private static void RemoveItemFromSourceCollection(IEnumerable <TItemSource> source, CollectionChangedArgs <TItemVM> args)
{
var listSource = source as IList <TItemSource>;
var collectionSource = source as ICollection <TItemSource>;
if (listSource != null)
{
bool listSourceHasChanged = !Object.ReferenceEquals(listSource[args.Index], args.OldItem.Source);
ThrowOutOfSyncExceptionIf(listSourceHasChanged);
listSource.RemoveAt(args.Index);
}
else if (collectionSource != null)
{
bool itemWasFound = collectionSource.Remove(args.OldItem.Source);
bool listSourceHasChanged = collectionSource.Count != args.Collection.Count;
ThrowOutOfSyncExceptionIf(!itemWasFound || listSourceHasChanged);
}
}
private static void SetItemInSourceCollection(IEnumerable <TItemSource> source, CollectionChangedArgs <TItemVM> args)
{
var listSource = source as IList <TItemSource>;
var collectionSource = source as ICollection <TItemSource>;
if (listSource != null)
{
bool listSourceHasChanged = !Object.Equals(listSource[args.Index], args.OldItem.Source);
ThrowOutOfSyncExceptionIf(listSourceHasChanged);
listSource[args.Index] = args.NewItem.Source;
}
else
{
if (collectionSource != null)
{
bool itemWasFound = collectionSource.Remove(args.OldItem.Source);
ThrowOutOfSyncExceptionIf(!itemWasFound);
collectionSource.Add(args.NewItem.Source);
}
}
if (collectionSource != null)
{
bool listSourceHasChanged = collectionSource.Count != args.Collection.Count;
ThrowOutOfSyncExceptionIf(listSourceHasChanged);
}
}
private static void InsertItemIntoSourceCollection(IEnumerable <TItemSource> source, CollectionChangedArgs <TItemVM> args)
{
var listSource = source as IList <TItemSource>;
var collectionSource = source as ICollection <TItemSource>;
if (listSource != null)
{
listSource.Insert(args.Index, args.NewItem.Source);
}
else
{
if (collectionSource != null)
{
collectionSource.Add(args.NewItem.Source);
}
}
if (collectionSource != null)
{
bool listSourceHasChanged = collectionSource.Count != args.Collection.Count;
ThrowOutOfSyncExceptionIf(listSourceHasChanged);
}
}
