public void CopyFrom(DiagramLibrary diagramLibrary)
{
if (null == diagramLibrary)
{
throw new ArgumentNullException(nameof(diagramLibrary));
}
foreach (KeyValuePair <string, DiagramCollection> sourceKVP in diagramLibrary.GetAll())
{
if (!TryGet(sourceKVP.Key, out DiagramCollection collection))
{
collection = Add(sourceKVP.Key);
}
collection.Add(sourceKVP.Value);
}
}
