private object InstantiateAndAttachEntity(EntityType entityType, DbContext context)
{
Type clrType = EntityTypeExtensions.GetClrType(entityType);
DbSet set = context.Set(clrType);
object entity = this.InstantiateEntity(entityType, context, clrType, set);
ModificationCommandTreeGenerator.SetFakeReferenceKeyValues(entity, entityType);
ModificationCommandTreeGenerator.SetFakeKeyValues(entity, entityType);
set.Attach(entity);
return(entity);
}
private void ChangeRelationshipStates(
DbContext context,
EntityType entityType,
object entity,
EntityState state)
{
ObjectStateManager objectStateManager = ((IObjectContextAdapter)context).ObjectContext.ObjectStateManager;
foreach (AssociationType associationType in this._metadataWorkspace.GetItems <AssociationType>(DataSpace.CSpace).Where <AssociationType>((Func <AssociationType, bool>)(at =>
{
if (at.IsForeignKey || at.IsManyToMany())
{
return(false);
}
if (!at.SourceEnd.GetEntityType().IsAssignableFrom((EdmType)entityType))
{
return(at.TargetEnd.GetEntityType().IsAssignableFrom((EdmType)entityType));
}
return(true);
})))
{
AssociationEndMember principalEnd;
AssociationEndMember dependentEnd;
if (!associationType.TryGuessPrincipalAndDependentEnds(out principalEnd, out dependentEnd))
{
principalEnd = associationType.SourceEnd;
dependentEnd = associationType.TargetEnd;
}
if (dependentEnd.GetEntityType().IsAssignableFrom((EdmType)entityType))
{
EntityType entityType1 = principalEnd.GetEntityType();
Type clrType = EntityTypeExtensions.GetClrType(entityType1);
DbSet set = context.Set(clrType);
object obj1 = set.Local.Cast <object>().SingleOrDefault <object>();
if (obj1 == null || object.ReferenceEquals(entity, obj1) && state == EntityState.Added)
{
obj1 = this.InstantiateEntity(entityType1, context, clrType, set);
ModificationCommandTreeGenerator.SetFakeReferenceKeyValues(obj1, entityType1);
set.Attach(obj1);
}
if (principalEnd.IsRequired() && state == EntityState.Modified)
{
object obj2 = this.InstantiateEntity(entityType1, context, clrType, set);
ModificationCommandTreeGenerator.SetFakeKeyValues(obj2, entityType1);
set.Attach(obj2);
objectStateManager.ChangeRelationshipState(entity, obj2, associationType.FullName, principalEnd.Name, EntityState.Deleted);
}
objectStateManager.ChangeRelationshipState(entity, obj1, associationType.FullName, principalEnd.Name, state == EntityState.Deleted ? state : EntityState.Added);
}
}
}
