C# SOAP Webservice方法返回null

Question

I'm calling a method from a SOAP webservice on a C# project and even though I can see the response arriving with the expected data and format (using fiddler) at the program level the method returns null. Can it be that the function is not properly parsing the response, somehow?

The function is called in standard way (selectedPLCInfo ends up as null)

LanDB.DeviceBasicInfo selectedPLCInfo = client.getDeviceBasicInfo(plcHostname);

This is the request being sent by the application:

POST xxx/soap/soap.fcgi?v=6 HTTP/1.1
Content-Type: text/xml; charset=utf-8
SOAPAction: ""
Host: xxx
Content-Length: 1439
Expect: 100-continue
Accept-Encoding: gzip, deflate

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
    <Auth xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
        <token xmlns="http://schemas.datacontract.org/2004/07/TIA_Portal_VPG_Manager">token</token>
    </Auth>
</s:Header>
<s:Body s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <q1:getDeviceBasicInfo xmlns:q1="urn:NetworkService"><DeviceName xsi:type="xsd:string">CFP-RE12-VLHCPFM2</DeviceName></q1:getDeviceBasicInfo></s:Body>
</s:Envelope>

And this is the response:

HTTP/1.1 200 OK
Date: Fri, 10 Jul 2020 10:15:17 GMT
Server: Apache
SOAPServer: SOAP060::Lite/Perl/0.60
Content-Length: 2912
Content-Type: text/xml; charset=utf-8

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:types="urn:NetworkDataTypes" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">

<SOAP-ENV:Body>
<namesp3945:getDeviceBasicInfoResponse xmlns:namesp3945="urn:NetworkService">
<DeviceBasicInfo xsi:type="types:DeviceInfo">

(... a ton of expected data here)

</DeviceBasicInfo>
</namesp3945:getDeviceBasicInfoResponse>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

Any ideas why this might be happening?

Thanks!

Answer 1

The solution was to add the service as a Web Reference instead of Service Reference. Further information here:

http://webservices20.blogspot.com/2008/10/interoperability-gotcha-visual-studio.html