Select tag helper: retarget net10.0, drop the enum wrapper class, fix the Bootstrap select classes

aspnetcore-features/SelectTagHelperSolution/SelectTagHelper/Controllers/HomeController.cs

@@ -13,24 +13,12 @@ public IActionResult Index()
         {
             var model = new ProductViewModel
             {
-                Products = new List<SelectListItem>
-                {
-                    new SelectListItem
-                    {
-                        Text = "Motherboards",
-                        Value = "MB"
-                    },
-                    new SelectListItem
-                    {
-                        Text = "Graphic Cards",
-                        Value = "GC"
-                    },
-                    new SelectListItem
-                    {
-                        Text = "Liquid Coolants",
-                        Value = "LC"
-                    }
-                },
+                Products =
+                [
+                    new() { Text = "Motherboards", Value = "MB" },
+                    new() { Text = "Graphic Cards", Value = "GC" },
+                    new() { Text = "Liquid Coolants", Value = "LC" }
+                ],
                 Product = "GC"
             };
 
@@ -74,6 +62,17 @@ public IActionResult SelectTagHelperWithEnum()
             return View(model);
         }
 
+        //Usage of a disabled first item to render a placeholder row
+        public IActionResult Placeholder()
+        {
+            var model = new SelectViewModel
+            {
+                Genders = StaticRepository.GetGendersWithPlaceholder(),
+                SelectedGender = string.Empty
+            };
+            return View(model);
+        }
+
         //Consolidated action method - renders select element using all the approaches
         public IActionResult Details()
         {
@@ -142,4 +141,4 @@ public IActionResult Error()
             return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
         }
     }
-}
+}

aspnetcore-features/SelectTagHelperSolution/SelectTagHelper/Enums/Department.cs

@@ -0,0 +1,10 @@
+namespace SelectTagHelper.Enums
+{
+    public enum Department
+    {
+        IT,
+        HR,
+        Finance,
+        Admin
+    }
+}

aspnetcore-features/SelectTagHelperSolution/SelectTagHelper/Models/EmployeeViewModel.cs

@@ -3,6 +3,6 @@
     public class EmployeeViewModel
     {
         public int Id { get; set; }
-        public string EmployeeName { get; set; }
+        public string EmployeeName { get; set; } = string.Empty;
     }
-}
+}

aspnetcore-features/SelectTagHelperSolution/SelectTagHelper/Models/ErrorViewModel.cs

@@ -2,8 +2,8 @@ namespace SelectTagHelper.Models
 {
     public class ErrorViewModel
     {
-        public string RequestId { get; set; }
+        public string? RequestId { get; set; }
 
         public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
     }
-}
+}

aspnetcore-features/SelectTagHelperSolution/SelectTagHelper/Models/GroupViewModel.cs

@@ -4,6 +4,6 @@ namespace SelectTagHelper.Models
 {
     public class GroupViewModel
     {
-        public List<SelectListItem> Courses { get; set; }
+        public List<SelectListItem> Courses { get; set; } = [];
     }
-}
+}

aspnetcore-features/SelectTagHelperSolution/SelectTagHelper/Models/MultiSelectViewModel.cs

@@ -2,7 +2,7 @@
 {
     public class MultiSelectViewModel
     {
-        public List<EmployeeViewModel> Employees { get; set; }
-        public int[] SelectedEmployeeIds { get; set; }
+        public List<EmployeeViewModel> Employees { get; set; } = [];
+        public int[] SelectedEmployeeIds { get; set; } = [];
     }
-}
+}

aspnetcore-features/SelectTagHelperSolution/SelectTagHelper/Models/ProductViewModel.cs

@@ -4,7 +4,7 @@ namespace SelectTagHelper.Models
 {
     public class ProductViewModel
     {
-        public string Product { get; set; }
-        public List<SelectListItem> Products { get; set; }
+        public string? Product { get; set; }
+        public List<SelectListItem> Products { get; set; } = [];
     }
-}
+}

aspnetcore-features/SelectTagHelperSolution/SelectTagHelper/Models/SampleViewModel.cs

@@ -1,9 +1,9 @@
-using static SelectTagHelper.Enums.Enumerations;
+using SelectTagHelper.Enums;
 
 namespace SelectTagHelper.Models
 {
     public class SampleViewModel
     {
         public Department Department { get; set; }
     }
-}
+}

aspnetcore-features/SelectTagHelperSolution/SelectTagHelper/Models/SelectViewModel.cs

@@ -1,17 +1,17 @@
 using Microsoft.AspNetCore.Mvc.Rendering;
-using static SelectTagHelper.Enums.Enumerations;
+using SelectTagHelper.Enums;
 
 namespace SelectTagHelper.Models
 {
     public class SelectViewModel
     {
-        public List<SelectListItem> Genders { get; set; }
-        public string SelectedGender { get; set; }
-        public List<EmployeeViewModel> Employees { get; set; }
+        public List<SelectListItem> Genders { get; set; } = [];
+        public string? SelectedGender { get; set; }
+        public List<EmployeeViewModel> Employees { get; set; } = [];
         public int? SelectedEmployeeId { get; set; }
-        public SelectList Countries { get; set; }
-        public string SelectedCountry { get; set; }
+        public SelectList? Countries { get; set; }
+        public string? SelectedCountry { get; set; }
         public Department Department { get; set; }
         public int? SelectedDepartment { get; set; }
     }
-}
+}

aspnetcore-features/SelectTagHelperSolution/SelectTagHelper/Program.cs

@@ -1,36 +1,27 @@
-namespace SelectTagHelper
-{
-    public class Program
-    {
-        public static void Main(string[] args)
-        {
-            var builder = WebApplication.CreateBuilder(args);
+var builder = WebApplication.CreateBuilder(args);
 
