protected override void InterceptMethod(IInvocation invocation, IHasParent withParent)
{
Type collectionType = invocation.Method.DeclaringType;
if (collectionType.IsEnumerable() && invocation.Arguments.Length == 1)
{
IChangeTrackableCollection trackableCollection = (IChangeTrackableCollection)withParent;
IChangeTrackableObject changedItem =
invocation.Arguments[0] as IChangeTrackableObject
?? TrackableObjectFactory.CreateFrom(invocation.Arguments[0]) as IChangeTrackableObject;
IEnumerable <object> currentItems;
Type collectionItemType = withParent.GetCollectionItemType();
bool itemsAreKeyValuePair = collectionItemType.GetTypeInfo().IsGenericType&& collectionItemType == typeof(KeyValuePair <,>).MakeGenericType(collectionItemType.GenericTypeArguments);
if (itemsAreKeyValuePair)
{
currentItems = ((IEnumerable)withParent).Cast <object>();
}
else
{
currentItems = ((IEnumerable <object>)withParent).ToList();
}
invocation.Arguments[0] = changedItem ?? invocation.Arguments[0];
invocation.Proceed();
KeyValuePair <Type, CollectionImplementation> implementation =
Configuration.Collections.GetImplementation(collectionType);
CollectionChangeContext changeContext = new CollectionChangeContext
(
!itemsAreKeyValuePair ? (IEnumerable <object>)trackableCollection : Enumerable.Empty <object>(),
currentItems,
trackableCollection.ParentObjectProperty,
trackableCollection.AddedItems,
trackableCollection.RemovedItems
);
if (!itemsAreKeyValuePair)
{
Activator.CreateInstance(implementation.Value.ChangeInterceptor.MakeGenericType(trackableCollection.GetCollectionItemType()), changeContext)
.CallMethod(invocation.Method.Name, invocation.Arguments);
}
switch (changeContext.Change)
{
case CollectionChange.Add:
trackableCollection.RaiseCollectionChanged(NotifyCollectionChangedAction.Add, new[] { changedItem });
break;
case CollectionChange.Remove:
trackableCollection.RaiseCollectionChanged(NotifyCollectionChangedAction.Remove, new[] { changedItem });
break;
}
}
else
{
invocation.Proceed();
}
}
