ExternallyOwned() 在程序集扫描级别不起作用？

Question

我在大会中有以下课程

AutofacDotMemory

public interface IOutput:IDisposable
{
    void Write(string content);
}


public class ConsoleOutput : IOutput
{
    public void Write(string content)
    {
        Console.WriteLine(content);
    }

    public void Dispose()
    {
        // TODO release managed resources here
    }
}


public interface IDateWriter:IDisposable
{
    void WriteDate();
}



public class TodayWriter : IDateWriter
{
    private IOutput _output;
    public TodayWriter( IOutput output)
    {
        this._output = output;
    }

    public void WriteDate()
    {
        this._output.Write(DateTime.Today.ToShortDateString());
    }

    public void Dispose()
    {
        // TODO release managed resources here
    }
}

在我的另一个测试程序集中，我还引用了 Autofac，并尝试在程序集扫描级别使用ExternallyOwned，并使用以下测试代码：

    [Test]
    public void ExternallyOwnedTest()
    {
        var builder = new ContainerBuilder();


        builder.RegisterAssemblyTypes(typeof(IDateWriter).Assembly)
            .ExternallyOwned();

        builder.RegisterType<ConsoleOutput>().As<IOutput>();
        builder.RegisterType<TodayWriter>().As<IDateWriter>();


        var container = builder.Build();

        var registration = container.ComponentRegistry.TryGetRegistration(new TypedService(typeof(IDateWriter)), out var foundRegistration);

        TestContext.WriteLine(registration);

        var isExternallyOwned = registration && foundRegistration.Ownership == InstanceOwnership.ExternallyOwned;

        Assert.IsTrue(isExternallyOwned, $"{nameof(TodayWriter)} is not externally owned");
        container.Dispose();
    }

测试失败，因为

TodayWriter

不是外部拥有的。

但是如果我将注册代码更改为以下内容，以便根据注册类型完成：

 var builder = new ContainerBuilder();
    
    builder.RegisterType<ConsoleOutput>().As<IOutput>();
    builder.RegisterType<TodayWriter>().As<IDateWriter>().ExternallyOwned(); //now this works
    
    
    var container = builder.Build();
    
    var registration = container.ComponentRegistry.TryGetRegistration(new TypedService(typeof(IDateWriter)), out var foundRegistration);
    
   TestContext.WriteLine(registration);
    
   var isExternallyOwned = registration && foundRegistration.Ownership == InstanceOwnership.ExternallyOwned;
    
    Assert.IsTrue(isExternallyOwned, $"{nameof(TodayWriter)} is not externally owned");
    container.Dispose();

现在这个测试通过了，因为

TodayWriter

是外部拥有的。

如何确保给定程序集中的所有类型（或至少大多数类型，受到

Where

过滤条件）注册为外部拥有？我不想遍历所有注册类型并在其中添加一个ExternallyOwned 关键字。

Answer 1

在你的测试中...

        builder.RegisterAssemblyTypes(typeof(IDateWriter).Assembly)
            .ExternallyOwned();

        builder.RegisterType<ConsoleOutput>().As<IOutput>();
        builder.RegisterType<TodayWriter>().As<IDateWriter>();

您已注册

TodayWriter

两次。一旦通过装配扫描，一次手动。

在装配扫描中，它被注册为

ExternallyOwned

。但后来你覆盖了并将其注册为正常，这是不是

ExternallyOwned

。报名中，最后一名获胜。