title: Excel VBA add Autofilter if it doesn't exist
body: <p>How do I check if a range already has autofilters, and apply them if not.</p>
  
  <p>At the moment I am simply using</p>
  
  <pre><code>Range("A1:N1").AutoFilter
  </code></pre>
  
  <p>However if that range already has Filters on it turns them off.</p>
  
  <p>I have searched for this and found lots of solutions to clearing and reseting autofilters, but none about actually checking if filters are actually applied.</p>