public EntityHandler(
IActiveHandler <TEntity> activateHandler,
IAddHandler <TEntity> addHandler,
IRemoveHandler <TKey> removeHandler)
{
ActivateHandler = activateHandler ?? throw new ArgumentNullException(nameof(activateHandler));
AddHandler = addHandler ?? throw new ArgumentNullException(nameof(addHandler));
RemoveHandler = removeHandler ?? throw new ArgumentNullException(nameof(removeHandler));
}
// This method must require T to be IModel because IAddHandler<T> requires
// T to be IModel.
public static void ValidateHandler <T>(IAddHandler <T> handler) where T : IModel
{
handler.GetData();
var result = handler.Add();
// IModel inherits from IResult. Hence, anything that implements IModel
// must implement IResult. So this is an implicit cast, even though IResult
// is implemented explicitly.
WriteResults(result);
}
