Displaying month in dropdownlist MVC "Object reference not set to an instance of an object."

Question

I need to display month and year list to dropdownlist in MVC but i encounter an error "Object reference not set to an instance of an object."

MODEL

public class AccountingViewModel
    {
    public string StartMonth { get; set; }

    public IEnumerable<SelectListItem> Months
            {
                get
                {
                    return DateTimeFormatInfo
                           .InvariantInfo
                           .MonthNames
                           .Select((monthName, index) => new SelectListItem
                           {
                               Value = (index + 1).ToString(),
                               Text = monthName
                           });
                }
            }
    }

VIEW

    @model TrackAndTrace.ViewModel.AccountingViewModel
@using (Html.BeginForm("AccountingReport", "Report", FormMethod.Post))
    {
    <div class="form-group">
                    @Html.LabelFor(model => model.StartMonth)
                    @Html.DropDownListFor(model=>model.StartMonth,Model.Years)
                    @Html.ValidationMessageFor(model => model.StartMonth)
    </div>
     }

@DilipN @Html.DropDownListFor(model=>model.StartMonth,Model.Months) when i put breakpoint is says null it does not go to Months method — Reynan, Dec 21 '15 at 07:46
@Reynan Did you make a mistake again with `Model.Years` not existing in model or is it your issue? — kamil-mrzyglod, Dec 21 '15 at 07:50
@DilipN its another mistake i need to display both months and years. same issue. the method is not firing. — Reynan, Dec 21 '15 at 07:51
@Reynan : Please check i have solved your problem and let me know — Dilip Oganiya, Dec 21 '15 at 08:02

Dilip Oganiya · Answer 1 · 2015-12-21T08:15:40.113

0

This is solution of your problem.

 Replace this code with your code in your AccountingView model.

 public IEnumerable<SelectListItem> Months
        {
            get
            {
                return DateTimeFormatInfo
                       .InvariantInfo
                       .MonthNames
                       .TakeWhile(monthName => monthName != String.Empty)
                       .Select((monthName, index) => new SelectListItem
                       {
                           Value = (index +     1).ToString(CultureInfo.InvariantCulture),
                           Text = string.Format("({0}) {1}", index + 1, monthName)
                       });
            }
        }

Replace this code with your view code

@Html.DropDownListFor(model => model.StartMonth, new     SelectList(Model.Months, "Value", "Text", " "))

edited Dec 21 '15 at 08:15

answered Dec 21 '15 at 08:02

Dilip Oganiya

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still the same error. It is null when calling Model.Months – Reynan Dec 21 '15 at 08:07
Please read my updated answer – Dilip Oganiya Dec 21 '15 at 08:16
same error. i copied your whole code. – Reynan Dec 21 '15 at 08:22

Displaying month in dropdownlist MVC "Object reference not set to an instance of an object."

1 Answers1