title: clearcanvas read dicomdir
body: <p>I'm reading attributes from each dicom file in directory and it takes a lot of time. My code : </p>
  
  <pre><code>       var patient_id = k_di_.DataSet.GetAttribute(DicomTags.PatientId);
  </code></pre>
  
  <p>How can i do the same, but reading only in dicomdir?</p>