c# - ASP.NET MVC 3 : IDepencyResolver is trying to get an implementation of IControllerFactory

Question

为什么 IDependecyResolver 试图获取 IControllerFactory 的实例，尽管我注册了 DefaultControllerFactory？

Global.asax:

ControllerBuilder.Current.SetControllerFactory(typeof(DefaultControllerFactory));
DependencyResolver.SetResolver(new StructureMapDependencyResolver());

解析器:

public class StructureMapDependencyResolver : IDependencyResolver
{
    public static Func<Type, object> GetServiceViaDepencencyCallback = t =>
    {
        throw new NotImplementedException(
            "StructureMapDependencyResolver is not configured!");
    };

    public static Func<Type, IEnumerable<object>> GetServicesViaDepencencyCallback = t =>
    {
        throw new NotImplementedException(
            "StructureMapDependencyResolver is not configured!");
    };

    public object GetService(Type serviceType)
    {
        return GetServiceViaDepencencyCallback(serviceType);
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        return GetServicesViaDepencencyCallback(serviceType);
    }
}

抛出的错误:

StructureMap Exception Code: 202 No Default Instance defined for PluginFamily System.Web.Mvc.IControllerFactory, System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35

Answer 1

在 MVC3 中，DependencyResolver(它是一个服务定位器)用于尝试定位适用的类型。如果找不到类型，它会使用遗留代码(即 ControllerBuilder.Current 实例)继续查找。这里重要的是它通过您的 StructureMap 容器 DependencyResolver 检查。 MVC3 要求 DependencyResolver 返回 null，因为当它找不到类型时，框架不会负责从您的容器中捕获任何异常。