WCF

WCF and net.pipe exception

Pedro Rainho — Wed, 22 Apr 2009 13:59:24 GMT

Today I came across an odd problem related with WCF and net.pipe binding.

If I expose one pipe on address “net.pipe://aaa/service/endpoint” and another on address “net.pipe://bbb/service/endpoint” I got this exception

“Cannot listen on pipe name net.pipe://bbb/service/endpoint because another pipe endpoint is already listening on that name. “

I found this very strange.

The logical explanation I have is this:

- net.pipe:// represents the transport protocol.

- aaa or bbb represents the machine or domain. Since net pipes are local I think aaa and bbb are ignored.

- service/endpoint represents the absolute path where the service is exposed.

So the solution to solve this problem was this:

net.pipe://pipe/aaa/service/endpoint

net.pipe://pipe/bbb/service/endpoint

Now the absolute path /aaa/service/endpoint and /bbb/service/endpoint are different and no exception is generated

Remove tempuri from WCF service

Pedro Rainho — Mon, 12 Jan 2009 14:30:43 GMT

If any one ever want was remove all http://tempuri.org namespaces from wcf service I really recommend all to check this two posts in http://www.pluralsight.com/community/blogs/kirillg/archive/2006/06/18/28380.aspx and http://cglessner.blogspot.com/2008/07/kill-tempuri-in-wcf-services.html. Helped me solve my problems.

One other thing I found when I was removing the http://tempuri.org namespaces.

If I want this:

<wsdl:definitions name="MyWCFService" targetNamespace="http://MyCompany/mywcfservice/">

I need to do this:

[ServiceBehavior(Namespace="http://MyCompany/mywcfservice/")]

public class MyWCFService : IMyWCFServiceContract

Or do this:

public class MyWCFService : IMyWCFServiceContract

and inside MyServiceHost do:

this.Description.Namespace = “http://MyCompany/mywcfservice/”;

don’t try this because it will not remove tempuri:

ServiceBehaviorAttribute serviceBehaviorAtribute = this.Description.Behaviors.Find<ServiceBehaviorAttribute>();

serviceBehaviorAtribute.Namespace = “http://MyCompany/mywcfservice/”;

This was my first choice until I realize my mistake.

WCF and HTTP GET

Pedro Rainho — Wed, 16 Apr 2008 16:00:19 GMT

Lets imagine that you need to invoke a url "http://localhost/webapp/run.aspx" and the result of calling this url is XML. And lets imagine that you need to call that url and pass some parameters via HTTP GET. The question is how can I do that?

I can use

HttpWebRequest

Or I can use WCF.

The First thing I need to do is define the service contract. So lets create the service contract

[ServiceContract]
public interface IHTTPGetCall
{
    [OperationContract(Action = "*")]
    Message Send(Message request);
}

Note the operation contract need to receive a Message and return a Message

The second thing I need to worry is, how can I create a Message Object to enable me call using HTTP GET

I'm goind to use HttpRequestMessageProperty

In this type I have to define:

SuppressEntityBody = false

Method = "GET"

and QueryString = Some query string

So lets create the HttpRequestMessageProperty

Message BuildMessage()
{
    MessagemessageToSend = null;
    HttpRequestMessageProperty reqProps = new HttpRequestMessageProperty();
    reqProps.SuppressEntityBody = false;
    reqProps.Method = "GET";
    reqProps.QueryString = "SID=1234567890&x=1";

    try
   {
        messageToSend = Message.CreateMessage(MessageVersion.None, string.Empty);
    }
    catch(Exceptione)
    {
        Console.WriteLine("got exception when sending message: "+ e.ToString());
    }

    messageToSend.Properties[HttpRequestMessageProperty.Name] = reqProps;
    returnmessageToSend;
}

Note that in previous method I create a HttpRequestMessageProperty and after that I create my message

We are half done.

Next...

I need to create My channel factory, my binding, my enconder, my transport, my endpoint and make my call.

public static void Main()
{

ChannelFactory<IHTTPGetCall> channelFactory;

CustomBinding poxBinding = new CustomBinding();
poxBinding.SendTimeout = new TimeSpan(0, 0, 0, 0, 50000);
poxBinding.ReceiveTimeout = new TimeSpan(0, 0, 0, 0, 50000);

poxBinding.OpenTimeout = new TimeSpan(0, 0, 0, 0, 50000);
poxBinding.CloseTimeout = new TimeSpan(0, 0, 0, 0, 50000);

// Encoder
TextMessageEncodingBindingElement encoder =
    new TextMessageEncodingBindingElement();
encoder.MessageVersion = MessageVersion.None;

poxBinding.Elements.Add(encoder);

// Transport
HttpTransportBindingElement transport = new HttpTransportBindingElement();
poxBinding.Elements.Add(transport);

EndpointAddress endpointAddress = new EndpointAddress("http://localhost/webapp/run.aspx");

channelFactory = new ChannelFactory<IHTTPGetCall>(poxBinding, endpointAddress);

IHTTPGetCall mycall= channelFactory.CreateChannel();

Message SendMessage = BuildMessage();
Message messageMyCall = mycall.Send(SendMessage);

StringBuilder messageContent = new StringBuilder();
messageMyCall.WriteMessage(new XmlTextWriter(new StringWriter(messageContent)));
Console.WriteLine( messageContent.ToString());

Note that in the Endpoint address I'm defining the location and in the HttpRequestMessageProperty I'm defining the querystring