/// <summary>
/// Configures the referential constraint with the dependent and principal property pair.
/// </summary>
/// <param name="constraint">The dependent and principal property pair.</param>
public NavigationPropertyConfiguration HasConstraint(KeyValuePair <PropertyInfo, PropertyInfo> constraint)
{
if (constraint.Key == null)
{
throw Error.ArgumentNull("dependentPropertyInfo");
}
if (constraint.Value == null)
{
throw Error.ArgumentNull("principalPropertyInfo");
}
if (Multiplicity == EdmMultiplicity.Many)
{
throw Error.NotSupported(SRResources.ReferentialConstraintOnManyNavigationPropertyNotSupported,
Name, DeclaringType.ClrType.FullName);
}
if (ValidateConstraint(constraint))
{
return(this);
}
EntityTypeConfiguration principalEntity = DeclaringType.ModelBuilder.StructuralTypes
.OfType <EntityTypeConfiguration>().FirstOrDefault(e => e.ClrType == RelatedClrType);
Contract.Assert(principalEntity != null);
PrimitivePropertyConfiguration principal = principalEntity.AddProperty(constraint.Value);
PrimitivePropertyConfiguration dependent = DeclaringType.AddProperty(constraint.Key);
// If the navigation property on which the referential constraint is defined or the principal property
// is nullable, then the dependent property MUST be nullable.
if (Multiplicity == EdmMultiplicity.ZeroOrOne || principal.NullableProperty)
{
dependent.NullableProperty = true;
}
// If both the navigation property and the principal property are not nullable,
// then the dependent property MUST be marked with the Nullable="false" attribute value.
if (Multiplicity == EdmMultiplicity.One && !principal.NullableProperty)
{
dependent.NullableProperty = false;
}
_referentialConstraint.Add(constraint);
return(this);
}
