Скачать или смотреть How to Implement Cascade Delete in EF Core for Multiple Foreign Keys

Learn how to configure and implement cascade delete in Entity Framework Core (EF Core) for multiple foreign keys in your database using C# and SQL Server.
---
Disclaimer/Disclosure: Some of the content was synthetically produced using various Generative AI (artificial intelligence) tools; so, there may be inaccuracies or misleading information present in the video. Please consider this before relying on the content to make any decisions or take any actions etc. If you still have any concerns, please feel free to write them in a comment. Thank you.
---
How to Implement Cascade Delete in EF Core for Multiple Foreign Keys

Working with Entity Framework Core (EF Core), one common requirement is to have related data in your database automatically removed when a parent entity is deleted. This is known as Cascade Delete. EF Core makes it relatively straightforward to configure cascade delete, even when dealing with multiple foreign keys. Here's how you can implement this in your applications.

Setting Up Your Models

First, let's define our models. Imagine you have a Parent entity that can have multiple related Child entities. Additionally, the Child entity could also have another foreign key, say Category.

[[See Video to Reveal this Text or Code Snippet]]

In this example, Child has two foreign keys: ParentId and CategoryId.

Configuring Cascade Delete in the DbContext

You need to configure cascade delete behavior in your DbContext configuration. This can be achieved in the OnModelCreating method.

[[See Video to Reveal this Text or Code Snippet]]

In the above configuration:

When a Parent entity is deleted, all related Child entities will also be deleted.

Similarly, when a Category entity is deleted, it will also delete related Child entities.

Applying the Migrations

Once your models and configurations are set, you need to apply the changes to your database:

[[See Video to Reveal this Text or Code Snippet]]

This will create the necessary migrations and update your database schema accordingly.

Verifying Cascade Delete Configuration

To verify the cascade delete behavior, you can write some tests or perform CRUD operations and observe the effect of deletions.

[[See Video to Reveal this Text or Code Snippet]]

When parent and category entities are deleted, their related child entities should also be automatically deleted due to the cascade delete configuration.

Conclusion

Implementing cascade delete in EF Core for multiple foreign keys is a crucial aspect for maintaining referential integrity in your database. By carefully configuring your entity relationships and setting up appropriate delete behaviors, you can ensure your application's data remains consistent and free of orphaned records.

By following the steps above, you can enable cascade delete for multiple foreign keys in your EF Core applications, making your data management tasks more efficient and reliable.