I’ve got the following code:

interface IActionHandler<in T> where T : IAction
{
    Status Execute(T action);
}

class SoftwareActionHandler : IActionHandler<SoftwareAction>
{
    public Status Execute(SoftwareAction action)
    {
        //implementation
    }
}

There are of course a few more implementations of IActionHandler<>.

Now when it comes to registering them in MS DI how would I go about doing that? Because of contravariance I can’t just do:

services.AddSingleton<IActionHandler<IAction>>, SoftwareActionHandler>();