Add constructor for the SelectListItem class

src/Microsoft.AspNetCore.Mvc.ViewFeatures/Internal/DefaultDisplayTemplates.cs

@@ -64,24 +64,9 @@ namespace Microsoft.AspNetCore.Mvc.ViewFeatures.Internal
         {
             return new List<SelectListItem>
             {
-                new SelectListItem
+                new SelectListItem(Resources.Common_TriState_NotSet, string.Empty, !value.HasValue),
-                {
+                new SelectListItem(Resources.Common_TriState_True, "true", (value == true)),
-                    Text = Resources.Common_TriState_NotSet,
+                new SelectListItem(Resources.Common_TriState_False, "false", (value == false)),
-                    Value = string.Empty,
-                    Selected = !value.HasValue
-                },
-                new SelectListItem
-                {
-                    Text = Resources.Common_TriState_True,
-                    Value = "true",
-                    Selected = (value == true),
-                },
-                new SelectListItem
-                {
-                    Text = Resources.Common_TriState_False,
-                    Value = "false",
-                    Selected = (value == false),
-                },
             };
         }
 

src/Microsoft.AspNetCore.Mvc.ViewFeatures/Rendering/SelectListItem.cs

@@ -10,6 +10,16 @@ namespace Microsoft.AspNetCore.Mvc.Rendering
     /// </summary>
     public class SelectListItem
     {
+        public SelectListItem() { }
+
+        public SelectListItem(string text, string value, bool selected = false, bool disabled = false)
+        {
+            Disabled = disabled;
+            Selected = selected;
+            Text = text;
+            Value = value;
+        }
+
         /// <summary>
         /// Gets or sets a value that indicates whether this <see cref="SelectListItem"/> is disabled.
         /// This property is typically rendered as a <code>disabled="disabled"</code> attribute in the HTML