protected internal override void OnQueryItemsCompleted(VirtualPage page, AsyncQueryInfo queryInfo, object[] fetchedItems)
{
DataGridVirtualizingQueryableCollectionView collectionView = this.CollectionView as DataGridVirtualizingQueryableCollectionView;
// The VirtualPageManager was Disposed
if (collectionView == null)
{
return;
}
using (collectionView.DeferRefresh())
{
base.OnQueryItemsCompleted(page, queryInfo, fetchedItems);
}
}
internal DataGridVirtualizingQueryableCollectionViewGroupRoot(
DataGridVirtualizingQueryableCollectionView collectionView,
object pageManagerSyncRoot,
bool isBottomLevel)
: base(null, -1, 0, null, -1, isBottomLevel)
{
m_parentCollectionView = collectionView;
m_queryableSource = m_parentCollectionView.QueryableSource;
if (m_queryableSource != null)
{
m_primaryKeyPropertyNames = m_queryableSource.FindPrimaryKeys();
// Primary key optimizations are only possible when only one primary key is identified in the source.
// When dealing with sources defining more than one primary key, we would need to know in which order
bool supportsPrimaryKeyOptimizations = ((m_primaryKeyPropertyNames != null) && (m_primaryKeyPropertyNames.Length == 1));
m_virtualPageManager = new DataGridLINQPageManager(collectionView,
pageManagerSyncRoot,
supportsPrimaryKeyOptimizations);
}
}
public DataGridLINQPageManager(DataGridVirtualizingQueryableCollectionView collectionView, object syncRoot, bool supportsPrimaryKeyOptimizations)
: base(collectionView)
{
m_supportsPrimaryKeyOptimizations = supportsPrimaryKeyOptimizations;
m_syncRoot = syncRoot;
}