I was able to solve it. In order to get a valid SOAP client using
Xamarin/Monotouch running on iOS, you must use the Silverlight soap proxy
generator: slsvcutil.exe. this is because iOS does not allow dynamic code
execution and the standard soap proxy generator: svcutil.exe creates a
client that depends on dynamic code execution. The Silverlight generator
produces a simpler client without dynamic code execution. However, it is
too simple in that it does NOT support soap headers.
My solution to this problem is to still use the Silverlight soap proxy
generator, but then implement 2 classes to manually add in the soap headers
before the soap requests go out during runtime. Here are the two classes I
implemented. You will see that the second class contains the
BeforeSendRequest method which I override to manually add in my soap
headers. Of course, your soap headers will be different than mine. Then to
use these two classes, you add an endpoint behavior to your client when you
construct it: client.Endpoint.Behaviors.Add (new
EditorialSoapHeaderBehavior (appName,sessionId));
private class EditorialSoapHeaderBehavior : IEndpointBehavior
{
private string _appName = null;
private string _sessionId = null;
public EditorialSoapHeaderBehavior(string
appName,string sessionId)
{
_appName = appName;
_sessionId = sessionId;
}
public void AddBindingParameters (ServiceEndpoint
endpoint,
BindingParameterCollection parameters)
{
}
public void ApplyDispatchBehavior (ServiceEndpoint
endpoint,
EndpointDispatcher dispatcher)
{
}
public void ApplyClientBehavior (ServiceEndpoint
endpoint, ClientRuntime
runtime)
{
runtime.MessageInspectors.Add (new
EditorialSoapHeaderInspector
(_appName,_sessionId));
}
public void Validate (ServiceEndpoint endpoint)
{
}
}
private class EditorialSoapHeaderInspector :
IClientMessageInspector
{
private string _appName = null;
private string _sessionId = null;
public EditorialSoapHeaderInspector(string
appName,string sessionId)
{
_appName = appName;
_sessionId = sessionId;
}
public void AfterReceiveReply (ref Message message,
object
correlationState)
{
}
public object BeforeSendRequest (ref Message message,
IClientChannel
channel)
{
MessageHeader mh = MessageHeader.CreateHeader
("ApplicationName",
"IHS.Core.Security.WCF", _appName);
message.Headers.Add (mh);
mh = MessageHeader.CreateHeader ("SessionId",
"IHS.Core.Security.WCF",
_sessionId);
message.Headers.Add (mh);
return(null);
}
}
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