What’s the difference between .SaveChanges() and .AcceptAllChanges()?

In Entity Framework, both SaveChanges() and AcceptAllChanges() methods are related to managing changes and the state of entities within the DbContext. However, they serve different purposes:

1. SaveChanges():

  • SaveChanges() is a method of the DbContext class that is used to persist the changes made to entities in the database.
  • When you make changes to entities (e.g., add, update, delete), these changes are tracked by the DbContext‘s change tracker.
  • The SaveChanges() method is responsible for detecting the changes in the change tracker and persisting those changes to the underlying database in a single transaction.
  • It updates the database with the new data, creates new records, updates existing records, or deletes records as necessary based on the changes tracked by the context.
  • It returns the number of affected rows (the number of entities inserted, updated, or deleted) as an integer.

Usage Example:

using (var dbContext = new YourDbContext())
{
    // Perform changes to entities
    dbContext.SomeEntities.Add(newEntity);
    dbContext.OtherEntities.Update(existingEntity);

    // Save the changes to the database
    int rowsAffected = dbContext.SaveChanges();
}

2. AcceptAllChanges():

  • AcceptAllChanges() is a method of the DbContext class that is used after a successful call to SaveChanges().
  • When you call SaveChanges(), the change tracker is updated with the new state of entities in the database. After successful persistence, the entities in the context are considered to be in a “saved” state.
  • The AcceptAllChanges() method resets the change tracker, marking all entities in the context as “unchanged,” effectively clearing the tracked changes.
  • It is typically used after a successful save operation to indicate that all changes have been successfully persisted to the database, and the entities are now considered to be up-to-date with the database state.

Usage Example:

using (var dbContext = new YourDbContext())
{
    // Perform changes to entities
    dbContext.SomeEntities.Add(newEntity);
    dbContext.OtherEntities.Update(existingEntity);

    // Save the changes to the database
    int rowsAffected = dbContext.SaveChanges();

    // Accept the changes to mark entities as "unchanged"
    dbContext.AcceptAllChanges();
}

In summary, SaveChanges() is used to persist the changes to the database, while AcceptAllChanges() is used to reset the change tracker and mark entities as “unchanged” after successful persistence. The two methods are often used together in scenarios where you want to save changes to the database and then indicate that the entities are now in a “saved” state without any pending changes.

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