Check if element has a specific attribute using HtmlAgilityPack in VB.Net

I'm using HtmlAgilityPack to parse HTML.

I want to check if an element has a specific attribute.

I want to check whether an <a> tag has the href attribute.

Dim doc As HtmlDocument = New HtmlDocument()

d开发者_开发技巧oc.Load(New StringReader(content))

Dim root As HtmlNode = doc.DocumentNode
Dim anchorTags As New List(Of String)

For Each link As HtmlNode In root.SelectNodes("//a")
    If link.HasAttributes("href") Then doSomething() 'this doesn't work because hasAttributes only checks whether an element has attributes or not
Next

Like this:

If link.Attributes("href") IsNot Nothing Then