/// <summary>
/// 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.
/// </summary>
/// <typeparam name="TTargetEntity"> The type of the entity at the other end of the relationship. </typeparam>
/// <param name="navigationPropertyExpression"> A lambda expression representing the navigation property
/// for the relationship. C#: t => t.MyProperty VB.Net: Function(t) t.MyProperty </param>
/// <returns> A configuration object that can be used to further configure the relationship. </returns>
public RequiredNavigationPropertyConfiguration <TEntityType, TTargetEntity> HasRequired <TTargetEntity>(
Expression <Func <TEntityType, TTargetEntity> > navigationPropertyExpression)
where TTargetEntity : class
{
if (navigationPropertyExpression == null)
{
throw new ArgumentNullException("navigationPropertyExpression");
}
var navigationProperty = ReflectionExpressions.GetPropertyInfo(navigationPropertyExpression);
IRequiredNavigationPropertyConfiguration propertyConfiguration;
if (!requiredAssociationsByProperty.TryGetValue(navigationProperty, out propertyConfiguration))
{
propertyConfiguration =
new RequiredNavigationPropertyConfiguration <TEntityType, TTargetEntity>(navigationProperty);
requiredAssociationsByProperty.Add(navigationProperty, propertyConfiguration);
}
return((RequiredNavigationPropertyConfiguration <TEntityType, TTargetEntity>)propertyConfiguration);
}
public RequiredNavigationPropertyConfigurationWrapper(RequiredNavigationPropertyConfiguration <TEntity, TTargetEntity> requiredNavigationPropertyConfiguration)
{
this.requiredNavigationPropertyConfiguration = requiredNavigationPropertyConfiguration;
}
