Linq update list whilst looping through list [closed] - linq

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I have a list which is accessible as follows:
List<PingtreeNode> _pingtree;
IEnumerable<PingtreeNode> ActiveNodes
{
get { return _pingtree.Where(x => x.Status == PingtreeNodeStatus.Ready);}
}
I also have a method, who's job it is to iterate over some of the ActiveNodes where a RuleClass exists. For each of these nodes, a validation method is called and if the node is found to be invalid, a new PingtreeNodeStatus is set.
void ValidateBuyerRules()
{
var nodes = ActiveNodes.Where(x => x.RuleClass.IsNotNullOrEmpty());
foreach (var n in nodes)
{
var isValid = NewRuleSet(n.RuleClass).Validate(_appForm);
if (!isValid) n.Status = PingtreeNodeStatus.FailedCritera;
}
}
One of the properties of PingtreeNode is 'Product', and a product can exists several times within the list ActiveNodes.
What I want to do is this. If isValid is true for a product, I need to set all subsequent nodes containing the same Product to a PingtreeNodeStatus.FailedCriteria. In other words ignore them further down the nodes list and don't perform validation on them.
I know how to iterate through the loop and do this but am concerned about updating a list whilst already being inside the list. Is there a safe way of achieving this?

Answer 1

It's not possible to update a list while iterating over it, however that's not what you're doing.
You're not modifying the list but properties of the items in the list, this is perfectly safe.