SAP Web Service from .NET via WCF

I'm trying to consume a SAP Web Service from .NET via WCF. I've generated the proxy and I have configured the app.config file.

Here is my test code:

WebServiceSAP.ZTEST_RFCClient myWCFService = new WebServiceSAP.ZTEST_RFCClient("MyEndPoint");

myWCFService.ClientCredentials.UserName.UserName = "<UserName>";
myWCFService.ClientCredentials.UserName.Password = "<Password>";

WebServiceSAP.ZTestRfc parameter = new WebServiceSAP.ZTestRfc();
parameter.TestInput = "This is a simple test";

WebServiceSAP.ZTestRfcResponse response = myWCFService.ZTestRfc(parameter);

Console.WriteLine(reponse.TestOutput);
Console.ReadLine();            

The ZTestRFC SAP method is a very simple function that accepts an input string, and outputs: "Result: <the input string>"

When I call ZTestRFC method, I got a null value in variable response. But SOAP messages seem to be fine.

SOAP Request

<MessageLogTraceRecord>
<HttpRequest xmlns="http://schemas.microsoft.com/2004/06/ServiceModel/Management/MessageTrace">
<Method>POST</Method>
<QueryString></QueryString>
<WebHeaders>
<VsDebuggerCausalityData>uIDPoxJmI5NcDatNiPM/wFAr52kAAAAAtqHAVnNWjEeMpMExOyr/vN7OXwCJZltNnikldpg5migACQAA</VsDebuggerCausalityData>
</WebHeaders>
</HttpRequest>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<Action s:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">urn:sap-com:document:sap:soap:functions:mc-style:ZTEST_RFC:ZTestRfcRequest</Action>
</s:Header>
<s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<ZTestRfc xmlns="urn:sap-com:document:sap:soap:functions:mc-style">
<TestInput xmlns="">This is a simple test</TestInput>
</ZTestRfc>
</s:Body>
</s:Envelope>
</MessageLogTraceRecord>

SOAP Response

<MessageLogTraceRecord>
<HttpResponse xmlns="http://schemas.microsoft.com/2004/06/ServiceModel/Management/MessageTrace">
<StatusCode>OK</StatusCode>
<StatusDescription>OK</StatusDescription>
<WebHeaders>
<Content-Length>359</Content-Length>
<Content-Type>text/xml; charset=utf-8</Content-Type>
<Set-Cookie>MYSAPSSO2=AjExMDABAAxQMDEwMDA1MSAgICACAAMwNDADAAhEMTEgICAgIAQADDIwMTAxMTEwMTIwOQUABAAAAAgGAAFYCQABU%2f8A9jCB8wYJKoZIhvcNAQcCoIHlMIHiAgEBMQswCQYFKw4DAhoFADALBgkqhkiG9w0BBwExgcIwgb8CAQEwEzAOMQwwCgYDVQQDEwNQMTECAQAwCQYFKw4DAhoFAKBdMBgGCSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTEwMTExMDEyMDk0OFowIwYJKoZIhvcNAQkEMRYEFJC%2fNFLVBnu1ZAodWTlPApEs8sApMAkGByqGSM44BAMEMDAuAhUBS844BOB%2f8NgEGuepMgLaKbVEGGUCFQFLs6HiI%21BWT1MejMqvABd3%2fJFVMw%3d%3d; path=/; domain=.<domain ... ></Set-Cookie>
<Server>SAP NetWeaver Application Server / ABAP 700</Server>
</WebHeaders>
</HttpResponse>
<SOAP-ENV:Envelope xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header xmlns:s="http://schemas.xmlsoap开发者_运维百科.org/soap/envelope/"></s:Header>
<SOAP-ENV:Body>
<rfc:ZTestRfcResult xmlns:rfc="urn:sap-com:document:sap:soap:functions:mc-style">
<TestOutput xmlns="">Result:</TestOutput>
</rfc:ZTestRfcResult>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
</MessageLogTraceRecord>

I don't know what could be happening. Any ideas?

Thanks in advance

Offhand, it looks like when you created the proxy (BTW, what technique did you use to do that?), SAP told .NET that the parameter and the response would be in some namespace, but that you're sending the parameter in the empty namespace (""). That may be why the SAP service is returning "Result:". You may be getting a null response because your proxy may be expecting the TestOutput element to be in a different namespace.

Look at the generated proxy classes and see what namespaces are expected.