ChannelServices.RegisterChannel(new IpcClientChannel(), false);
NightModeService service = (NightModeService)Activator.GetObject(typeof(NightModeService), "ipc://NightModeServerChannel/NightModeService");

namespace NightModeCore.Service
{
    public interface NightModeService
    {
        double Opacity
        {
            get;
            set;
        }

        void SaveSetting();

        void Exit();

    }
}