.Job = Job;
        val.Second = Second;
        val.Minute = Minute;
        val.Hour = Hour;


        foreach(var month in val.MonthInfo)
        {
            if (month.IsChecked == true)
            {
                val.Month = month.monthID;
            }
        }

        foreach (var day in val.DayInfo)
        {
            if (day.IsChecked == true)
            {
                val.DaysOfWeek = day.dayID;
            }
        }

        //val.Month = (int)((Values.Months)Enum.Parse(typeof(Values.Months), Month));
        //val.DaysOfWeek = (int)((Values.DaysOfTheWeek)Enum.Parse(typeof(Values.DaysOfTheWeek), DaysOfWeek));


        //        val.DayOfMonth = DayOfMonth; 

        return View();
    }


}

这是 ViewModel（我没有使用枚举，我打算摆脱它）：

        public enum Months
    {
        Jan = 0,
        Feb = 1,
        Mar = 2,
        Apr = 3,
        May = 4,
        Jun = 5,
        Jul = 6,
        Aug = 7,
        Sep = 8,
        Oct = 9,
        Nov = 10,
        Dec = 11
    }

    public enum DaysOfTheWeek
    {
        Mon = 0,
        Tue = 1,
        Wed = 2,
        Thu = 3,
        Fri = 4,
        Sat = 5,
        Sun = 6
    }

    public int DayOfMonth { get; set; }

    public object Month { get; set; }

    public object DaysOfWeek { get; set; }

    public bool IsChecked { get; set; }

    public int Second { get; set; }
    public int Minute { get; set; }
    public int Hour { get; set; }

    public int Job { get; set; }
    public List<SelectListItem> Jobs { get; set; }

    public int monthID { get; set; }
    public string monthName { get; set; }
    public List<Values> MonthInfo { get; set; }

    public int dayID { get; set; }
    public string dayName { get; set; }

    public List<Values> DayInfo { get; set; }
}

这是视图：

    @using (Html.BeginForm("ScheduleInfo", "Scheduler", FormMethod.Post))
{
    <center>
        <div style="text-align: center">
            <div class="form-group">
                @Html.DropDownListFor(m => m.Job, Model.Jobs)
            </div>
        </div>
    </center>

    <center>
        <div class="form-group" style="display:inline-block; padding-right:100px">
            <div class=" col-md-2">
                @Html.LabelFor(model => model.Second, "Second")
                @Html.TextBoxFor(model => model.Second)
            </div>
        </div>
        <div class="form-group" style="display:inline-block; padding-right:100px">
            <div class=" col-md-2">
                @Html.LabelFor(model => model.Minute, "Minute")
                @Html.TextBoxFor(model => model.Minute)
            </div>
        </div>
        <div class="form-group" style="display:inline-block; padding-right:100px">
            <div class=" col-md-2">
                @Html.LabelFor(model => model.Hour, "Hour")
                @Html.TextBoxFor(model => model.Hour)
            </div>
        </div>
    </center>
    <br />
    <br />

    <center>
        <div class="col-1">
            <ul class="list-group">
                <li class="list-group-item-heading list-group-item active">
                    <h4 class="list-group-item-text">Select the month(s) the task should be set at</h4>
                </li>
                @Html.HiddenFor(m => m.monthID)
                @Html.DisplayFor(m => m.monthName)
                @for (int i = 0; i < Model.MonthInfo.Count; i++)
                {
                    <li class="list-group-item" style="display:inline-block">
                        <div class="checkbox-inline">
                            @Html.HiddenFor(m => m.MonthInfo[i].monthID)
                            @Html.CheckBoxFor(m => m.MonthInfo[i].IsChecked)
                            @Html.LabelFor(m => m.MonthInfo[i].IsChecked, Model.MonthInfo[i].monthName)
                        </div>
                    </li>
                }
            </ul>
        </div>
    </center>

    <center>
        <div class="col-2">
            <ul class="list-group">
                <li class="list-group-item-heading list-group-item active">
                    <h4 class="list-group-item-text">Select the day(s) the task should be set at</h4>
                </li>
                @Html.HiddenFor(m=>m.dayID)
                @Html.DisplayFor(m=>m.dayName)
                @for(int i = 0; i < Model.DayInfo.Count; i++)
                {
                    <li class="list-group-item" style="display:inline-block">
                        <div class="checkbox-inline">
                            @Html.HiddenFor(m => m.DayInfo[i].dayID)
                            @Html.CheckBoxFor(m => m.DayInfo[i].IsChecked)
                            @Html.LabelFor(m => m.DayInfo[i].IsChecked, Model.DayInfo[i].dayName)
                        </div>
                    </li>
                }
            </ul>
        </div>
    </center>

  <input type="submit" value="Submit Data" id="btnSubmit" />

}

标签： c#asp.net-mvclistobjectviewmodel