Cannot implicitly convert type 'List<System.Web.Mvc.SelectListItem> to 'IEnumerable<Microsoft.AspNetCore.Mvc.Rendering.SelectListItem>'

Question

In my cshtml view I have this pre-made (scaffold) code that I changed a little to be able to put a list of enums down there instead of a textbox:

 <div class="form-group">
                <label asp-for="Color" class="control-label"></label>
                <select asp-for="Color" asp-items="Model.Colors" class="form-control"></select> 
                <span asp-validation-for="Color" class="text-danger"></span>
  </div>

Error occurs at Model.Colors.

And in my model I tried doing: Colors.Add(new List<SelectListItem>()); as told in Cannot implicitly convert type 'System.Web.Mvc.SelectList' to 'System.Collections.Generic.ICollection<System.Web.Mvc.SelectList>', but than I would get a different error; Cannot implicitly convert 'System.Collections.Generic.List' to 'System.Web.Mvc.SelectListItem'.

Even though Colors is a List<SelectListItem>.

But before that I had this in the ViewModel:

public EnumsDTO.Color Color { get; set; }
public List<SelectListItem> Colors { get; set; }
public void AddColorViewModel()
{
    Colors = new List<SelectListItem>();
    foreach (Color c in (Color[])Enum.GetValues(typeof(Color)))
    {
        Colors.Add(new SelectListItem
        {
            Value = ((int)c).ToString(),
            Text = c.ToString()
        });
    }
}

I was trying to follow this tutorial: https://www.youtube.com/watch?v=MPJ9PPCWxoI

Please provide a reproducible example, this code isnt clear thus its hard to see exactly what the problem is. — Kieran Devlin
– Kieran Devlin, Commented Nov 12, 2019 at 11:04
@KieranDevlin I was following this tutorial, but to show all code is a little too much because they have nothing to do with this. But it basically goes wrong when the guy in the tutorial tries to get de method to the cshtml-file with asp-items = Model.etc — zhrgci
– zhrgci, Commented Nov 12, 2019 at 11:15

Community · Accepted Answer · 2020-06-20 09:12:55Z

4

You are most likely using System.Web.Mvc namespace in your model at the top of the file. While SelectListItem exists there, the one that is expected in the view is from the Microsoft.AspNetCore.Mvc.Rendering namespace.

Therefore, there are 2 ways to resolve the issue:

Option 1

Get rid of using System.Web.Mvc;
Add using Microsoft.AspNetCore.Mvc.Rendering;

Option 2

Change the relevant occurrences of SelectListItem in your model to Microsoft.AspNetCore.Mvc.Rendering.SelectListItem

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Jun 10, 2020 at 20:36

Elhitch

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Comments

Jeremy Caney · Accepted Answer · 2021-10-08 20:51:04Z

0

you should first install:

Install-Package Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation -Version x.x.x

from NuGet according to dependency of your project or class library version and after that change:

using System.Web.Mvc;

to

using Microsoft.AspNetCore.Mvc.Rendering;

in every usage of SelectListItem.

edited Oct 8, 2021 at 20:51

Jeremy Caney

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answered Oct 8, 2021 at 13:09

Hossein Ashouri

1

Comments

Ragab Mohamad · Accepted Answer · 2024-12-12 00:25:28Z

0

Install NuGet Packages

Microsoft.AspNetCore.Http.Features
Microsoft.AspNetCore.Mvc.ViewFeatures

answered Dec 12, 2024 at 0:25

Ragab Mohamad

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