/// <summary>
/// Gets all <see cref="DataRegion"/>s that are <em>not</em> stored in
/// this <see cref="DataRegionSet"/> within a specific boundary <see cref="DataRegion"/>.
/// </summary>
/// <param name="boundaryRegion">The boundary <see cref="DataRegion"/>.</param>
/// <returns>All <see cref="DataRegion"/>s within the <paramref name="boundaryRegion"/>
/// that are <em>not</em> stored in this <see cref="DataRegionSet"/>.</returns>
/// <seealso cref="GetRegionsWithin(DataRegion)"/>
public IEnumerable <DataRegion> GetMissingRegions(DataRegion boundaryRegion)
{
lock (locker)
{
DataRegionSet negative = new DataRegionSet
{
boundaryRegion
};
foreach (var toRemove in this.GetRegionsWithin(boundaryRegion))
{
negative.Remove(toRemove);
}
return(negative);
}
}
