Question

I have an object User.

User 1..N Tags(string).

For instance, i have a List of Tag object. How can i query the User to find all the user that have at least 1 Tag in side the list of tags?

Thanks in advance 🙂

Answer 1

Assuming your code snippet means you have a property Tags of type Foo<string> where Foo is some sequence type, you could just use:

var taggedUsers = users.Where(user => tags.Any(tag => user.Tags.Contains(tag));

(Actually, that’s assuming you have a list of strings as Tags – the question is somewhat unclear. However, hopefully it’ll be enough to sort you out.)

EDIT: Okay, with the details in the comments, I think you probably just need:

var taggedUsers = users.Where(user => tags.Any(tag => user.Tags
                                                          .Select(t => t.Value)
                                                          .Contains(tag));