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Hi guys,

I have a WCF Service and I would like to implement some base class logic such as authentication and other basic checks which applies to all my services. The default implementation creates an interface to implement. I can't obviously then add concrete base class functions to this.

So the question is.. is there any downside to not using an interface when implementing a WCF Service?

thanks
Posted
Comments
Sergey Alexandrovich Kryukov 30-Jun-14 18:44pm
   
Why without interface? Why do you think avoiding interface would limit your extensibility?
—SA

1 solution

Hi Ashman786,

In General it is a bad idea to implement Services without Interfaces, cause the Interface represents the Service contract. Anyway I don't see any reason why you can't do "both".

Look at this example code "structure".

You can work with inheritance - also with Interfaces.

So you have:

a Interface for common Service operations like this:

C#
[ServiceContract]
public interface ICommonServiceMethods
{
    [OperationContract]
    string WriteLog(string strMessage);
}


a specific Service Interface inherited from the common operations Interface like this:

C#
[ServiceContract]
public interface IService1 : ICommonServiceMethods
{
    [OperationContract]
    string GetData(int value);
}


You can implement your common Service operations in a base class (could be abstract)

C#
public class BaseService : ICommonServiceMethods
 {
     public string WriteLog(string strMessage)
     {
         return strMessage; //dummy
     }
 }


And then just derive your specific Service instance from the base class while implementing the specific Service.

C#
public class Service1 : BaseService, IService1
{
    public string GetData(int value) { return value.ToString(); /* dummy */}
}



So no need to think about omitting "Interfaces" - although technically you could...

I hope this helps?

Kind regards Johannes
   
Comments
Ashman786 30-Jun-14 13:10pm
   
Thanks Johannes
that is exactly what I want to do.

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