How do you map a one to one relationship in Entity Framework?

We can configure one-to-one relation between Employee and EmployeeDetail using Fluent API by the following code in a model class:

protected override void OnModelCreating(DbModelBuildermodelBuilder)
{
modelBuilder. Entity < Customer > (). HasKey(p => p.
modelBuilder. Entity < Customer > (). HasOptional(e => e.
}

How do I create a one-to-many relationship in Entity Framework database first?

A one-to-many relationship happens when the primary key of one table becomes foreign keys in another table and also this primary key should participate in the primary key of the second table. In this relationship only zero, one, and more than one recordsare present on either side of tables.

How do you make relations in Entity Framework using DB First and Code First approach?

To understand the relationship in the Entity Framework Code First approach, we create an entity and define their configuration using the Fluent API….}

namespace EF.
{
public class UserProfile : BaseEntity.
{
public string FirstName { get; set; }
public string LastName { get; set; }

How do you implement many-to-many relationships in Entity Framework?

To configure many-to-many relationship Using Data Annotations, you need to create the Join Table in the model.

The Join Table BookCategory will have properties for the primary key of both the table.
It will have two navigational properties one each for Book and Category class.

How to configure relationships in Entity Framework designer?

To configure relationships using the Entity Framework Designer, see Relationships with the EF Designer. In a foreign key association, when you change the relationship, the state of a dependent object with an EntityState.Unchanged state changes to EntityState.Modified.

Which is an example of relationship mapping in EF?

My first example, where everybody can have any number of cars (meaning zero, one or more) and one car belongs to one person, can be specified in EF quite simply. Just modify your model classes: And that’s it 🙂 You already have your relationship set up. In the database, this is represented with foreign keys, of course.

How to specify foreign key in Entity Framework 6?

Now, if the Student entity does not follow the Id property convention for foreign key, then we can specify the name of the foreign key using the HasForeignKey method. .HasForeignKey (s => s.CurrentGradeId); specifies the foreign key property in the Student entity.

How to configure a one to many relationship?

Let’s configure a one-to-many relationship between the following Student and Grade entities where there can be many students in one grade. After implementing the one-to-many relationship in the above entities, the database tables for Student and Grade will look like below. The one-to-many relationship can be configured in the following ways.

How do you map a one to one relationship in Entity Framework? We can configure one-to-one relation between Employee and EmployeeDetail using Fluent API by the following code in a model class: protected override void OnModelCreating(DbModelBuildermodelBuilder) { modelBuilder. Entity < Customer > (). HasKey(p => p. modelBuilder. Entity < Customer > (). HasOptional(e => e.…