Connecting to WCF service from Azure Functions and trouble-shooting assembly bindings - azure

Question

Where can I see the Assembly that Azure functions is trying to load ? (Like fuslogvw on windows)
Update
Update the title as requested to better reflect the accepted answer
Update
Changed my code to 'manually' construct the SOAP request using WebClient and it works ... so me thinks somewhere the WCF service proxy is not playing well within the sandbox that is Azure Functions ... Nevertheless I would still like an answer as to how we can see the Assembly binding log views.
Original Post
I keep getting the same error :
2016-11-17T10:32:44.392 System.IO.FileNotFoundException: The filename,
directory name, or volume label syntax is incorrect. (Exception from
HRESULT: 0x8007007B)
Server stack trace:
at
System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32
errorCode, IntPtr errorInfo)
at Microsoft.Win32.Fusion.ReadCache(ArrayList alAssems, String
name, UInt32 nFlag)
at System.Reflection.RuntimeAssembly.EnumerateCache(AssemblyName
partialName)
at
System.Reflection.RuntimeAssembly.LoadWithPartialNameInternal(AssemblyName
an, Evidence securityEvidence, StackCrawlMark& stackMark)
at System.Reflection.Assembly.LoadWithPartialName(String
partialName, Evidence securityEvidence)
at System.Xml.Serialization.TempAssembly.LoadGeneratedAssembly(Type
type, String defaultNamespace, XmlSerializerImplementation& contract)
at System.Xml.Serialization.XmlSerializer.FromMappings(XmlMapping[]
mappings, Type type)
at
System.ServiceModel.Description.XmlSerializerOperationBehavior.Reflector.SerializerGenerationContext.GenerateSerializers()
at
System.ServiceModel.Description.XmlSerializerOperationBehavior.Reflector.SerializerGenerationContext.GetSerializer(Int32
handle)
at
System.ServiceModel.Description.XmlSerializerOperationBehavior.Reflector.MessageInfo.get_BodySerializer()
at
System.ServiceModel.Dispatcher.XmlSerializerOperationFormatter.SerializeBody(XmlDictionaryWriter
writer, MessageVersion version, String action, MessageDescription
messageDescription, Object returnValue, Object[] parameters, Boolean
isRequest)
at
System.ServiceModel.Dispatcher.OperationFormatter.SerializeBodyContents(XmlDictionaryWriter
writer, MessageVersion version, Object[] parameters, Object
returnValue, Boolean isRequest)
at
System.ServiceModel.Dispatcher.OperationFormatter.OperationFormatterMessage.OperationFormatterBodyWriter.OnWriteBodyContents(XmlDictionaryWriter
writer)
at
System.ServiceModel.Channels.BodyWriterMessage.OnWriteBodyContents(XmlDictionaryWriter
writer)
at
System.ServiceModel.Channels.Message.OnWriteMessage(XmlDictionaryWriter
writer)
at
System.ServiceModel.Channels.TextMessageEncoderFactory.TextMessageEncoder.WriteMessage(Message
message, Stream stream)
at
System.ServiceModel.Channels.HttpOutput.WriteStreamedMessage(TimeSpan
timeout)
at System.ServiceModel.Channels.HttpOutput.Send(TimeSpan timeout)
at
System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.SendRequest(Message
message, TimeSpan timeout)
at System.ServiceModel.Channels.RequestChannel.Request(Message
message, TimeSpan timeout)
at
System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message
message, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action,
Boolean oneway, ProxyOperationRuntime operation, Object[] ins,
Object[] outs, TimeSpan timeout)
at
System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage
methodCall, ProxyOperationRuntime operation)
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage
message)
Exception rethrown at [0]:
at
System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage
reqMsg, IMessage retMsg)
at
System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData&
msgData, Int32 type)

Answer 1

Currently, there is no support to view assembly binding logs. Enabling diagnostic logs will help debug most of the errors. Also take a look at logging tips and tricks.
Here is a sample for connecting to a WCF service hosted in Azure from your function:
Got to Function App Settings --> Go to Kudu --> Go to D:\home\site\wwwroot\YourFunction
Create folder bin
Upload System.ServiceModel.dll
Upload WCF service contract IService1.csx. You can do this from either Kudu or View Files on the portal
#r "System.ServiceModel.dll"
using System.ServiceModel;
[ServiceContract]
public interface IService1
{
[OperationContract]
string GetData(int value);
[OperationContract]
string WelComeMessage(String name);
}
Sample queue trigger that invokes WCF endpoint:
#r "System.ServiceModel.dll"
#load "IService1.csx"
using System;
using System.ServiceModel;
public static void Run(string myQueueItem, TraceWriter log)
{
log.Info($"C# Queue trigger function processed: {myQueueItem}");
BasicHttpBinding b = new BasicHttpBinding();
EndpointAddress ea = new EndpointAddress("http://YourServiceAddress/service1.svc?wsdl");
var myChannelFactory = new ChannelFactory<IService1>(b, ea);
IService1 client = myChannelFactory.CreateChannel();
var msg= client.WelComeMessage("HelloWorld");
((ICommunicationObject)client).Close();
log.Info($"Hello from WCF: {msg}");
}
Hope this helps!