请教如何一个将php函数转为.net方法

[hnsongbiao]

function showdistrict($values, $elems=array(), $container='districtbox', $showlevel=null, $containertype = 'birth') {
	$html = '';
	if(!preg_match("/^[A-Za-z0-9_]+$/", $container)) {
		return $html;
	}
	$showlevel = !empty($showlevel) ? intval($showlevel) : count($values);
	$showlevel = $showlevel <= 4 ? $showlevel : 4;
	$upids = array(0);
	for($i=0;$i<$showlevel;$i++) {
		if(!empty($values[$i])) {
			$upids[] = intval($values[$i]);
		} else {
			for($j=$i; $j<$showlevel; $j++) {
				$values[$j] = '';
			}
			break;
		}
	}
	$options = array(1=>array(), 2=>array(), 3=>array(), 4=>array());
	if($upids && is_array($upids)) {
		foreach(C::t('common_district')->fetch_all_by_upid($upids, 'displayorder', 'ASC') as $value) {
			if($value['level'] == 1 && ($value['id'] != $values[0] && ($value['usetype'] == 0 || !(($containertype == 'birth' && in_array($value['usetype'], array(1, 3))) || ($containertype != 'birth' && in_array($value['usetype'], array(2, 3))))))) {
				continue;
			}
			$options[$value['level']][] = array($value['id'], $value['name']);
		}
	}
	$names = array('province', 'city', 'district', 'community');
	for($i=0; $i<4;$i++) {
		if(!empty($elems[$i])) {
			$elems[$i] = dhtmlspecialchars(preg_replace("/[^\[A-Za-z0-9_\]]/", '', $elems[$i]));
		} else {
			$elems[$i] = ($containertype == 'birth' ? 'birth' : 'reside').$names[$i];
		}
	}
	for($i=0;$i<$showlevel;$i++) {
		$level = $i+1;
		if(!empty($options[$level])) {
			$jscall = "showdistrict('$container', ['$elems[0]', '$elems[1]', '$elems[2]', '$elems[3]'], $showlevel, $level, '$containertype')";
			$html .= '<select name="'.$elems[$i].'" id="'.$elems[$i].'" class="ps" onchange="'.$jscall.'" tabindex="1">';
			$html .= '<option value="">'.lang('spacecp', 'district_level_'.$level).'</option>';
			foreach($options[$level] as $option) {
				$selected = $option[0] == $values[$i] ? ' selected="selected"' : '';
				$html .= '<option did="'.$option[0].'" value="'.$option[1].'"'.$selected.'>'.$option[1].'</option>';
			}
			$html .= '</select>';
			$html .= '  ';
		}
	}
	return $html;
}


class table_common_district extends discuz_table
{
	public function __construct() {

		$this->_table = 'common_district';
		$this->_pk    = 'id';

		parent::__construct();
	}

	public function fetch_all_by_upid($upid, $order = null, $sort = 'DESC') {
		$upid = is_array($upid) ? array_map('intval', (array)$upid) : dintval($upid);
		if($upid !== null) {
			$ordersql = $order !== null && !empty($order) ? ' ORDER BY '.DB::order($order, $sort) : '';
			return DB::fetch_all('SELECT * FROM %t WHERE '.DB::field('upid', $upid)." $ordersql", array($this->_table), $this->_pk);
		}
		return array();
	}

	public function fetch_all_by_name($name) {
		if(!empty($name)) {
			return DB::fetch_all('SELECT * FROM %t WHERE '.DB::field('name', $name), array($this->_table));
		}
		return array();
	}

}

	public function fetch_all() {
		return DB::fetch_all('SELECT * FROM %t', array($this->_table));
	}

[hnsongbiao]

将showdistrict转为.net的