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LightlessAPI/LightlessSyncAPI/Data/Comparer/UserDtoComparer.cs

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+using LightlessSync.API.Dto.User;
+
+namespace LightlessSync.API.Data.Comparer;
+
+public class UserDtoComparer : IEqualityComparer<UserDto>
+{
+    private static UserDtoComparer _instance = new();
+
+    private UserDtoComparer()
+    { }
+
+    public static UserDtoComparer Instance => _instance;
+
+    public bool Equals(UserDto? x, UserDto? y)
+    {
+        if (x == null || y == null) return false;
+        return x.User.UID.Equals(y.User.UID, StringComparison.Ordinal);
+    }
+
+    public int GetHashCode(UserDto obj)
+    {
+        return obj.User.UID.GetHashCode();
+    }
+}