list all categories from custom post type? #cpt #wordpress

sidebar.php

<?php
   $args = array(
               'taxonomy' => 'event_category',
               'orderby' => 'name',
               'order'   => 'ASC'
           );

   $cats = get_categories($args);

   foreach($cats as $cat) {
?>
      <a href="<?php echo get_category_link( $cat->term_id ) ?>">
           <?php echo $cat->name; ?>
      </a>
<?php
   }
?>