Entity Framework Core (EF Core) is a powerful open-source object-relational mapping (ORM) tool that simplifies database operations by allowing developers to interact with the database using object-oriented code. EF Core is designed to work seamlessly with .NET Core, enabling applications to perform CRUD (create, read, update, delete) operations without needing to worry about the underlying database structure or SQL queries. This abstraction makes it easier to manage data and focus on business logic rather than on how data is stored.
EF Core provides various methods to manage entities, including retrieving data from the database, adding new entities, updating existing ones, and deleting them. These methods work well in scenarios where the application is connected to the database throughout the interaction. However, real-world applications often require working with disconnected entities, where data might be retrieved from a database, modified in a different context, and then reattached to the context later, sometimes after the application has been closed or the database connection has been lost.
In these disconnected scenarios, EF Core’s ChangeTracker.TrackGraph method becomes essential. This method allows developers to work with disconnected entities by tracking the complete object graph, even if some parts of the graph were modified outside the current DbContext instance. Essentially, TrackGraph enables EF Core to reconnect an entity with its context, even after changes have been made while the entity was not being tracked, ensuring that any updates made to the entity can still be persisted back to the database when necessary.
In this article, we will dive into how the ChangeTracker.TrackGraph method works, showcasing how it can be used to manage disconnected entities efficiently. To follow along with the examples in this article, it’s recommended that you have Visual Studio 2022 installed on your system, as the code examples are demonstrated in this environment. If you don’t have Visual Studio 2022 yet, you can easily download it from the official website. By the end of this guide, you’ll have a solid understanding of how to manage disconnected entities and ensure their changes are properly tracked and saved back to the database.