public void Save()
{
using (var dbService = _dbServiceManager.GetService())
{
//update only that lendings, which have changed
Dictionary <int, bool> ids = new Dictionary <int, bool>();
LentBooks.Where(b => b.IsReturnedChanged).ForEach(l => ids.Add(l.Id, l.IsReturned));
if (ids.Count == 0)
{
TryClose(false);
}
else
{
dbService.Lendings.ReturnBooks(ids, LentBooks[0].LendingId);
TryClose(true);
}
}
}
