Contents
How do you create a one-to-many relationship in EF core?
The easiest way to configure a one-to-many relationship is by convention. EF Core will create a relationship if an entity contains a navigation property. Therefore, the minimum required for a relationship is the presence of a navigation property in the principal entity: public class Author.
How do I create a one-to-many relationship in Entity Framework database first?
Code First Conventions
- Add Collection Navigation Property. You can achieve one-to-many relationship by adding the collection navigation property of Book entity in the Author entity class.
- Add Navigation Properties in Both Entities.
- Fully Defined Relationship.
How do I seed data in EF core?
Data seeding is the process of populating a database with an initial set of data. There are several ways this can be accomplished in EF Core: Model seed data. Manual migration customization.
What is principal key?
Principal key: The properties that uniquely identify the principal entity. This may be the primary key or an alternate key. Foreign key: The properties in the dependent entity that are used to store the principal key values for the related entity.
What is the difference between ICollection and list?
Here’s the difference between the interfaces: IEnumerable is read-only. You can add and remove items to an ICollection You can do random access (by index) to a List
How do I migrate to EF Core?
Migrations are enabled by default in EF Core. They are managed by executing commands. If you have Visual Studio, you can use the Package Manager Console (PMC) to manage migrations. Alternatively, you can use a command line tool to execute Entity Framework CLI commands to create a migration.
What is DbContext C#?
A DbContext instance represents a combination of the Unit Of Work and Repository patterns such that it can be used to query from a database and group together changes that will then be written back to the store as a unit. DbContext is conceptually similar to ObjectContext.