How to get value with foreach and pass it to method?

Question

.NET

There is this method:

public string GetPhotoUrl()
        {
            var posts = Api.Wall.Get(new WallGetParams { Domain = "some_domain", Count = 2 });
            foreach (var item in posts.WallPosts)
            {
                string phUrl = (item.Attachments[0].Instance as Photo).Sizes[0].Url.AbsoluteUri.ToString();
                MessageBox.Show(phUrl);
            }
            
            return "";
        }

How can I get a value with foreach and pass it to a method?

Answer 1

public IEnumerable<string> GetPhotoUrl() =>
            Api
                .Wall
                .Get(new WallGetParams
                {
                    Domain = "lol.community",
                    Count = 2
                })
                .WallPosts
                .Select(item => item.Attachments.FirstOfDefault()?.Instance)
                .OfType<Photo>()
                .Select(item => item.Sizes.FirstOfDefault()?.Url.AbsoluteUrl.ToString());