在统一和泛型的情况下，在容器旋转过程中是否注入关闭类型的实例，如果是的话，为什么？

Question

看来是这样的。如果我将泛型标记为封闭类型，则说明我打算使用type而不是Type的实例。我收到一个错误，因为Unity正试图解析下面ExternalLinkingRepository类中的关闭类型。错误声明，由于有多于1的参数(2)，联合不能协调构造函数。我已经看过构造函数注入器(确实需要一个用于连接字符串，但这不是问题)，有什么想法，为什么团结尝试实例化关闭类型？

这是我的容器和代码注册的片段。我错过了什么或者误解了什么：

    // Bootstrapping location...
    .RegisterType<ICampaignRepository, ExternalLinkingRepository>()

    // Concrete Repository -- CampaignDataContext is the cause of issue
    public class ExternalLinkingRepository : RepositoryBase<CampaignDataContext>, ICampaignRepository
    { 
      // blah
    }

    //Base class
     public abstract class RepositoryBase<T> where T : DataContext, IDisposable
     {

       protected T _dataContext;

       public RepositoryBase(String connectionString)
       {

        if (_dataContext == null)
        {
            _dataContext = (T)new DataContext(connectionString);
        }

       }

      public void Dispose()
      {
         if (_dataContext != null)
         {
            GC.SuppressFinalize(_dataContext);
            _dataContext.Connection.Close();
         }
      }

}

为anyaysis *容器Config*编辑更详细的代码列表和错误消息

      IUnityContainer container = new UnityContainer();

        // *****NB**** The code below throws an exception - this is a know bug with Unity
        // If you have the exception manager set to break on "thrown" exceptions (as opposed to just userhandled exceptions) you will be stopped here. 
        // However, the exception IS handled  within the Unity framework and execution of the application can continue safely. The next release of Unity will fix this. 
        // Remove this message when vNext Unity is used. 

        container.RegisterType<IBusinessManager, KnowledgeKubeBusinessManager>()
        .RegisterType<IDataManager, KnowledgeKubeDataManager>()
            // In this instance, specific concrete types are registered for the interfaces specified in the constructor of the UserManagerFactory
        .RegisterType<IUserManagerFactory, UserManagerFactory>(new InjectionConstructor(new ResolvedParameter(typeof(FormsAuthenticatedUserManager)), new ResolvedParameter(typeof(WindowsAuthenticatedUserManager))))
        .RegisterType<IApplicationConfigurationSettings, ApplicastionConfigurationSettings>()
        .RegisterType<IKnowledgeKubeSessionProvider, KnowledgeKubeManagerSessionProvider>()
        .RegisterType<IQuestionnaireQueryArgs, AnsweredKnowledgeQuestionnaireQueryArgs>()
        .RegisterType<ICampaignBusinessManager, CampaignBusinessManager>()
        .RegisterType<ICampaignRepository, ExternalLinkingRepository>(new InjectionConstructor(ConnectionString))


            // Add Interception on KnowledgeKubeDataManager using the  VirtualMethodInterceptor (Much Faster than the TransparentProxyInterceptor)  
        .AddNewExtension<Interception>().Configure<Interception>().SetDefaultInterceptorFor<KnowledgeKubeDataManager>(new VirtualMethodInterceptor())
        .Container.AddNewExtension<Interception>().Configure<Interception>().SetDefaultInterceptorFor<WindowsAuthenticatedUserManager>(new VirtualMethodInterceptor());

ExternalLinkingRepository config

/// <summary>
/// TODO: Some refactoring going on here from Campaign to external data linking. 
/// </summary>
public class ExternalLinkingRepository : RepositoryBase<CampaignDataContext>, ICampaignRepository
{

    public ExternalLinkingRepository(String connectionString) : base(connectionString) { }


      public void GetKnowledgeAreaIDs(String externalURLID, String username, out Guid userID, out Int32 knowledgeGroupID, out Int32 knowledgeQuestionnaireID)
    {
        knowledgeGroupID = 0;
        knowledgeQuestionnaireID = 0;
        userID = Guid.Empty; 

        try
        {
            int productIdx = 0; 
            foreach (var result in _dataContext.usp_GetKnowledgeAreaIDSByExternalURLID(externalURLID,username))
            {
            // blah

错误消息

“/WhiteBox”应用程序中的

服务器错误。类型CampaignDataContext具有长度为2的多个构造函数。无法消除歧义。描述:在执行当前web请求时发生了未处理的异常。请查看堆栈跟踪以获得有关错误的更多信息，以及它起源于代码的位置。

异常详细信息: System.InvalidOperationException: CampaignDataContext类型有长度为2的多个构造函数。无法消除歧义。

源错误：

第115行：_container =容器；第116行：

第117行:container.BuildUp(作为T)；第118行：

第119行：}

源文件: C:\Development\Acropolis\Development\KnowledgeKube_1.0.0\Acropolis Suite\WhiteBox\WhiteBox\Web\WhiteBoxBasePage.cs行: 117

堆栈跟踪：

InvalidOperationException: CampaignDataContext类型有多个长度大于2的构造函数，无法消除歧义。( Microsoft.Practices.ObjectBuilder2.ConstructorSelectorPolicyBase`1.FindLongestConstructor(>Type typeToConstruct) in e:\Builds\Unity\UnityTemp\Compile\Unity\Unity\Src\ObjectBuilder>\Strategies\BuildPlan\Creation\ConstructorSelectorPolicyBase.cs:113

Answer 1

在安装阶段，统一不会创建对象的实例。但是，当您注册一个映射时，联合尝试标识在创建实例时要使用的构造函数。默认情况下，联合将选择参数最多的构造函数(最贪婪的构造函数)。如果有多个构造函数接受参数的最大数量(我不确定，但从您的描述来看，似乎有两个ctors接受一个参数？)统一不能决定使用哪个构造函数，从而引发异常。要解决这个问题，可以删除其中一个构造函数，也可以明确地告诉团结使用哪个构造函数

container.RegisterType<ICampaignRepository, ExternalLinkingRepository>(
    new InjectionConstructor("myConnectionString"));

或者，如果您的ctor接受了您希望由Unity解析的参数，则可以根据它们的类型指定它们

container.RegisterType<ICampaignRepository, ExternalLinkingRepository>(
    new InjectionConstructor(typeof(IMyTypeThatUnityShouldResolve));