What is loading in Entity Framework?

Eager loading is the process whereby a query for one type of entity also loads related entities as part of the query, so that we don’t need to execute a separate query for related entities. Eager loading is achieved using the Include() method.

How you can load related entities in EF?

Entity Framework supports three ways to load related data – eager loading, lazy loading and explicit loading.

What is eager loading in EF core?

Eager loading means that the related data is loaded from the database as part of the initial query. Explicit loading means that the related data is explicitly loaded from the database at a later time.

What is lazy loading in Entityframework?

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 is ICollection in Entity Framework?

ICollection interface represents a finite dynamic collection that are changeable, which means that exist items can be removed from the collection and new items can be added to the same collection. ICollection interface has the “Add” and “Remove” methods.

Which of the following is used for the eager loading with Entity Framework?

Entity Framework Core provides support for Eager Loading using the Include() extension method.

Which is better eager loading or lazy loading?

If you are not sure of what data is exactly needed, start with Lazy Loading and if it is leading to N + 1 problem then Eager Loading handles the data better.

Why do we use lazy loading in Entity Framework?

Lazy loading is delaying the loading of related data, until you specifically request for it. It is the opposite of eager loading. In the lazy loading, the context first loads the Student entity data from the database, then it will load the StudentAddress entity when we access the StudentAddress property as shown below.

How to lazy load related entities in Entity Framework?

In the following example, it loads the related entity Department, Employee Master and Detail. Console.WriteLine (“Eager Lading Example….”); Lazy Loading means delay loading the related entities.

How does eager loading work in Entity Framework?

In Eager Loading, all relevant data for an entity is loaded at the time of the query of the entity in the context object. Eager Loading can be done by using the “Include” method. To perform Eager Loading, Lazy Loading must be disabled. Lazy Loading is enabled by default in Entity Framework.

Is it possible to load multiple related entities?

It is also possible to eagerly load multiple levels of related entities. The queries below show examples of how to do this for both collection and reference navigation properties. It is not currently possible to filter which related entities are loaded. Include will always bring in all related entities.

What is a relationship in the Entity Framework?

Entity Framework – Relationships. In relational databases, relationship is a situation that exists between relational database tables through foreign keys. A Foreign Key (FK) is a column or combination of columns that is used to establish and enforce a link between the data in two tables.