Style: C# 12 Primary constructor

src/Domain/Common/BaseEntity.cs

@@ -8,10 +8,10 @@ public abstract class BaseEntity
     // Using non-generic integer types for simplicity
     public int Id { get; set; }
 
-    private readonly List<BaseEvent> _domainEvents = new();
+    private readonly List<BaseEvent> _domainEvents = [];
 
     [NotMapped]
-    public IReadOnlyCollection<BaseEvent> DomainEvents => _domainEvents.AsReadOnly();
+    public IEnumerable<BaseEvent> DomainEvents => _domainEvents.AsReadOnly();
 
     public void AddDomainEvent(BaseEvent domainEvent)
     {

src/Domain/Common/ValueObject.cs

@@ -3,7 +3,7 @@
 // Learn more: https://docs.microsoft.com/en-us/dotnet/standard/microservices-architecture/microservice-ddd-cqrs-patterns/implement-value-objects
 public abstract class ValueObject
 {
-    protected static bool EqualOperator(ValueObject left, ValueObject right)
+    private static bool EqualOperator(ValueObject left, ValueObject right)
     {
         if (left is null ^ right is null)
         {

src/Domain/Events/TodoItemCompletedEvent.cs

@@ -1,11 +1,8 @@
 namespace Hutopy.Domain.Events;
 
-public class TodoItemCompletedEvent : BaseEvent
+public class TodoItemCompletedEvent(
+    TodoItem item) 
+    : BaseEvent
 {
-    public TodoItemCompletedEvent(TodoItem item)
-    {
-        Item = item;
-    }
-
-    public TodoItem Item { get; }
+    public TodoItem Item { get; } = item;
 }

src/Domain/Events/TodoItemCreatedEvent.cs

@@ -1,11 +1,8 @@
 namespace Hutopy.Domain.Events;
 
-public class TodoItemCreatedEvent : BaseEvent
+public class TodoItemCreatedEvent(
+    TodoItem item) 
+    : BaseEvent
 {
-    public TodoItemCreatedEvent(TodoItem item)
-    {
-        Item = item;
-    }
-
-    public TodoItem Item { get; }
+    public TodoItem Item { get; } = item;
 }

src/Domain/Events/TodoItemDeletedEvent.cs

@@ -1,11 +1,8 @@
 namespace Hutopy.Domain.Events;
 
-public class TodoItemDeletedEvent : BaseEvent
+public class TodoItemDeletedEvent(
+    TodoItem item) 
+    : BaseEvent
 {
-    public TodoItemDeletedEvent(TodoItem item)
-    {
-        Item = item;
-    }
-
-    public TodoItem Item { get; }
+    public TodoItem Item { get; } = item;
 }

src/Domain/Exceptions/UnsupportedColourException.cs

@@ -1,9 +1,4 @@
 namespace Hutopy.Domain.Exceptions;
 
-public class UnsupportedColourException : Exception
-{
-    public UnsupportedColourException(string code)
-        : base($"Colour \"{code}\" is unsupported.")
-    {
-    }
-}
+public class UnsupportedColourException(
+    string code) : Exception($"Colour \"{code}\" is unsupported.");

src/Domain/ValueObjects/Colour.cs

@@ -47,7 +47,7 @@ public class Colour(string code) : ValueObject
         return Code;
     }
 
-    protected static IEnumerable<Colour> SupportedColours
+    private static IEnumerable<Colour> SupportedColours
     {
         get
         {