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POSystem.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.ArgumentNullException
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  1. POSystem.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.ArgumentNullException
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    copied!<p>I've been getting the error:</p> <p>System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.ArgumentNullException</p> <p>When I try to call my webservice using the following code:</p> <pre><code>{ //Create an echoSync request - set the services. ServiceNameType sourceService = new ServiceNameType {Service = "echoSync", OnBehalfOf = "Source"}; ServiceNameType destService = new ServiceNameType {Service = "echoSync", OnBehalfOf = "Destination"}; //Create the request. SDD2RequestType request = new SDD2RequestType { AppId = "echoSync", SourceService = sourceService, DestService = destService, RequestId = "1", RequestBody = "Ping" }; //Create the originator. originator originator = new originator {id = "123456789"}; //Create the transport. SDD2Transport transport = new SDD2Transport {originatorValue = originator}; //Send the request. SDD2ResponseType response = null; response = transport.SDD2TransportOp(request); //Write out the response. System.Console.WriteLine(response.ResponseBody.ToString()); } </code></pre> <p>My webservice method is quite simple and it looks like this:</p> <pre><code> [System.Web.Services.Protocols.SoapHeaderAttribute("originatorValue", Direction = System.Web.Services.Protocols.SoapHeaderDirection.InOut)] [System.Web.Services.WebMethodAttribute()] [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://memberdirect.net/SDD2/Transport", RequestElementName = "SDD2Transport", RequestNamespace = "http://cucbc.com/sdd2/transport/", ResponseElementName = "SDD2TransportResponse", ResponseNamespace = "http://cucbc.com/sdd2/transport/", Use = System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle = System.Web.Services.Protocols.SoapParameterStyle.Default)] [return: System.Xml.Serialization.XmlElementAttribute("SDD2Response", Namespace = "http://cucbc.com/sdd2/")] public override SDD2ResponseType SDD2TransportOp(SDD2RequestType SDD2Request) { if (SDD2Request == null) throw new ArgumentNullException("SDD2Request"); var response = new SDD2ResponseType(); switch (SDD2Request.AppId) { case "echoSync": response.AppId = SDD2Request.AppId; response.ProcessingStatus = ProcessingStatusType.Complete; response.RequestId = SDD2Request.RequestId; response.ResponseBody = "Pong"; break; default: throw new System.NotImplementedException(); break; } return response; } </code></pre> <p>When I make the call I know the request is not NULL but when it arrives at the webservice it is always received as null. I generated the webservice from WSDL using the wsdl.exe utility and clearly I don't understand all the details of SOAP that I should. Has anyone else run into this issue?</p>
 

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