title: Why does Html.ActionLink render "?Length=4"
body: <p>I'm VERY confused as to why this code</p>
  
  <pre><code>Html.ActionLink("About", "About", "Home", new { hidefocus = "hidefocus" })
  </code></pre>
  
  <p>results in this link:</p>
  
  <pre><code>&lt;a hidefocus="hidefocus" href="/Home/About?Length=4"&gt;About&lt;/a&gt;
  </code></pre>
  
  <p>The <code>hidefocus</code> part is what I was aiming to achieve, but where does the <code>?Length=4</code> come from?</p>