What is a collection method in Entity Framework?

What is a collection method in Entity Framework?

The Reference() method is used to get an object of the specified reference navigation property and the Load() method loads it explicitly. Load() loads the collection navigation property Courses of the Student entity. The Collection() method gets an object that represents the collection navigation property.

Which of the following method of DbContext is used to save entities to the database?

SaveChanges() Saves all changes made in this context to the database. This method will automatically call DetectChanges() to discover any changes to entity instances before saving to the underlying database.

Is lazy loading enabled by default in Entity Framework Core?

The advice is not to use lazy loading unless you are certain that it is the better solution. This is why (unlike in previous versions of EF) lazy loading is not enabled by default in Entity Framework Core.

How lazy loading works in Entity Framework?

Lazy loading is the process whereby an entity or collection of entities is automatically loaded from the database the first time that a property referring to the entity/entities is accessed. Lazy loading means delaying the loading of related data, until you specifically request for it.

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

The AcceptAllChanges method is useful in the scenario where a transaction has failed and a user wants to retry. If you call SaveChanges() or SaveChanges(true),the EF simply assumes that if its work completes okay, everything is okay, so it will discard the changes it has been tracking, and wait for new changes.

How to load a related entity in EF?

With eager loading, EF loads related entities as part of the initial database query. To perform eager loading, use the System.Data.Entity.Include extension method. This tells EF to include the Author data in the query. If you make this change and run the app, now the JSON data looks like this:

How to apply filters when explicitly loading related entities?

Applying filters when explicitly loading related entities The Query method provides access to the underlying query that Entity Framework will use when loading related entities. You can then use LINQ to apply filters to the query before executing it with a call to a LINQ extension method such as ToList, Load, etc.

When to use reference method or collection method?

The Reference method should be used when an entity has a navigation property to another single entity. On the other hand, the Collection method should be used when an entity has a navigation property to a collection of other entities. Applying filters when explicitly loading related entities

How to eagerly load related entities in Microsoft Docs?

Eager loading is achieved by use of the Include method. For example, the queries below will load blogs and all the posts related to each blog. Include is an extension method in the System.Data.Entity namespace so make sure you are using that namespace. It is also possible to eagerly load multiple levels of related entities.