implement a aggregate root for basket in csharp

To implement an aggregate root for a basket in C#, you can follow the domain-driven design approach, where an aggregate root is defined as an entity that encapsulates other related entities and enforces transactional consistency boundaries between them. In the case of a basket, we can define it as the aggregate root that encapsulates the items that are being added, removed or checked out from the basket.

Here's an example implementation using Entity Framework:


main.cs
// Define the basket entity
public class Basket
{
    public int Id { get; set; }
    public ICollection<BasketItem> Items { get; set; } = new List<BasketItem>();

    // Add an item to the basket
    public void AddItem(BasketItem item)
    {
        // Validation rules can be enforced here
        Items.Add(item);
    }

    // Remove an item from the basket
    public void RemoveItem(BasketItem item)
    {
        // Validation rules can be enforced here
        Items.Remove(item);
    }

    // Check out the basket
    public void CheckOut()
    {
        // Validation rules can be enforced here
        // Perform the necessary operations to complete the checkout process
    }
}

// Define the basket item entity
public class BasketItem
{
    public int Id { get; set; }
    public int BasketId { get; set; }
    public int ProductId { get; set; }
    public int Quantity { get; set; }
    public decimal Price { get; set; }
}

// Define the DbContext for Entity Framework
public class BasketDbContext : DbContext
{
    public DbSet<Basket> Baskets { get; set; }
    public DbSet<BasketItem> BasketItems { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Basket>()
            .HasMany(b => b.Items)
            .WithOne()
            .OnDelete(DeleteBehavior.Cascade);
    }
}

// Example usage
using (var context = new BasketDbContext())
{
    var basket = new Basket();
    var item = new BasketItem { ProductId = 1, Quantity = 2, Price = 10.00 };
    basket.AddItem(item);

    context.Baskets.Add(basket);
    context.SaveChanges();

    basket.RemoveItem(item);
    context.SaveChanges();

    basket.CheckOut();
    context.SaveChanges();
}
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In this example, we defined the Basket entity as the aggregate root that encapsulates a collection of BasketItem entities. The Basket entity has methods to add, remove or check out items, and validation rules can be enforced in these methods. The BasketItem entity holds the product, quantity and price information for each item in the basket.

The BasketDbContext class defines the Entity Framework mappings for the Basket and BasketItem entities, and includes a cascade delete behavior that removes all related items when a basket is deleted.

Finally, we have an example usage that creates a new basket, adds an item, removes it and checks out the basket using the basket instance and the BasketDbContext context.

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