问题解决依赖使用Unity [英] Issue resolving dependencies with Unity

问题描述

当我试图解决我的UnitOfWork我得到这个错误：

的类型IUnitOfWork不具有可访问的构造函数

但是当我的UnitOfWork的LifetimeManager设置PerResolveLifetimeManager这只是发生。如果我只是使用的是默认的，一切工作正常。
我的UnitOfWork，确实有一个公共无参数构造函数。
这是我的代码：

  //全球ASAX 
 IUnityContainer团结=新UnityContainer（）; 
 unity.RegisterType<&HomeController的GT;（）; 
 unity.RegisterInstance&所述; IUnitOfWork>（新的UnitOfWork（），新PerResolveLifetimeManager（））; 
 ControllerBuilder.Current.SetControllerFactory（新IocControllerFactory（单位））; 
 
 // IocControllerFactory 
公共类IocControllerFactory：DefaultControllerFactory 
 {
私人只读IUnityContainer _container; 
 
公共IocControllerFactory（IUnityContainer容器）
 {
 _container =容器; 
} 
 
保护覆盖一个IController GetControllerInstance（RequestContext的RequestContext的，类型controllerType）
 {
如果（controllerType！= NULL）
返回_container.Resolve（controllerType ）作为一个IController; 
，否则
返回base.GetControllerInstance（RequestContext的，controllerType）; 
} 
} 
 
 //首页的控制器构造
公众的HomeController（IUnitOfWork的UnitOfWork）
 {
} 
  

解决方案

您可以指定以下统一的一个内置终身经理
类型或当你调用 RegisterInstance 方法您的自定义类型：

1. ContainerControlledLifetimeManager


2. ExternallyControlledLifetimeManager


3. HierarchicalLifetimeManager

注意：这是不恰当的，以使用 PerResolveLifetimeManager 或 TransientLifetimeManager 与
RegisterInstance 因为它们都建立在每次调用
的新实例来解决。

这href=\"http://msdn.microsoft.com/en-us/library/ff660894%28v=pandp.20%29.aspx\" rel=\"nofollow\">官方文档的团结2.0，检查节上使用的方法RegisterInstance终生经理。

As soon as i'm trying to resolve my unitOfWork i get this error :

"The type IUnitOfWork does not have an accessible constructor."

However this only happens when i set the LifetimeManager of the unitOfWork to PerResolveLifetimeManager. If I'm just using the default one, everything works fine. My unitOfWork, do have a public parameterless constructor. This is my code :

//Global asax
IUnityContainer unity = new UnityContainer();
unity.RegisterType<HomeController>();
unity.RegisterInstance<IUnitOfWork>(new UnitOfWork(), new PerResolveLifetimeManager()); 
ControllerBuilder.Current.SetControllerFactory(new IocControllerFactory(unity));

//IocControllerFactory 
public class IocControllerFactory : DefaultControllerFactory
{
    private readonly IUnityContainer _container;

    public IocControllerFactory(IUnityContainer container)
    {
        _container = container;
    }

    protected override IController GetControllerInstance(RequestContext requestContext, Type controllerType)
    {
        if (controllerType != null)
            return _container.Resolve(controllerType) as IController;
        else
            return base.GetControllerInstance(requestContext, controllerType);
    }
}

//Home controller constructor
public HomeController(IUnitOfWork unitOfWork)
{
}

解决方案

You can specify one of the following Unity Built-In Lifetime Managers types or your custom type when you call the RegisterInstance method:

1. ContainerControlledLifetimeManager
2. ExternallyControlledLifetimeManager
3. HierarchicalLifetimeManager

Note: It is not appropriate to use either PerResolveLifetimeManager or TransientLifetimeManager with RegisterInstance since they both create a new instance on every call to resolve.

Taken from the official documentation on Unity 2.0, check the section on Using a Lifetime Manager with the RegisterInstance Method.

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