C＃列表，从对象列表创建列表对象

Question

I have a list object like this

List<Site> lsite = GetSitesById(Id);

and the Site object is

public Site(int nId, string name, int Count)
        {
            Id = nId;
            Name = name;
            SiteOverrideCount = Count;
        }

What I need is List<int> OnlySites= which will have a list of only Site Id's

How can I get only id's from the lsite object, dump them in a list object and assign that to List OnlySites

I am new at this, hope my question made sense.

Answer 1

You need to use Linq Select method, eg:

List<int> OnlySites = lsite.Select(s => s.Id).ToList();

This will produce a list of site Ids.