Return list of specific property of object using linq

Question

Given a class like this:

public class Stock
{
    public Stock() {}
    public Guid StockID { get; set; }
    public string Description { get; set; }
}

Lets say I now have a List<Stock>. If I would like to retrieve a list of all the StockIDs and populate it into a IEnumerable or IList. Obviously I can do this.

List<Stock> stockItems = new List<Stock>();
List<Guid> ids = new List<Guid>();

foreach (Stock itm in stockItems) 
{
    ids.Add(itm.StockID);
}

But is there some way I could use Linq to achieve the same result? I thought Distinct() might do it but couldn't work out how to achieve the desired result.

Amiram Korach · Accepted Answer · 2012-07-20 07:02:04Z

164

var list = stockItems.Select(item => item.StockID).ToList();

answered Jul 20, 2012 at 7:02

Amiram Korach

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3 Comments

Maxim Gershkovich Over a year ago

Lol, well now I feel like an idiot. I should have worked that out. Thank you!

Pedro77 Over a year ago

How can I do the inverse process?

Amiram Korach Over a year ago

@Pedro77 using .Reverse()?

Ivan Golović · Accepted Answer · 2012-08-14 20:37:09Z

3

You could also do it like this:

ids = stockItems.ConvertAll<Guid>(o => o.StockID);

edited Aug 14, 2012 at 20:37

answered Jul 20, 2012 at 7:24

Ivan Golović

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Comments

BartekR · Accepted Answer · 2017-06-02 09:09:40Z

1

How about something like this? Can this be simplified?

List<TranCode> alltrans = new List<TranCode>();

foreach (var bh in obj1.obj2WithCollection.obj2Collection)
{
    alltrans.AddRange(bh.obj3WithCollection.Select(e => e.TransactionCode).ToList());
}

edited Jun 2, 2017 at 9:09

BartekR

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answered Jun 1, 2017 at 22:28

user2259416

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1 Comment

Dennis Rosenbaum Over a year ago

Try use the SelectMany() function like this obj1.obj2WithCollection.obj2Collection.SelectMany(bh => bh.obj3WithCollection.Select(e => e.TransactionCode)); See stackoverflow.com/questions/1191054/…

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