/// <summary>
/// Returns all LibraryFileItems in all configured groups
/// </summary>
/// <returns></returns>
public IEnumerable <IFileItem> GetAllItems()
{
var c1 = System?.GetAllItems() ?? Enumerable.Empty <IFileItem>();
var c2 = Personal?.GetAllItems() ?? Enumerable.Empty <IFileItem>();
var c3 = Shared?.GetAllItems() ?? Enumerable.Empty <IFileItem>();
return(c1.Concat(c2).Concat(c3));
}
