private void InvokeChanged(OptionsItemChangedEventArgs <TKey, TOptionsItem> args)
{
if (OnItemChange != null)
{
OnItemChange?.Invoke(args);
}
}
private void OnChanged(TOptions newInstance)
{
_logger.LogInformation("Change detected for options, diffing items.");
// calculate which items are new, modified, or removed since last time.
// We should lock in case this fires concurrently on differetn threads and a key gets added?
foreach (var itemsEnumerable in _itemAccessors)
{
var changes = _differ.GetChanges(_instance, newInstance, itemsEnumerable.GetItems).ToList();
if (!changes.Any())
{
continue;
}
var changeDictionary = new Dictionary <ItemChangeType, List <TOptionsItem> >();
var adds = new List <TOptionsItem>();
var updates = new List <TOptionsItem>();
var deletes = new List <TOptionsItem>();
changeDictionary.Add(ItemChangeType.Added, adds);
changeDictionary.Add(ItemChangeType.Modified, updates);
changeDictionary.Add(ItemChangeType.Removed, deletes);
foreach (var item in changes)
{
switch (item.Item2)
{
case ItemChangeType.Added:
adds.Add(item.Item1);
continue;
case ItemChangeType.Modified:
updates.Add(item.Item1);
continue;
case ItemChangeType.Removed:
deletes.Add(item.Item1);
continue;
}
}
var args = new OptionsItemChangedEventArgs <TKey, TOptionsItem>()
{
MemberName = itemsEnumerable.MemberName,
Changes = changeDictionary
};
InvokeChanged(args);
}
_instance = newInstance;
}
public void OnItemChange(OptionsItemChangedEventArgs <TKey, TOptionsItem> args) => _listener.Invoke(args);