/// <summary>
/// Creates new data instance and copies data from this collection to the new one.
/// </summary>
/// <returns>
/// New data instance and copies data from this collection to the new one.
/// </returns>
public TrackingSnapshotDataAssociativeContainer Copy()
{
TrackingSnapshotDataAssociativeContainer data = new TrackingSnapshotDataAssociativeContainer();
data.IndexData = IndexData.Copy();
data.tracker = new ChangeTracker <IReadOnlySnapshotData>(data.DataId, data, this.tracker);
return(data);
}