我可以使用LINQ从现有列表创建新的对象列表

Question

I have a list of invoices that have both start and end dates. Can I use LINQ to get all the start and end dates from the invoice list and put them into a new list of type Period :

Period(DateTime startDate, DateTime endDate) {};

I can do this with a foreach as shown below but wanted to know if there was a better way to do this with LINQ.

foreach(Invoice invoice in invoices)
{
    periods.Add(new Period(invoice.StartDate, invoice.EndDate));
}

Answer 1

If you want to create a new periods list:

List<Period> periods = invoices.Select(i => new Period(i.StartDate, i.EndDate)).ToList();

If you want to attach the invoice items to a existing periods list:

periods.AddRange(invoices.Select(i => new Period(i.StartDate, i.EndDate)));