c# – 构造函数参数不存在时的异常

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我试图通过使用Unity将基于接口的两个对象注入到类构造函数中.

单元测试时我当前收到以下错误

Result Message:
Test method TestProject.TFStests.Check_Interface_CheckOut_Method threw exception:
System.InvalidOperationException: The type Adp.Tools.VersionControl.TfsVersionControl.TfsVcPromotionManager does not have a constructor that takes the parameters (TfsVcQaCheckoutWorker).

以下代码是我的Unity类,用于注册和解析TfsVCPromotionManager对象:

public class UnityClass
{
    public static ITfsVcPromotionManager returnNewPromotionManager(
       VersionControlServer tfServer)
    {
        var container = new UnityContainer();

        ITfsVcQaCheckinWorker test1 = CreateUnityCheckInWorker();
        ITfsVcQaCheckoutWorker test2 = CreateUnityCheckOutWorker(tfServer);

        container.RegisterType<ITfsVcPromotionManager,TfsVcPromotionManager>(
            new InjectionConstructor(test2),new InjectionConstructor(test1));
        return container.Resolve<TfsVcPromotionManager>();
    }

    private static ITfsVcQaCheckinWorker CreateUnityCheckInWorker()
    {
        var container = new UnityContainer();

        container.RegisterType<ITfsVcQaCheckinWorker,ITfsVcQaCheckinWorker>();
        return container.Resolve<TfsVcQaCheckinWorker>();
    }

    private static ITfsVcQaCheckoutWorker CreateUnityCheckOutWorker(
        VersionControlServer passedServer)
    {
        var container = new UnityContainer();

        container.RegisterType<ITfsVcQaCheckoutWorker,TfsVcQaCheckoutWorker>(
            new InjectionConstructor(passedServer));
        return container.Resolve<TfsVcQaCheckoutWorker>();
    }
}

这是TfsVcPromotionManager类的构造函数.请注意,它明确地接受了基于ITfsVcQaCheckoutworker和ITfsVcCheckinWorker接口的实例.

private ITfsVcQaCheckoutWorker _checkOutWorker;

    private ITfsVcQaCheckinWorker _checkInWorker;

    public TfsVcPromotionManager(ITfsVcQaCheckoutWorker checkOutWorker,ITfsVcQaCheckinWorker checkInWorker)
    {
        if (checkOutWorker == null || checkInWorker == null)
        {
            throw new NullReferenceException();
        }

        _checkOutWorker = checkOutWorker;
        _checkInWorker = checkInWorker;
    }

任何人都可以告诉我我做错了什么.

解决方法

它说它找不到“带参数的构造函数(TfsVcQaCheckoutWorker)”,这确实是一个真实的陈述.没有构造函数只接受一个参数.我对Unity并不熟悉,但我打赌你的问题可以通过改变这个来解决
container.RegisterType<ITfsVcPromotionManager,TfsVcPromotionManager>(
    new InjectionConstructor(test2),new InjectionConstructor(test1))

对此:

container.RegisterType<ITfsVcPromotionManager,TfsVcPromotionManager>(
    new InjectionConstructor(test2,test1))

有关InjectionConstructor的constructor,请参阅MSDN参考.

原文链接:https://www.f2er.com/csharp/244666.html

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