c# - Unity 类型没有可访问的构造函数

Question

我最近开始使用 unity，它似乎工作得很好，除了一个地方......我做了一些搜索，但我没有找到任何可以应用于我的代码的东西。

注册类型的代码如下:

Container.RegisterType<IVsoCommunicator, VsoCommunicator>();
Container.RegisterType<IIpxConnection, IpxCommunicator>();
Container.RegisterType<IConsentService, ConsentService>(new InjectionFactory(p => new ConsentService(p.Resolve<IIpxConnection>(), p.Resolve<IVsoCommunicator>())));
Container.RegisterType<ITimer, ConsentStatusPoller>(new InjectionFactory(p => new ConsentStatusPoller(p.Resolve<IConsentService>())));

异常(exception)情况:

Resolution of the dependency failed, type = "UserManager.Services.ConsentStatusPoller", name = "(none)".
Exception occurred while: while resolving.

Exception is: InvalidOperationException - The type IConsentService does not have an accessible constructor.

-----------------------------------------------

At the time of the exception, the container was:

Resolving UserManager.Services.ConsentStatusPoller,(none)

Resolving parameter "consentService" of constructor UserManager.Services.ConsentStatusPoller(UserManager.Services.IConsentService consentService)

Resolving UserManager.Services.IConsentService,(none)

我在这里做错了什么？一开始我以为我有一些私有(private)的东西，但事实并非如此

将注册更改为:

Container.RegisterType<ISettingsConfiguration, SettingsConfiguration>();
Container.RegisterType<IUnitOfWork, UnitOfWork>();
Container.RegisterType<IVsoCommunicator, VsoCommunicator>();
Container.RegisterType<IIpxConnection, IpxCommunicator>();
Container.RegisterType<IConsentService, ConsentService>();
Container.RegisterType<ITimer, ConsentStatusPoller>();

同意服务:

public interface IConsentService
{
    void GetConsentReplies();
    void GetConsentSmsUpdates();
}
public class ConsentService : IConsentService
{
    private readonly IIpxConnection _ipx;
    private readonly IVsoCommunicator _vso;

    public ConsentService(IIpxConnection ipx, IVsoCommunicator vso)
    {
        _ipx = ipx;
        _vso = vso;
    }

    public async void GetConsentReplies()
    {
    }

    private void UpdateLocationConsentSmsData(List<IncomingMessage> messages)
    {

    }

    private void SendConsentMessages(IEnumerable<IncomingMessage> messages)
    {


    }

    private void SaveIpxConsents(IEnumerable<createConsentResponse1> responses)
    {
    }

    public async void GetConsentSmsUpdates()
    {

    }

    private static void SaveConsentSmsUpdates(GetMessageStatusResponse resp)
    {

    }

}

同意轮询器:

public interface ITimer
{
    void Start(int interval);
}
public class ConsentStatusPoller : ITimer
{
    private readonly IConsentService _consentService;
    readonly Timer _tmr;

    public ConsentStatusPoller(IConsentService consentService)
    {
        _consentService = consentService;
        _tmr = new Timer();
        _tmr.Elapsed += _tmr_Elapsed;
    }

    void _tmr_Elapsed(object sender, ElapsedEventArgs e)
    {
        _consentService.GetConsentReplies();
        _consentService.GetConsentSmsUpdates();
    }



    public void Start(int interval)
    {
        _tmr.Interval = interval;
        _tmr.Start();
    }
}

Answer 1

这个错误看起来像容器不知道 IConsentService 映射到 ConsentService。您所有的注册看起来都是正确的，所以我唯一的猜测是在调用 Resolve 之前确保您的所有注册都已完成。要么，要么你打个电话Container.RegisterType<IConsentService>()那将覆盖您对 Container.RegisterType<IConsentService,ConsentService>() 的调用