public class Order public Guid Id get; private set; private readonly List _orderItems = new(); public IReadOnlyCollection OrderItems => _orderItems.AsReadOnly(); public Money TotalPrice get; private set; public bool IsSubmitted get; private set; // Enforce creation rules via constructor public Order(Guid id, string currency) Id = id; TotalPrice = new Money(0, currency); IsSubmitted = false; // Business Invariant: Cannot add items to a finalized order public void AddItem(Guid productId, int quantity, Money price) if (IsSubmitted) throw new InvalidOperationException("Cannot modify a submitted order."); if (price.Currency != TotalPrice.Currency) throw new InvalidOperationException("Currency mismatch."); var existingItem = _orderItems.SingleOrDefault(i => i.ProductId == productId); if (existingItem != null) existingItem.IncreaseQuantity(quantity); else _orderItems.Add(new OrderItem(productId, quantity, price)); RecalculateTotal(); private void RecalculateTotal() decimal total = _orderItems.Sum(item => item.Price.Amount * item.Quantity); TotalPrice = new Money(total, TotalPrice.Currency); Use code with caution. 5. Avoiding Common Architectural Anti-Patterns
Implementing DDD successfully requires a dual approach: to map out the business architecture, and Tactical Design to build the actual code structure. Strategic Design: Mapping the Business Landscape implementing domain-driven design pdf github
Knowing where to find resources is only half the battle. Here are some strategies to effectively use these GitHub repositories to master DDD. public class Order public Guid Id get; private
The most reliable way to read the full book digitally. For a condensed version before diving into the
For a condensed version before diving into the 600-page "Red Book," many developers recommend Domain-Driven Design Distilled , also by Vaughn Vernon. 2013-Vaughn-Implementing Domain Driven Design.pdf - GitHub
Implementing decoupling and reactive systems.