Extract 'sortable' formatting from GridEntry

DataLayer/EfClasses/Book.cs

@@ -51,6 +51,9 @@ namespace DataLayer
             : Category.ParentCategory is null ? new[] { Category.AudibleCategoryId }
             : new[] { Category.ParentCategory.AudibleCategoryId, Category.AudibleCategoryId };
 
+        public string TitleSortable => Formatters.GetSortName(Title);
+        public string SeriesSortable => Formatters.GetSortName(SeriesNames);
+
         // is owned, not optional 1:1
         public UserDefinedItem UserDefinedItem { get; private set; }
 

DataLayer/Formatters.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace DataLayer
+{
+    internal class Formatters
+	{
+		private static string[] _sortPrefixIgnores { get; } = { "the", "a", "an" };
+
+		public static string GetSortName(string unformattedName)
+		{
+			var sortName = unformattedName
+				.Replace("|", "")
+				.Replace(":", "")
+				.ToLowerInvariant()
+				.Trim();
+
+			if (_sortPrefixIgnores.Any(prefix => sortName.StartsWith(prefix + " ")))
+				sortName = sortName
+					.Substring(sortName.IndexOf(" ") + 1)
+					.TrimStart();
+
+			return sortName;
+		}
+	}
+}

LibationWinForms/grid/GridEntry.cs

@@ -209,8 +209,8 @@ namespace LibationWinForms
 		/// </summary>
 		private Dictionary<string, Func<object>> CreateMemberValueDictionary() => new()
 		{
-			{ nameof(Title), () => GetSortName(Book.Title) },
+			{ nameof(Title), () => Book.TitleSortable },
-			{ nameof(Series), () => GetSortName(Book.SeriesNames) },
+			{ nameof(Series), () => Book.SeriesSortable },
 			{ nameof(Length), () => Book.LengthInMinutes },
 			{ nameof(MyRating), () => Book.UserDefinedItem.Rating.FirstScore },
 			{ nameof(PurchaseDate), () => LibraryBook.DateAdded },
@@ -234,21 +234,6 @@ namespace LibationWinForms
 			{ typeof(LiberatedStatus), new ObjectComparer<LiberatedStatus>() },
 		};
 
-		private static readonly string[] _sortPrefixIgnores = { "the", "a", "an" };
-		private static string GetSortName(string unformattedName)
-		{
-			var sortName = unformattedName
-				.Replace("|", "")
-				.Replace(":", "")
-				.ToLowerInvariant()
-				.Trim();
-
-			if (_sortPrefixIgnores.Any(prefix => sortName.StartsWith(prefix + " ")))
-				sortName = sortName.Substring(sortName.IndexOf(" ") + 1).TrimStart();
-
-			return sortName;
-		}
-
 		#endregion
 
 		#region Static library display functions