Question

To keep things simple, I have this class:

public class Contact
{
    public string Name { get; set; }
    public string[] Emails { get; set; }
}

I have a collection of contacts = IEnumerable<Contact>

I need to find all contacts in that collection that have, let’s say a text “xxx” in their email addresses (they may have multiple emails).

Something like that doesn’t work of course:

var found = contacts.Where(c => c.Emails.Where(e => e.Contains("xxx")));

I am wondering how to build such query using lambda expression?

Thanks.

Answer 1

Use Any instead of Where in the inner expression:

var found = contacts.Where(c => c.Emails.Any(e => e.Contains("xxx")));