Using multiple conditions in Select statement using Linq

Hi,

I have following codes.
I have myCollection variable that contains all the Web elements.  I am using two paths using XPath and or('|') operator because I need different things from the objects that these two different paths gives.
From the elements from the first path(//div[@role='region' and //@my-label] ), I want to get Text properties.
From the elements from the second path(//button[@role='button' and //@my-label]), I want to get the values of 'my-label' attributes. (the Text properties for this elements are "")
After that, I want to put all these too myList<string>.
Obviously I am getting errors on my Linq query(at Select statement).
What's should I do to accomplish this?


public IReadOnlyCollection<IWebElement> myCollection => _driver.FindElements(By.XPath("//div[@role='region' and //@my-label]  | //button[@role='button' and //@my-label]"));

var myList = new List<string>();
myList = myCollection
                    .Select(a => a.Text or a => a.GetAttribute("my-label").ToString()) 
                    .Reverse() // Newest item first
                    .Where(a=>!String.IsNullOrEmpty(a))
                    .Where(b=>!String.IsNullOrEmpty(b))                              
                    .ToList();

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IsabellAsked:
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louisfrCommented:
Check the TagName:
.Select(a => a.TagName == "div" ? a.Text : a.GetAttribute("my-label").ToString())

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IsabellAuthor Commented:
Thanks louisfr,

But I am getting an ['System.NullReferenceException: 'Object reference not set to an instance of an object.'  
OpenQA.Selenium.IWebElement.GetAttribute(...) returned null.] error on Select statement

Any idea?
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