public List <Node> GetNodes(int courseId, int?parentId)
{
try
{
db.ClearCache();
Course course = db.Courses.SingleOrDefault(c => c.Id == courseId);
List <Node> nodes = course.Nodes.OrderBy(n => n.Position).ToList();
if (parentId == null)
{
nodes = nodes.Where(n => n.ParentId == null).ToList();
}
else
{
nodes = nodes.Where(n => n.ParentId == parentId).ToList();
}
return(nodes);
}
catch (Exception)
{
return(new List <Node>());
}
}
