dependency-injection - 统一 IoC : "Operation could destabilize the runtime"

Question

是否可以在 UnityContainer 中配置的另一种类型的构造函数中实例化在 UnityContainer 中配置的类型？使用我当前的解决方案，我得到了一个

ResolutionFailedException:
Resolution of the dependency failed, type = "Sample.IMyProcessor", name = "(none)".
Exception occurred while: while resolving.
Exception is: VerificationException - Operation could destabilize the runtime.

问题是我的第二个类 (FileLoader) 有一个应该在第一个构造函数中计算的参数:

MyProcessor 类的构造函数:

public class MyProcessor : IMyProcessor
{
    private readonly IFileLoader loader;
    private readonly IRepository repository;

    public MyProcessor(IRepository repository, string environment, Func<SysConfig, IFileLoader> loaderFactory)
    {
        this.repository = repository;
        SysConfig config = repository.GetConfig(environment);

        loader = loaderFactory(config);
    }

    public void DoWork()
    {
        loader.Process();
    }
}

这里是带有 UnityContainer 配置的 Main 函数:

public static void Run()
{
    var unityContainer = new UnityContainer()
    .RegisterType<IRepository, MyRepository>()
    .RegisterType<IFileLoader, FileLoader>()
    .RegisterType<IMyProcessor, MyProcessor>(new InjectionConstructor(typeof(IRepository), "DEV", typeof(Func<SysConfig, IFileLoader>)));

    //Tests
    var x = unityContainer.Resolve<IRepository>(); //--> OK
    var y = unityContainer.Resolve<IFileLoader>(); //--> OK

    var processor = unityContainer.Resolve<IMyProcessor>();
    //--> ResolutionFailedException: "Operation could destabilize the runtime."

    processor.DoWork();
}

还有 FileLoader 类:

public class FileLoader : IFileLoader
{
    private readonly SysConfig sysConfig;

    public FileLoader(SysConfig sysConfig, IRepository repository)
    {
        this.sysConfig = sysConfig;
    }

    public void Process()
    {
        //some sample implementation
        if (sysConfig.IsProduction)
            Console.WriteLine("Production Environement");
        else
            Console.WriteLine("Test Environment");
    }
}

我假设问题与传递给 MyProcessor 类的 Func 有关。还有另一种方法可以将 loaderFactory 传递给 MyProcessor 类吗？

谢谢!

Answer 1

问题是 Unity 自动工厂只支持 Func<T>而不是任何其他 Func 泛型。

你可以在Unity中注册你想要的Func，然后它就会解析:

Func<SysConfig, IFileLoader> func = config => container.Resolve<IFileLoader>();
container.RegisterType<Func<SysConfig, IFileLoader>>(new InjectionFactory(c => func));

var processor = container.Resolve<IMyProcessor>();

还有一些其他解决方案，例如:Unity's automatic abstract factory