Android与ASPX webservice通信

Question

我想从aspx Web服务发送和接收数据，但我一直得到null响应。任何人都可以帮助我解决这个问题。谢谢！

以下是使用的代码：

private static String METHOD_NAME = "CheckVersion";
    private static String NAMESPACE = "http://tempuri.org/";
    private static String URL = "http://grpsvil.si2001.it/APIClient/Contents/RestPartnerTest.aspx";
    private static String SOAP_ACTION = "http://tempuri.org/";

    public void uploadToServer() {
        Log.v("--", "fn called!");

        SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
        request.addProperty("ApiKey",
                "apikey");
        request.addProperty("OperativeSystem", 0);
        request.addProperty("AppVersion", 1);
        request.addProperty("WebServiceVersion", 1);

        SoapSerializationEnvelope soapEnvelope = new SoapSerializationEnvelope(
                SoapSerializationEnvelope.VER12);// or 12
        soapEnvelope.dotNet = true;
        soapEnvelope.setOutputSoapObject(request);
        Log.v("--", "2");
        AndroidHttpTransport aht = new AndroidHttpTransport(URL);
        SoapPrimitive resultString;
        try {
            aht.call(SOAP_ACTION, soapEnvelope);

            resultString = (SoapPrimitive) soapEnvelope.getResponse();
            Log.v("--", "Responce: " + resultString);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            resultString = (SoapPrimitive) soapEnvelope.bodyIn;
            Log.v("--", resultString + " 1");
            e.printStackTrace();
        } catch (XmlPullParserException e) {
            // TODO Auto-generated catch block
            resultString = (SoapPrimitive) soapEnvelope.bodyIn;
            Log.v("--", resultString + " 2");
            e.printStackTrace();
        }
    }