Run WCF ServiceHost with multiple contracts

Sam_7021 0
Viewed 50787

Running a ServiceHost with a single contract is working fine like this:

servicehost = new ServiceHost(typeof(MyService1));
servicehost.AddServiceEndpoint(typeof(IMyService1), new NetTcpBinding(), "net.tcp://127.0.0.1:800/MyApp/MyService1");
servicehost.Open();

Now I'd like to add a second (3rd, 4th, ...) contract. My first guess would be to just add more endpoints like this:

servicehost = new ServiceHost(typeof(MyService1));
servicehost.AddServiceEndpoint(typeof(IMyService1), new NetTcpBinding(), "net.tcp://127.0.0.1:800/MyApp/MyService1");
servicehost.AddServiceEndpoint(typeof(IMyService2), new NetTcpBinding(), "net.tcp://127.0.0.1:800/MyApp/MyService2");
servicehost.Open();

But of course this does not work, since in the creation of ServiceHost I can either pass MyService1 as parameter or MyService2 - so I can add a lot of endpoints to my service, but all have to use the same contract, since I only can provide one implementation?
I got the feeling I'm missing the point, here. Sure there must be some way to provide an implementation for every endpoint-contract I add, or not?

self-hosting wcf
8 Answers

You need to implement both services (interfaces) in the same class.

servicehost = new ServiceHost(typeof(WcfEntryPoint));
servicehost.Open(); 

public class WcfEntryPoint : IMyService1, IMyService2
{
    #region IMyService1
    #endregion

    #region IMyService2
    #endregion
}

FYI: I frequently use partial classes to make my host class code easier to read:

// WcfEntryPoint.IMyService1.cs
public partial class WcfEntryPoint : IMyService1
{
    // IMyService1 methods
}

// WcfEntryPoint.IMyService2.cs
public partial class WcfEntryPoint : IMyService2
{
    // IMyService2 methods
}
chilltemp_287360

This answer is a further response to the comment in the accepted answer from chilltemp.

Sam, You really should determine why you need 10-50 contracts and try to find another solution. I looked over Juval Lowy's WCF Coding Standards (found on http://www.idesign.net/) and found the following references:

3 Service Contracts ... 4. Avoid contracts with one member. 5. Strive to have three to five members per service contract. 6. Do not have more than twenty members per service contract. Twelve is probably the practical limit.

He doesn't mention a limit on contract implementations (that I can find) but I can't imagine him viewing 50 contracts on a service as anything resembling a best practice. One solution I have found that works well is to use member sharing for similar functions.

For instance, if you are using the WCF service to perform mathematics on 2 values you might have 4 members on the service side: Add(x,y), Subtract(x,y), Multiply(x,y), Divide(x,y). If you combine these into a more generic member and use an object to pass the needed data you can easily reduce your member count and increase scalability. Example: PeformCalculation(obj) where obj has x, y, and action (add, subtract, multiply, divide) properties.

Hope this helps.

Chris_Porter_134950

chili's answer will work if you are ok with the contracts being shared by the service. If you want them to be separated try this:

host1 = new ServiceHost(typeof(MyService1));
host2 = new ServiceHost(typeof(MyService2));

host1.Open();
host2.Open();

public class MyService1 : IMyService1
{
    #region IMyService1
    #endregion
}

public class MyService2 : IMyService2
{
    #region IMyService2
    #endregion
}

Edit: As Matt posted, this would require multiple endpoints for each service/contract

Chris_Porter_134950
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