public Grouper AddGroupOwnerSource(IGroupOwnerSource ownerSource)
{
foreach (GroupStores store in ownerSource.GetSupportedGroupStores())
{
if (_ownerSources.ContainsKey(store))
{
throw new ArgumentException($"An owner source for {store} is already added.", nameof(ownerSource));
}
_ownerSources.Add(store, ownerSource);
}
return(this);
}
