c# - 为同一接口(interface)的多个实现设置属性

Question

我正在尝试注册同一接口(interface)的多个实现...然后...使用 Setter 在我的 Application 实例上设置属性。我已经尝试了多个在线示例，并且总是将相同的实例插入到 2 个应用程序属性中。

• 注意:我试过很多网上的例子，下面是最新的版本

例如……
当我在 Quick Watch 中查看应用程序对象时，我得到以下信息

我的配置:
显然，我已经解析出所有其他对象...

public ContainerRegistry()
{
    Scan(
        scan =>
        {
            scan.TheCallingAssembly();
            scan.WithDefaultConventions();
            scan.LookForRegistries();
            scan.AssembliesFromApplicationBaseDirectory(f => f.FullName.StartsWith("Demo.Common", true, null));
            scan.AssembliesFromApplicationBaseDirectory(f => f.FullName.StartsWith("XXX.XXX.MeasurementContracts", true, null));
            scan.AddAllTypesOf(typeof(IMeasurementContractsApplication));
            scan.AddAllTypesOf(typeof(IInstanceProvider));
            scan.SingleImplementationsOfInterface();
        });

    // --------
    // NAMED INSTANCES - IInstanceProvider
    For<IInstanceProvider>().Use<DistributionListProvider>();
    For<IInstanceProvider>().Add<FirstDeliveryNoticeDocumentRecallManager>().Named("firstDeliveryNoticeDocumentRecallManager");

    // --------
    // APPLICATION
    For<IMeasurementContractsApplication>().Use<MeasurementContractsApplication>()

        // Component
        .Setter(x => x.DistributionListProvider).Is<DistributionListProvider>()
        .Setter(x => x.FirstDeliveryNoticeDocumentRecallManager).IsNamedInstance("firstDeliveryNoticeDocumentRecallManager");
}

应用示例:
显然，我已经解析出所有其他对象...

public class MeasurementContractsApplication : IMeasurementContractsApplication
{
    [SetterProperty]
    public IMeasurementContractsUnitOfWork UnitOfWork { get; set; }

    [SetterProperty]
    public IInstanceProvider DistributionListProvider { get; set; }

    [SetterProperty]
    public IInstanceProvider FirstDeliveryNoticeDocumentRecallProvider { get; set; }
}

IInstanceProvider 的:

public class DistributionListProvider : ProviderBase, IInstanceProvider
{
    // Purposely left-out Properties, Methods etc.
}

public class FirstDeliveryNoticeDocumentAdminUpdateProvider : ProviderBase, IInstanceProvider
{
    // Purposely left-out Properties, Methods etc.
}

public class ProviderBase
{
    [SetterProperty]
    public IMeasurementContractsUnitOfWork UnitOfWork { get; set; }

}

----------------------------------------
更新:来自向我提出的问题
为了将事情降低到极其基本的水平......我决定实现一组最小的 2 个类来尝试建议:

public interface ITesting
{
    string Name();
}

public class Foo : ITesting
{
    public string Name()
    {
        return string.Empty;
    }
}

public class Bar : ITesting
{
    public string Name()
    {
        return string.Empty;
    }
}

public ContainerRegistry()
{
    Scan(
        scan =>
        {
            scan.TheCallingAssembly();
            scan.WithDefaultConventions();
            scan.LookForRegistries();
            scan.AssembliesFromApplicationBaseDirectory(f => f.FullName.StartsWith("Demo.Common", true, null));
            scan.AssembliesFromApplicationBaseDirectory(f => f.FullName.StartsWith("XXX.MeasurementContracts", true, null));
            scan.AddAllTypesOf(typeof(IMeasurementContractsApplication));
            scan.AddAllTypesOf(typeof(IManager<>));
            scan.AddAllTypesOf(typeof(IDocumentDependency));
            scan.AddAllTypesOf(typeof(IDataItemProviderFor<>));
            scan.AddAllTypesOf(typeof(IDatasetBuilderFor<>));
            scan.AddAllTypesOf(typeof(IXmlTransformerFor<>));
            scan.AddAllTypesOf(typeof(IWorkflowProvider));
            scan.AddAllTypesOf(typeof(IInstanceProvider));
            scan.AddAllTypesOf(typeof(IPdfConverterClient));
            scan.AddAllTypesOf(typeof(IReportFor<>));
            scan.AddAllTypesOf(typeof(IAdminUpdateCommandFor<>));
            scan.AddAllTypesOf(typeof(ITesting));
            scan.SingleImplementationsOfInterface();
        });

         Component Providers
        For<IMeasurementContractsApplication>().Use<MeasurementContractsApplication>()
            Setter(x => x.Bar).Is<Bar>()
            Setter(x => x.Foo).Is<Foo>();
}

总是会发生两种结果之一

1. 属性为NULL
2. 我收到以下错误消息

"No default Instance is registered and cannot be automatically determined for type 'IInstanceProvider' No default instance is specified."

