private void CreateConceptualNavigationProperty(EntityType entity, IAssociation association)
{
IEntity principalEntity;
IEntity dependentEntity;
bool isParentEntity;
string key;
string toRole;
string fromRole;
ResolveConceptualAssociationValues(association, out principalEntity, out dependentEntity, out isParentEntity, out key, out toRole, out fromRole);
//11/4/2012 If an entity has an association to itself then we will modify the key if it's the child association.
bool isSelfReferencingChild = !isParentEntity && principalEntity == dependentEntity;
if (!isSelfReferencingChild && !association.IsParentManyToMany())
{
var temp = fromRole;
fromRole = toRole;
toRole = temp;
}
// 11/4/2012 Updated to check to see if a self referencing entity exists then we check the too and from roles. By checking only the to and from roles if it's a self referencing this allows custom names to be picked up.
var navigationProperty = principalEntity == dependentEntity
? entity.NavigationProperties.FirstOrDefault(n => n.Relationship.Equals(String.Concat(ConceptualSchema.Namespace, ".", key)) && n.ToRole.Equals(toRole) && n.FromRole.Equals(fromRole))
: entity.NavigationProperties.FirstOrDefault(n => n.Relationship.Equals(String.Concat(ConceptualSchema.Namespace, ".", key)));
if (navigationProperty == null)
{
navigationProperty = new NavigationProperty() { Name = association.Name };
entity.NavigationProperties.Add(navigationProperty);
}
if (String.IsNullOrEmpty(navigationProperty.Name) || association.Name.StartsWith(navigationProperty.Name))
navigationProperty.Name = association.Name;
navigationProperty.Relationship = String.Concat(ConceptualSchema.Namespace, ".", key);
navigationProperty.FromRole = fromRole;
navigationProperty.ToRole = toRole;
}
private bool ValidateConceptualNavigationProperty(NavigationProperty nav)
{
var associationSet = ConceptualSchemaEntityContainer.AssociationSets.Where(a => a.Association == nav.Relationship).FirstOrDefault();
if (associationSet == null)
return false;
var association = ConceptualSchema.Associations.Where(a => a.Name == associationSet.Association.Replace(String.Concat(ConceptualSchema.Namespace, "."), "")).FirstOrDefault();
if (association == null)
return false;
var fromRoleEnd = association.Ends.Where(e => e.Role.Equals(nav.FromRole, StringComparison.OrdinalIgnoreCase)).FirstOrDefault();
var toRoleEnd = association.Ends.Where(e => e.Role.Equals(nav.ToRole, StringComparison.OrdinalIgnoreCase)).FirstOrDefault();
if (fromRoleEnd == null || toRoleEnd == null)
return false;
var isValidFromRoleEntity = ConceptualSchema.EntityTypes.Count(es => fromRoleEnd.Type.Replace(String.Concat(ConceptualSchema.Namespace, "."), "").Equals(es.Name, StringComparison.OrdinalIgnoreCase)) > 0;
var isValidToRoleEntity = ConceptualSchema.EntityTypes.Count(es => toRoleEnd.Type.Replace(String.Concat(ConceptualSchema.Namespace, "."), "").Equals(es.Name, StringComparison.OrdinalIgnoreCase)) > 0;
if (!isValidFromRoleEntity || !isValidToRoleEntity)
return false;
if (nav.FromRole.Equals(fromRoleEnd.Role, StringComparison.OrdinalIgnoreCase) && nav.ToRole.Equals(toRoleEnd.Role, StringComparison.OrdinalIgnoreCase))
return true;
return false;
}