StructureMap InstanceInterceptor 未被调用

Question

我想拦截 SM 中实例的创建，我正在尝试以下操作，但它没有调用 InstanceInterceptor 实现，有人知道为什么吗？

ForRequestedType<IPublishResources>()
 .TheDefault
 .Is
 .OfConcreteType<PublisherService>()
 .InterceptWith(new PublisherServiceInterceptor());

测试代码使用ObjectFactory创建实例，如下所示：

// Given we have a configure object factory in StructureMap...
ObjectFactory.Configure(x => x.AddRegistry(new StructureMapServiceRegistry()));

// When we request a publisher service...
var publisher = ObjectFactory.GetInstance<IPublishResources>();

Cheers

AWC

Answer 1

我无法在 2.5.4 版本中重现您的问题。这是我的代码。

public interface IPublishResources {}
class PublishResources : IPublishResources {}
public class LoggingInterceptor : InstanceInterceptor
{
    //this interceptor is a silly example of one
    public object Process(object target, IContext context)
    {
        Console.WriteLine("Interceptor Called");
        return context.GetInstance<PublishResources>();
    }
}

public class MyRegistry : Registry
{
    public MyRegistry()
    {
        For<IPublishResources>()
            .Use<PublishResources>()
            .InterceptWith(new LoggingInterceptor());
    }
}

[TestFixture]
public class Structuremap_interception_configuraiton
{
    [Test]
    public void connecting_implementations()
    {
        var container = new Container(cfg =>
        {
            cfg.AddRegistry<MyRegistry>();
        });

        container.GetInstance<IPublishResources>();
    }
}

一个问题。你真的需要在这里使用拦截器吗？如果您只需要定义一个工厂，您可以这样做。

    public interface IPublishResourcesFactory
{
    IPublishResources Create();
}

public class MyRegistry : Registry
{
    public MyRegistry()
    {
        For<IPublishResources>().Use(c =>
        {
            return c.GetInstance<IPublishResourcesFactory>().Create();
        });

        //or

        For<IPublishResources>().Use(c =>
        {
            //other object building code.
            return new PublishResources();
        });
    }
}