Question

For a method I have the following parameter IEnumerable<string> tags and with to query a list of objects, let’s call them Post, that contains a property IEnumerable<string> Tags { get; set; }.

My question is:
How do I use linq to query for objects that contains all the tags from the tags parameter?

private List<Post> posts = new List<Post>();

public IEnumerable<Post> GetPostsWithTags(IEnumerable<string> tags)
{
  return ???;
}

Answer 1

public IEnumerable<Post> GetPostsWithTags(IEnumerable<string> tags)
{
  return posts.Where(post => tags.All(tag => post.Tags.Contains(tag)));
}