Logical vs Physical Addresses in WCF

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In this example, I share a listenUri between two endpoints.

Synopsis:

We have one service implementation that has two service contracts.
Each service contract will have it’s own endpoint.
Each endpoint will share a listenUri.

We’ve also setup an endpoint for our metadata exchange.
I’ve done all of this imperatively.

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Service code

using System.ServiceModel;
using System.ServiceModel.Description;

namespace Service
{
	[ServiceContract]
	public interface IGetHeaders
	{
		[OperationContract]
		string GetHeaders();
	}

	[ServiceContract]
	public interface ICalculate
	{
		[OperationContract]
		double Sum(double[] values);
	}

	public class HeaderService : IGetHeaders, ICalculate
	{
		public string GetHeaders()
		{
			return OperationContext.Current.RequestContext.RequestMessage.Headers.Action;
		}

		public double Sum(double[] values)
		{
			double result = 0.0;
			foreach (double value in values)
				result += value;
			return result;
		}
	}

	public class Program
	{
		public static void Main()
		{
			Uri baseAddress = new Uri("net.tcp://localhost:8241/Service");
			Uri listenUri = new Uri("net.tcp://localhost:8241/MyListenUri");

			ServiceHost serviceHost	= new ServiceHost(typeof(HeaderService), new Uri[] {baseAddress});
			NetTcpBinding netTcpBinding = new NetTcpBinding();

			serviceHost.AddServiceEndpoint(typeof(IGetHeaders),
				netTcpBinding, "/GetHeaders", listenUri);
			serviceHost.AddServiceEndpoint(typeof(ICalculate),
				netTcpBinding, "/Calculate", listenUri);

			ExposeMetadata(serviceHost);

				serviceHost.Open();
				Console.WriteLine("Host	running...");
			Console.WriteLine("Service {0} hosted and {1} to receive requests", serviceHost.Description.Name, serviceHost.State);
			Console.WriteLine("press Enter to terminate");
				Console.ReadLine();
				serviceHost.Close();
		}

		private static	void ExposeMetadata(ServiceHost serviceHost)
		{
			//Check	to see if the service host already has a ServiceMetadataBehavior
			ServiceMetadataBehavior	serviceMetadataBehavior	= serviceHost.Description.Behaviors.Find<ServiceMetadataBehavior>();
			//If not, add one
			if(serviceMetadataBehavior == null)
				serviceMetadataBehavior	= new ServiceMetadataBehavior();
			serviceMetadataBehavior.HttpGetEnabled = true;
			Uri mexUri = new Uri("http://localhost:8242/Service/Mex");
			serviceMetadataBehavior.HttpGetUrl = mexUri;
			serviceMetadataBehavior.MetadataExporter.PolicyVersion = PolicyVersion.Policy15;
			serviceHost.Description.Behaviors.Add(serviceMetadataBehavior);
			//Add MEX endpoint
			serviceHost.AddServiceEndpoint(ServiceMetadataBehavior.MexContractName,	MetadataExchangeBindings.CreateMexHttpBinding(), mexUri);
		}
	}
}

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Client code

using System;
using System.ServiceModel;
using System.ServiceModel.Description;

namespace Client
{
	 class Program
	 {
		  static void Main(string[] args)
		  {
			NetTcpBinding netTcpBinding = new NetTcpBinding();
			Uri myListenUri = new Uri("net.tcp://localhost:8241/MyListenUri");

			ServiceProxy.GetHeadersClient getHeadersProxy =
				new ServiceProxy.GetHeadersClient(netTcpBinding, new EndpointAddress("net.tcp://localhost:8241/Service/GetHeaders"));
			getHeadersProxy.Endpoint.Behaviors.Add(new ClientViaBehavior(myListenUri));

			ServiceProxy.CalculateClient calculateProxy =
				new ServiceProxy.CalculateClient(netTcpBinding, new EndpointAddress("net.tcp://localhost:8241/Service/Calculate"));
			calculateProxy.Endpoint.Behaviors.Add(new ClientViaBehavior(myListenUri));

			Console.WriteLine("Press Enter to exercise GetHeaders");
			Console.ReadLine();
			Console.WriteLine("And the header is: {0}{1}", getHeadersProxy.GetHeaders(), Environment.NewLine);
			Console.WriteLine("Press Enter to exercise Sum");
			Console.ReadLine();
			Console.WriteLine("And the sum is: {0}{1}", calculateProxy.Sum(new double[] { 1.4, 3.5, 7.8 }), Environment.NewLine);
			Console.WriteLine("press Enter to terminate");
			Console.ReadLine();
		  }
	 }
}

Click on link below to download full source code.

public class Program
{
public    static void    Main()
{
Uri baseAddress =    new Uri(“net.tcp://localhost:8241/Service”);
Uri listenUri = new Uri(“net.tcp://localhost:8241/MyListenUri”);

ServiceHost    serviceHost    = new    ServiceHost(typeof(HeaderService), new    Uri[]    {baseAddress});
NetTcpBinding netTcpBinding =    new NetTcpBinding();

serviceHost.AddServiceEndpoint(typeof(IGetHeaders),
netTcpBinding,    “/GetHeaders”,    listenUri);
serviceHost.AddServiceEndpoint(typeof(ICalculate),
netTcpBinding,    “/Calculate”, listenUri);

ExposeMetadata(serviceHost);

serviceHost.Open();
Console.WriteLine(“Host    running…”);
Console.WriteLine(“Service    {0} hosted and    {1} to receive    requests”, serviceHost.Description.Name, serviceHost.State);
Console.WriteLine(“press Enter to terminate”);
Console.ReadLine();
serviceHost.Close();
}

private static    void ExposeMetadata(ServiceHost serviceHost)
{
//    Check    to    see if the service host    already has    a ServiceMetadataBehavior
ServiceMetadataBehavior    serviceMetadataBehavior    = serviceHost.Description.Behaviors.Find<ServiceMetadataBehavior>();
//    If    not, add    one
if    (serviceMetadataBehavior == null)
serviceMetadataBehavior    = new    ServiceMetadataBehavior();
serviceMetadataBehavior.HttpGetEnabled    = true;
Uri mexUri = new Uri(“http://localhost:8242/Service/Mex&#8221;);
serviceMetadataBehavior.HttpGetUrl = mexUri;
serviceMetadataBehavior.MetadataExporter.PolicyVersion =    PolicyVersion.Policy15;
serviceHost.Description.Behaviors.Add(serviceMetadataBehavior);
//    Add MEX endpoint
serviceHost.AddServiceEndpoint(ServiceMetadataBehavior.MexContractName,    MetadataExchangeBindings.CreateMexHttpBinding(), mexUri);
}
}

SingleServiceListenUriTwoEndpoints.zip – 20.98 KB

Once you’ve built the solution, navigate to
Service\bin\Debug\Service.exe and run it.
You should see output like the following.

Now run the Client project in the debugger.
You should see output like the following, once you’ve hit Enter twice.

This is also a good read on the differences between
Logical vs. Physical Addresses.

Tags: WCF, Windows Communication Foundation