我可以在 C# 中用 For 填充枚举吗？

Question

I'm working with Asp.net and MVC, creating a code where the person needs to enter month and year to perform a search. I created an Enum for the months of the Year, but I can't find it "right" to create an Enum for the years, as I would have to manually populate and each year add a new value.

In my Cshtml I had done it that way

<select name="ano">

  @for (int i = DateTime.Now.Year; i > 1999; i--)
  {
    <option>@i</option>
  }
</select>

But to go to the MVC standard, I wanted to put this information in an Enum inside my Model. Can I do something similar to dynamically place the years in an Enum?

Answer 1

MVC does not prescribe that everything must be a class or enum. It makes no sense to have enum members representing years.

What were you going to name them, Y2021 and then strip the Y ? Or use their underlying numeric value, ignoring the label?

Just use a loop and an integer, like you do now.

Answer 2

To approach to MVC standarts, you can do something like this

public ActionResult GetYear()
{
      var model=new ViewModel{ Year=2021,
      Years= Enumerable.Range( 1999,  DateTime.Now.Year -1998)
                         .OrderByDescending(x=>x)
                         .Select(x => new SelectListItem { Value=x.ToString(),Text=x.ToString()});

      return View(model);
}

GetYear.cshtml

@model ViewModel
.....

 <select class="form-control" id="levels" asp-for="@Model.Year" asp-items="@Model.Years"></select>

and ViewModel class

public ViewModel 
{
  public int Year {get;set;}
  public List<SelectListItem> Years {get; set;}
}