public void UpdateBy(IEnumerable <KeyValuePair <TKey, TItem> > source)
{
foreach (var kvp in source)
{
TItem currentValue;
if (currentValues.TryGetValue(kvp.Key, out currentValue))
{
if (currentValue.Equals(kvp.Value) == false)
{
currentValues[kvp.Key] = kvp.Value;
OnUpdated.Raise(kvp.Key, kvp.Value);
}
}
else
{
currentValues[kvp.Key] = kvp.Value;
OnAdded.Raise(kvp.Key, kvp.Value);
}
}
var keysRemoved = currentValues.Keys.Except(source.Select(kvp => kvp.Key)).ToArray();
foreach (var keyRemoved in keysRemoved)
{
OnRemoved.Raise(keyRemoved, currentValues[keyRemoved]);
currentValues.Remove(keyRemoved);
}
}