public void UpdateNow()
{
if (_provider.IsCollection)
{
_depValue.OnGet();
// Create a list of new items.
List <CollectionItem> items = new List <CollectionItem>();
// Dump all previous items into a recycle bin.
using (RecycleBin <CollectionItem> bin = new RecycleBin <CollectionItem>())
{
foreach (object oldItem in _collection)
{
bin.AddObject(new CollectionItem(_collection, oldItem, true));
}
// Add new objects to the list.
if (_sourceCollection != null)
{
foreach (object obj in _sourceCollection)
{
items.Add(bin.Extract(new CollectionItem(_collection, WrapValue(obj), false)));
}
}
_sourceCollection = null;
// All deleted items are removed from the collection at this point.
}
// Ensure that all items are added to the list.
int index = 0;
foreach (CollectionItem item in items)
{
item.EnsureInCollection(index);
++index;
}
}
else
{
object oldValue = _value;
_depValue.OnGet();
object newValue = _value;
if (_initialized)
{
if ((!Object.Equals(newValue, oldValue)))
{
_wrapper.FirePropertyChanged(_propertyInfo.Name);
}
}
else
{
_initialized = true;
}
}
}
