title: c# Array.FindAllIndexOf which FindAll IndexOf
body: <p>I know c# has <a href="http://msdn.microsoft.com/en-us/library/1kkxfxdd.aspx"><code>Array.FindAll</code></a> and <a href="http://msdn.microsoft.com/en-us/library/system.array.indexof.aspx"><code>Array.IndexOf</code></a>.</p>
  
  <p>Is there a <code>Array.FindAllIndexOf</code> which returns <code>int[]</code>?</p>