Shared interface (contract)

[max-ieremenko]

Problem

[ServiceContract]
public interface IService
{
    // method: POST /IService/SomeOperation
    [OperationContract]
    Task SomeOperation();
}

[ServiceContract]
public interface IConcreteService1 : IService { /* skip other operations ... */ }

[ServiceContract]
public interface IConcreteService2 : IService { /* skip other operations ... */ }

class ConcreteService1 : IConcreteService1
{
    public Task SomeOperation() { /* do something in the context of ConcreteService1 */ }
}

class ConcreteService2 : IConcreteService2
{
    public Task SomeOperation() { /* do something else in the context of ConcreteService2 */ }
}

// register /IService/SomeOperation
endpoints.MapGrpcService<ConcreteService1>();

// /IService/SomeOperation is already registered by ConcreteService1
endpoints.MapGrpcService<ConcreteService2>();

Boths ConcreteService1 and ConcreteService2 try to register the same endpoint /IService/SomeOperation and it leads to a naming conflict. For details see ServiceModel.Grpc service and operation names.

Solution

Remove ServiceContract attribute from IService.

// remove [ServiceContract]
public interface IService
{
    [OperationContract]
    Task SomeOperation();
}

// register endpoint /IConcreteService1/SomeOperation
endpoints.MapGrpcService<ConcreteService1>();

// register endpoint /IConcreteService2/SomeOperation
endpoints.MapGrpcService<ConcreteService2>();

If an interface does not contain [ServiceContract], the service name for each defined operation comes from the root [ServiceContract] interface, in the provided example root interfaces are IConcreteService1 and IConcreteService2

[max-ieremenko]

released in version 1.4.3, see example and service and operation bindings