问:目标实现位于何处？

XXX.MeasurementContracts.Business
包含“ContainerRegistry”和所有类、接口(interface)等。

XXX.MeasurementContracts.Web
包含“StructuremapMvcConfig”、“IoC”初始化器和它自己的“DefaultRegistry”

MeasurementContracts.UnitTests
在其“IoC”初始值设定项中添加业务“ContainerRegistry”...然后添加其自己的“ContainerRegistry”。

尝试:尝试命名注册我将以下内容添加到“ContainerRegistry”，同时，两者都被填充了......它们的类型为“Bar”

// Component Providers
For<ITesting>().Use<Bar>().Named("Bar");
For<ITesting>().Add<Foo>().Named("Foo");

// Component Providers
For<IMeasurementContractsApplication>().Use<MeasurementContractsApplication>()
     .Setter(x => x.Bar).Is<Bar>()
     .Setter(x => x.Foo).Is<Foo>();

如何解决“Foo”？我也试过 ".Setter(x => x.Foo).Is(c => c.GetInstance("Foo"));"

分析:使用 container.WhatDoIHave()好的，使用“WhatDoIHave”显示我已正确配置“ITesting”实例。

• transient - XXX.MeasurementContracts.Business.Providers.Bar('bar') - bar(默认)
• transient - XXX.MeasurementContracts.Business.Providers.Foo('foo') - foo

如何将“Foo”和“Bar”分解为各自的属性？

Answer 1

删除 DistributionListProvider 和 FirstDeliveryNoticeDocumentRecallProvider 属性的显式 setter 属性。

Explicit Setter Injection with [SetterProperty] Attributes

Without the [SetterProperty] attributes decorating the setters, StructureMap would ignore the DistributionListProvider and FirstDeliveryNoticeDocumentRecallProvider properties when it builds up a MeasurementContractsApplication object. With the attributes, StructureMap will try to build and attach values for the two properties as part of object construction.

public class MeasurementContractsApplication : IMeasurementContractsApplication {
    [SetterProperty]
    public IMeasurementContractsUnitOfWork UnitOfWork { get; set; }

   
    public IInstanceProvider DistributionListProvider { get; set; }

   
    public IInstanceProvider FirstDeliveryNoticeDocumentRecallProvider { get; set; }
}

并且由于它无法区分哪个接口(interface)用于哪个属性，因此它将第一个注册的接口(interface)应用于两个属性。

这就是为什么在这种情况下，您应该直接应用内联 setter

Inline Setter Configuration

Any setter property not configured with [SetterProperty] or the setter policies in the next section can still be filled by StructureMap if an inline dependency is configured matching that setter property as shown in the example below:

For<IMeasurementContractsApplication>()
    .Use<MeasurementContractsApplication>()
    // Component
    .Setter(x => x.DistributionListProvider)
        .Is<DistributionListProvider>()
    .Setter(x => x.FirstDeliveryNoticeDocumentRecallManager)
        .Is<FirstDeliveryNoticeDocumentAdminUpdateProvider>();

以下最小完整且可验证的示例演示了上述内容并在测试时通过。

namespace StructureMap.Unit_Tests.Misc {
    [TestClass]
    public class StructureMapTests {
        [TestMethod]
        public void _Inline_Setter_Should_Populate_Multiple_Implementations() {
            //Arrange
            var registry = new StructureMap.Registry();
            registry.IncludeRegistry<ContainerRegistry>();
            // build a container
            var container = new StructureMap.Container(registry);

            //Act
            var application = container.GetInstance<IMeasurementContractsApplication>();

            //Assert
            application.Should().NotBeNull();
            application.Foo.Should().BeOfType<Foo>();
            application.Bar.Should().BeOfType<Bar>();
        }
    }

    class ContainerRegistry : StructureMap.Registry {
        public ContainerRegistry() {
            Scan(
                scan => {
                    scan.TheCallingAssembly();
                    scan.WithDefaultConventions();
                    scan.LookForRegistries();
                    scan.AssembliesFromApplicationBaseDirectory(f => f.FullName.StartsWith("Demo.Common", true, null));
                    scan.AssembliesFromApplicationBaseDirectory(f => f.FullName.StartsWith("XXX.MeasurementContracts", true, null));
                    scan.AddAllTypesOf(typeof(IMeasurementContractsApplication));                    
                    scan.AddAllTypesOf(typeof(ITesting));
                    scan.SingleImplementationsOfInterface();
                });

            //Component Providers
            For<IMeasurementContractsApplication>()
                .Use<MeasurementContractsApplication>()
                .Setter(x => x.Bar)
                    .Is<Bar>()
                .Setter(x => x.Foo)
                    .Is<Foo>();
        }
    }

    public interface IMeasurementContractsApplication {
        ITesting Foo { get; set; }
        ITesting Bar { get; set; }
    }

    public class MeasurementContractsApplication : IMeasurementContractsApplication {
        public ITesting Foo { get; set; }
        public ITesting Bar { get; set; }
    }

    public interface ITesting {
        string Name();
    }

    public class Foo : ITesting {
        public string Name() {
            return string.Empty;
        }
    }

    public class Bar : ITesting {
        public string Name() {
            return string.Empty;
        }
    }
}