-            // Add services to the container.
-            builder.Services.AddControllersWithViews();
+// Add services to the container.
+builder.Services.AddControllersWithViews();
 
-            var app = builder.Build();
+var app = builder.Build();
 
-            // Configure the HTTP request pipeline.
-            if (!app.Environment.IsDevelopment())
-            {
-                app.UseExceptionHandler("/Home/Error");
-                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
-                app.UseHsts();
-            }
+// Configure the HTTP request pipeline.
+if (!app.Environment.IsDevelopment())
+{
+    app.UseExceptionHandler("/Home/Error");
+    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
+    app.UseHsts();
+}
 
-            app.UseHttpsRedirection();
-            app.UseStaticFiles();
+app.UseHttpsRedirection();
+app.UseStaticFiles();
 
-            app.UseRouting();
+app.UseRouting();
 
-            app.UseAuthorization();
+app.UseAuthorization();
 
-            app.MapControllerRoute(
-                name: "default",
-                pattern: "{controller=Home}/{action=Index}/{id?}");
+app.MapControllerRoute(
+    name: "default",
+    pattern: "{controller=Home}/{action=Index}/{id?}");
 
-            app.Run();
-        }
-    }
-}
+app.Run();

aspnetcore-features/SelectTagHelperSolution/SelectTagHelper/SelectTagHelper.csproj

@@ -1,8 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
   </PropertyGroup>
 
 </Project>

aspnetcore-features/SelectTagHelperSolution/SelectTagHelper/StaticData/StaticRepository.cs

@@ -5,99 +5,39 @@ namespace SelectTagHelper.StaticData
 {
     public class StaticRepository
     {
-        public static List<SelectListItem> GetGenders()
-        {
-            return new List<SelectListItem>
-            {
-                new SelectListItem
-                {
-                    Text = "Male",
-                    Value = "Male"
-                },
-                new SelectListItem
-                {
-                    Text = "Female",
-                    Value = "Female"
-                },
-                new SelectListItem
-                {
-                    Text = "Others",
-                    Value = "Others"
-                }
-            };
-        }
+        public static List<SelectListItem> GetGenders() =>
+        [
+            new() { Text = "Male", Value = "Male" },
+            new() { Text = "Female", Value = "Female" },
+            new() { Text = "Others", Value = "Others" }
+        ];
 
-        public static List<EmployeeViewModel> GetEmployees()
-        {
-            return new List<EmployeeViewModel>
-            {
-                new EmployeeViewModel
-                {
-                    Id = 101,
-                    EmployeeName = "Mark"
-                },
-                new EmployeeViewModel
-                {
-                    Id = 102,
-                    EmployeeName = "Dave"
-                },
-                new EmployeeViewModel
-                {
-                    Id = 103,
-                    EmployeeName = "Rosy"
-                }
-            };
-        }
+        public static List<SelectListItem> GetGendersWithPlaceholder() =>
+        [
+            new() { Text = "Please select a gender", Value = "", Disabled = true, Selected = true },
+            .. GetGenders()
+        ];
 
-        public static List<string> GetCountries()
-        {
-            return new List<string>
-            {
-                "India","USA","UK","France","Germany"
-            };
-        }
+        public static List<EmployeeViewModel> GetEmployees() =>
+        [
+            new() { Id = 101, EmployeeName = "Mark" },
+            new() { Id = 102, EmployeeName = "Dave" },
+            new() { Id = 103, EmployeeName = "Rosy" }
+        ];
 
-        public static List<SelectListItem> GetCourses(SelectListGroup science, SelectListGroup humanities)
-        {
-            return new List<SelectListItem>
-            {
-                new SelectListItem
-                {
-                    Text  = "Physics",
-                    Value = "PH101",
-                    Group = science
-                },
-                new SelectListItem
-                {
-                    Text = "Chemistry",
-                    Value = "CH101",
-                    Group = science
-                },
-                new SelectListItem
-                {
-                    Text = "Mathematics",
-                    Value = "MT101",
-                    Group = science
-                },
-                new SelectListItem
-                {
-                    Text = "English",
-                    Value = "EN101",
-                    Group = humanities
-                },
-                new SelectListItem
-                {
-                    Text = "Environmental Studies",
-                    Value = "EN101",
-                    Group = humanities
-                },
-                new SelectListItem
-                {
-                    Text = "Economics",
-                    Value = "EC101",
-                    Group = humanities
-                }
-            };
-        }
+        public static List<string> GetCountries() =>
+        [
+            "India", "USA", "UK", "France", "Germany"
+        ];
+
+        public static List<SelectListItem> GetCourses(SelectListGroup science, SelectListGroup humanities) =>
+        [
+            new() { Text = "Physics", Value = "PH101", Group = science },
+            new() { Text = "Chemistry", Value = "CH101", Group = science },
+            new() { Text = "Mathematics", Value = "MT101", Group = science },
+            new() { Text = "English", Value = "EN101", Group = humanities },
+            new() { Text = "Environmental Studies", Value = "EN101", Group = humanities },
+            new() { Text = "Economics", Value = "EC101", Group = humanities }
+        ];
     }
-}
+}