EntityTypeConfiguration<TEntityType>.HasRequired<TTargetEntity> Method (Expression<Func<TEntityType, TTargetEntity>>)
Configures a required relationship from this entity type. Instances of the entity type will not be able to be saved to the database unless this relationship is specified. The foreign key in the database will be non-nullable.
Assembly: EntityFramework (in EntityFramework.dll)
[SuppressMessageAttribute("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] [SuppressMessageAttribute("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")] public RequiredNavigationPropertyConfiguration<TEntityType, TTargetEntity> HasRequired<TTargetEntity>( Expression<Func<TEntityType, TTargetEntity>> navigationPropertyExpression ) where TTargetEntity : class
Parameters
- navigationPropertyExpression
-
Type:
System.Linq.Expressions.Expression<Func<TEntityType, TTargetEntity>>
A lambda expression representing the navigation property for the relationship. C#: t => t.MyProperty VB.Net: Function(t) t.MyProperty
Return Value
Type: System.Data.Entity.ModelConfiguration.Configuration.RequiredNavigationPropertyConfiguration<TEntityType, TTargetEntity>A configuration object that can be used to further configure the relationship.
Type Parameters
- TTargetEntity
The type of the entity at the other end of the relationship.