Why not IRequestHandler<TRequest>?

For requests that do not need to return a value, the docs say to use the RequestHandler base class.

Why not just overload the IRequestHandler interface like so?

public interface IRequestHandler<in TRequest, out TResponse>
    where TRequest : IRequest<TResponse>
{
    TResponse Handle(TRequest message);
}

public interface IRequestHandler<in TRequest>
    where TRequest : IRequest
{
    void Handle(TRequest message);
}

It would be more consistent, and avoid unnecessary inheritance.

[jbogard]

One other thing - having two interfaces makes it quite a bit harder to build your own decorators. Having a single interface is better.

[khellang]

Cause it’s much easier to deal with a single interface with two generic arguments than two different ones with different generic arguments 😄