如何创建允许用户选择月份的下拉列表？

Question

Right now I have this and it all works fine.

PossibleExpirationMonths = creditCardInterpreter.GetPossibleMonths()

The GetPossibleMonths method:

    public List<dynamic> GetPossibleMonths()
    {
        return new List<dynamic>()
        {
            new {Display = "01 Jan", Value = 1 },
            new {Display = "02 Feb", Value = 2 },
            new {Display = "03 Mar", Value = 3 },
            new {Display = "04 Apr", Value = 4 },
            new {Display = "05 May", Value = 5 },
            new {Display = "06 Jun", Value = 6 },
            new {Display = "07 Jul", Value = 7 },
            new {Display = "08 Aug", Value = 8 },
            new {Display = "09 Sep", Value = 9 },
            new {Display = "10 Oct", Value = 10 },
            new {Display = "11 Nov", Value = 11 },
            new {Display = "12 Dec", Value = 12 }
        };
    }

and how I'm displaying it:

@Html.DropDownListFor(model => model.ExpirationMonth, new SelectList(Model.PossibleExpirationMonths, "Value", "Display"), new { @class = "form-control" })

The problem I'm running into is that when I try to test the method and access the Display and Value properties of the dynamic like

returnedList.First().Display

I get an error. Microsoft.CSharp.RuntimeBinder.RuntimeBinderException : 'object' does not contain a definition for 'Display'

The reason I want to use dynamics here is because I don't feel like I should create a container class that contains such a little amount of information. It just creates bloat and I'm TRYING to be cleaner.

Any thoughts/suggestions?

Answer 1

The problem is that .First() always returns type Object . You can try:

((dynamic)returnedList.First()).Display

I think you might be re-inventing the wheel a bit, though. Why aren't you using a DateTimePicker or similar control? All of the things you're wanting out of this are properties of a DateTime (specifically, DateTime.Month ) . For the web, this solution works well.