问题
The program I am working on exposes both callbacks and services using wcf. Basically, what the services do is simply return some variables value. As for the callback, they simply update those variables.
I want to be able to expose one class containing only the services and one class containing the services and the callbacks.
For example :
[ServiceContract]
[ServiceBehavior(InstanceContextMode=InstanceContextMode::Single, ConcurrencyMode=ConcurrencyMode::Multiple)]
public ServiceClass
{
[OperationContract]
public int getValue()
{
return mValue;
}
protected static int mValue;
};
[ServiceContract]
[ServiceBehavior(InstanceContextMode=InstanceContextMode::Single, ConcurrencyMode=ConcurrencyMode::Multiple)]
public ServiceAndCallbackClass : ServiceClass
{
[OperationContract]
public bool subscribe()
{
// some subscribing stuff
}
public void MyCallback()
{
++mValue;
// Notify every subscriber with the new value
}
};
If I want only the services, I can use the base class. However, if I want to subscribe to the callback and use the service, I can use ServiceAndCallbackClass.
Is this possible ?
回答1:
One solution I found :
Make 2 interfaces. The first one containing only the services and the second one inheriting from the first one and adding the callbacks.
An implementation class would implement the 2 interfaces.
Example :
[ServiceContract]
[ServiceKnownType(typeof(ICallback))]
public interface IService
{
[OperationContract]
int GetData();
}
[ServiceContract]
public interface ICallback : IService
{
[OperationContract]
public bool subscribe();
}
[ServiceBehavior(InstanceContextMode=InstanceContextMode::Single, ConcurrencyMode=ConcurrencyMode::Multiple)]
public ServiceClass : IService, ICallback
{
public int getValue()
{
return mValue;
}
public bool subscribe()
{
// some subscribing stuff
}
public void myCallback()
{
++mValue;
// Notify every subscriber with the new value
}
protected static int;
};
[ServiceBehavior(InstanceContextMode=InstanceContextMode::Single, ConcurrencyMode=ConcurrencyMode::Multiple)]
public ServiceAndCallbackClass : ServiceClass
{
// Dummy implementation used to create second service
};
From there, we can create 2 services. One based on the implementation class and one based on the "Dummy" class. Each service would be created from a different interface and thus exposing different methods.
来源:https://stackoverflow.com/questions/10249137/wcf-service-inheritance-extend-a-service