public static void SynchronizeToView <T>(this IEnumerable <T> sourceCollection, ObservableCollection <T> targetView, Func <T, bool> filterFunc, CollectionSynchronizationMode mode, bool disposeRemovedItems = false)
{
var qualifyingItems = sourceCollection.Where(filterFunc).ToList();
// Remove non-qualifying items from target.
foreach (var i in targetView.Except(qualifyingItems).ToArray())
{
targetView.Remove(i);
if (disposeRemovedItems && i is IDisposable disposableItem)
{
disposableItem.Dispose();
}
}
// Add qualifying items to target.
for (var sourceIndex = 0; sourceIndex < qualifyingItems.Count; sourceIndex++)
{
var sourceItem = qualifyingItems[sourceIndex];
var targetIndex = targetView.IndexOf(sourceItem);
if (!targetView.Contains(sourceItem))
{
targetView.Insert(sourceIndex, sourceItem);
}
else if (targetIndex > sourceIndex)
{
// Maintain source order in target if so instructed.
if (mode == CollectionSynchronizationMode.KeepOrderByMove)
{
targetView.Move(targetIndex, sourceIndex);
}
else if (mode == CollectionSynchronizationMode.KeepOrderByRemoveInsert)
{
targetView.Remove(sourceItem);
targetView.Insert(sourceIndex, sourceItem);
}
}
}
}
public static void SynchronizeToView <T>(this IEnumerable <T> sourceCollection, ObservableCollection <T> targetView, CollectionSynchronizationMode mode, bool disposeRemovedItems = false)
{
SynchronizeToView(sourceCollection, targetView, i => true, mode, disposeRemovedItems);
}
