Cascade deleting with EF Core

Cascade deleting with EF Core

In Entity Framework Core, you can configure cascade deleting to automatically delete related entities when the primary entity is deleted. This can simplify your code and ensure data consistency.

Here's an example of how to set up cascade deleting in EF Core:

  • Define your entities: Define your entities and relationships as usual, using the HasMany and HasForeignKey methods to specify the relationships between entities.
public class Order { public int OrderId { get; set; } public string OrderNumber { get; set; } public int CustomerId { get; set; } public Customer Customer { get; set; } } public class Customer { public int CustomerId { get; set; } public string Name { get; set; } public List<Order> Orders { get; set; } }

In this example, the Order entity has a foreign key to the Customer entity, and the Customer entity has a collection of orders.

  • Configure cascade deleting: In the OnModelCreating method of your DbContext class, use the OnDelete method to specify how you want to handle cascade deleting.
protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<Order>() .HasOne(o => o.Customer) .WithMany(c => c.Orders) .HasForeignKey(o => o.CustomerId) .OnDelete(DeleteBehavior.Cascade); }

In this example, the OnDelete method is used to specify DeleteBehavior.Cascade, which means that when a Customer entity is deleted, all related Order entities will be deleted as well.

  • Use cascade deleting: In your code, you can now delete a Customer entity and all related Order entities will be deleted automatically.
using (var context = new MyDbContext()) { var customer = context.Customers.Find(customerId); context.Customers.Remove(customer); context.SaveChanges(); }

In this example, the Customer entity with the specified customerId is deleted, and all related Order entities are deleted automatically due to cascade deleting.

Note that cascade deleting can be a powerful tool, but it should be used with care. Always test your code thoroughly and make sure that you understand the potential impact of cascade deleting on your data.

Examples

  1. "EF Core cascade delete one-to-many"

    • Code:
      modelBuilder.Entity<ParentEntity>() .HasMany(p => p.ChildEntities) .WithOne(c => c.Parent) .OnDelete(DeleteBehavior.Cascade);
    • Description: Configures cascade delete for a one-to-many relationship in Entity Framework Core.

  2. "EF Core cascade delete many-to-many"

    • Code:
      modelBuilder.Entity<ParentEntity>() .HasMany(p => p.ChildEntities) .WithMany(c => c.ParentEntities) .OnDelete(DeleteBehavior.Cascade);
    • Description: Sets up cascade delete for a many-to-many relationship in EF Core.

  3. "EF Core cascade delete one-to-one"

    • Code:
      modelBuilder.Entity<ParentEntity>() .HasOne(p => p.ChildEntity) .WithOne(c => c.Parent) .OnDelete(DeleteBehavior.Cascade);
    • Description: Configures cascade delete for a one-to-one relationship in EF Core.

  4. "EF Core cascade delete dependent entities"

    • Code:
      modelBuilder.Entity<PrincipalEntity>() .HasMany(p => p.DependentEntities) .WithOne(d => d.Principal) .OnDelete(DeleteBehavior.Cascade);
    • Description: Specifies cascade delete for dependent entities in a principal-dependent relationship.

  5. "EF Core disable cascade delete"

    • Code:
      modelBuilder.Entity<ParentEntity>() .HasMany(p => p.ChildEntities) .WithOne(c => c.Parent) .OnDelete(DeleteBehavior.Restrict);
    • Description: Disables cascade delete for a one-to-many relationship, opting for restrict instead.

  6. "EF Core cascade delete soft delete"

    • Code:
      modelBuilder.Entity<ParentEntity>() .HasMany(p => p.ChildEntities) .WithOne(c => c.Parent) .OnDelete(DeleteBehavior.ClientSetNull);
    • Description: Implements a soft delete scenario by setting related foreign keys to null instead of deleting.

  7. "EF Core cascade delete multiple levels"

    • Code:
      modelBuilder.Entity<GrandparentEntity>() .HasMany(g => g.ParentEntities) .WithOne(p => p.Grandparent) .OnDelete(DeleteBehavior.Cascade);
    • Description: Configures cascade delete across multiple levels of entities.

  8. "EF Core cascade delete self-referencing"

    • Code:
      modelBuilder.Entity<SelfReferencingEntity>() .HasMany(s => s.Children) .WithOne(s => s.Parent) .OnDelete(DeleteBehavior.Cascade);
    • Description: Sets up cascade delete for a self-referencing entity.

  9. "EF Core cascade delete composite key"

    • Code:
      modelBuilder.Entity<ParentEntity>() .HasMany(p => p.ChildEntities) .WithOne(c => c.Parent) .HasForeignKey(c => new { c.ParentId1, c.ParentId2 }) .OnDelete(DeleteBehavior.Cascade);
    • Description: Configures cascade delete for entities with a composite key.

  10. "EF Core cascade delete circular references"

    • Code:
      modelBuilder.Entity<EntityA>() .HasMany(a => a.EntitiesB) .WithOne(b => b.EntityA) .OnDelete(DeleteBehavior.Cascade); modelBuilder.Entity<EntityB>() .HasMany(b => b.EntitiesA) .WithOne(a => a.EntityB) .OnDelete(DeleteBehavior.Cascade);
    • Description: Handles cascade delete in scenarios with circular references between entities.

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