.net - 将 ServiceStack 请求转发给其他服务处理程序

Question

我需要让一个服务处理请求，将其转换为其他请求，将该请求传递给内部服务，获取响应，然后将其转换回外部服务响应。一些代码可能会更好地解释它。这就是我所做的:

public class InviteUserService : Service, IPost<Invitee>
{
    public RegistrationService RegistrationService { get; set; }

    public object Post(Invitee invitee)
    {
        // Do other invitation related work that is part of my domain.

        var registration = invitee.TranslateTo<Registration>();
        registration.UserName = invitee.EmailAddress;
        registration.Email = invitee.EmailAddress;

        // It previously threw a null ref exception until I added this.
        RegistrationService.RequestContext = RequestContext;

        var response = RegistrationService.Post(registration);
        if (response is RegistrationResponse)
        {
            var inviteeResponse = response.TranslateTo<InviteeResponse>();
            return inviteeResponse;
        }
        // Else it is probably an error and just return it directly to be handled by SS.
        return response;
    }
}

正如上面代码中的注释所示，在我传递 RequestContext 之前，它失败并出现 NullReferenceException。现在我已经做到了，它确实可以工作，但我想知道我是否正在就 ServiceStack 的工作原理展开一场上游战斗？它会给我带来更多问题吗？

如果这两个服务都在我的控制之下，我只需将注册代码移至单独的共享依赖项中即可。然而，RegistrationService 内置于 ServiceStack 中，除此之外似乎无法以任何其他方式调用。除非我错过了什么？

Answer 1

ServiceStack中将请求委托(delegate)给其他服务的方式就是调用base.ResolveService<T>这只是 resolves the Service from the IOC and injects the current RequestContext为你。这本质上与您正在做的事情类似，但由于这是执行此操作的官方 API，因此如果需要执行其他操作，它将得到维护。

使用此 API，您的服务将如下所示:

public class InviteUserService : Service, IPost<Invitee>
{
    public object Post(Invitee invitee)
    {
        // Do other invitation related work that is part of my domain.

        var registration = invitee.TranslateTo<Registration>();
        registration.UserName = invitee.EmailAddress;
        registration.Email = invitee.EmailAddress;

        // Resolve auto-wired RegistrationService from IOC
        using (var regService = base.ResolveService<RegistrationService>())
        {
            var response = regService.Post(registration);
            if (response is RegistrationResponse)
            {
                var inviteeResponse = response.TranslateTo<InviteeResponse>();
                return inviteeResponse;
            }
            return response;
        }    
    }
}