C# Lists, create list object from a list of objects

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.

Kirill Polishchuk · Accepted Answer · 2022-03-29 20:27:33Z

3

You need to use Linq Select method, e.g.:

var onlySites = lsite.Select(s => s.Id).ToList();

This will produce a list of site Ids.

edited Mar 29, 2022 at 20:27

answered Feb 27, 2019 at 22:33

Kirill Polishchuk

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4 Comments

Sarah Over a year ago

That worked like a charm, I am not very familiar with => operator, is there a good tutorial on this. It looks like a very handy feature.

Kirill Polishchuk Over a year ago

@Sarah, this is a lambda expression. Have a look: learn.microsoft.com/en-us/dotnet/csharp/programming-guide/…

Andrew Truckle Over a year ago

Thanks, what about exstending it to return a sorted string[]? At the moment I have:

var listGroupNames = _PublisherData.FieldServiceGroups.Select(s => s.Name).ToList();  aryStrGroupNames = listGroupNames.OrderBy(p => p).ToArray();

. Can it be don't all on one line?

Kirill Polishchuk Over a year ago

@AndrewTruckle, var aryStrGroupNames = _PublisherData.FieldServiceGroups.Select(s => s.Name).OrderBy(p => p).ToArray();

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