我在网上找了一圈，发现对SOAP返回XML字符串的解析方法都是用的xmldocument，
可是用习惯了linq to xml不想用xmldocument，请问用xdocument怎么解析下面这段？谢谢！

<?xml version="1.0" encoding="utf-8"?>

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">

  <soap:Body>

    <ns2:getMaterialListResponse xmlns:ns2="http://erp.service.abc.com/">

      <materialList>

        <code>1AI6NF4H120A11303</code>

        <length>10.0</length>

      </materialList>

      <materialList>

        <code>1AI6NF4H120B11303</code>

        <length>20.0</length>

      </materialList>

      <materialList>

        <code>1AI4NF4H020BHH803</code>

        <length>0.0</length>

      </materialList>

    </ns2:getMaterialListResponse>

  </soap:Body>

</soap:Envelope>