ASP.NET-MVC-Study/BlazorApp/AspNetCoreMVC/Models/Models.cs

using System.ComponentModel.DataAnnotations;

namespace AspNetCoreMVC.Models
{
    public class TestModel
    {
        [Required]
        public int Id { get; set; }
        [Required]
        [StringLength(20)]
        public string Name { get; set; }
    }

    public class TestViewModel
    {
        public List<string> Names { get; set; }
    }
}