Using PersonContainer for PersonDisplayDirectoryName

Shared/Models/PersonContainer.cs

@@ -40,6 +40,18 @@ public record PersonContainer(int? ApproximateYears,
     public static bool? IsKeyIsMaxBirthday(PersonContainer personContainer) =>
         personContainer.Birthdays is null || personContainer.Key is null ? null : personContainer.Key.Value == personContainer.Birthdays.First().Value.Ticks;
 
+    public static ReadOnlyDictionary<long, PersonContainer> Extract(ReadOnlyCollection<PersonContainer> personContainers)
+    {
+        Dictionary<long, PersonContainer> results = [];
+        foreach (PersonContainer personContainer in personContainers)
+        {
+            if (personContainer.Key is null || results.ContainsKey(personContainer.Key.Value))
+                continue;
+            results.Add(personContainer.Key.Value, personContainer);
+        }
+        return results.AsReadOnly();
+    }
+
 }
 
 [JsonSourceGenerationOptions(WriteIndented = true, DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull)]

Shared/Models/PersonKeyFormattedAndPersonKeyTicks.cs

@@ -3,7 +3,9 @@ using System.Text.Json.Serialization;
 
 namespace View_by_Distance.Shared.Models;
 
-public record PersonKeyFormattedAndKeyTicksAndDisplayDirectoryName(string KeyFormatted, long KeyTicks, string? DisplayDirectoryName)
+public record PersonKeyFormattedAndKeyTicksAndDisplayDirectoryName(string KeyFormatted,
+                                                                   long KeyTicks,
+                                                                   string? DisplayDirectoryName)
 {
 
     public override string ToString()