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c# - ViewModelBuilder 泛型类型转换问题

转载 作者：太空狗 更新时间：2023-10-29 23:08:31 25 4
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绞尽脑汁也无济于事，不知道有没有人能帮上忙？

遇到一个非常令人沮丧的转换问题，我肯定会很快得到答案，但由于我对泛型类型推断或其他东西的理解有限，这可能只是发生了。

提前致谢!

场景是向导站点的多个“步骤”ViewModel。我正在为每个创建生成器类，并使用工厂为返回给我的步骤获取特定的生成器，这是 IStepViewModel 的集合。

public interface IStepViewModelBuilderFactory
{
    IStepModelBuilder<T> Create<T>(T stepViewModel) where T : IStepViewModel;
    void Release<T>(IStepModelBuilder<T> stepViewModelBuilder) where T : IStepViewModel;
}

public interface IStepViewModel
{
}

public interface IStepModelBuilder<TStepViewModel> : IModelBuilder<TStepViewModel> where TStepViewModel : IStepViewModel
{
}

public class SpecificViewModelBuilder : IStepModelBuilder<SpecificStepViewModel>
{
}

public class SpecificStepViewModel: StepViewModel
{
}

public abstract class StepViewModel : IStepViewModel
{
}

失败的测试!

[Test]
public void TestResolution()
{
    var factory = this.container.Resolve<IStepViewModelBuilderFactory>();

    IStepViewModel viewModel = new SpecificStepViewModel();

    var builder = factory.Create(viewModel); // Here

    Assert.That(builder, Is.Not.Null);
}

问题!

Unable to cast object of type 'Company.Namespace.SpecificViewModelBuilder ' to type 'Company.Namespace.Builders.IStepModelBuilder`1[Company.Namespace.IStepViewModel]'.

Factory Impl 如下使用 CaSTLe.Windsor

public class StepViewModelSelector : DefaultTypedFactoryComponentSelector
{        
    protected override Type GetComponentType(System.Reflection.MethodInfo method, object[] arguments)
    {
        var arg = arguments[0].GetType();
        var specType = typeof(IModelBuilder<>).MakeGenericType(arg);
        return specType;
    }
}

这个的注册:

container.AddFacility<TypedFactoryFacility>();

     ....

    container
        .Register(
            Classes
                .FromAssemblyContaining<StepViewModelSelector>()
                .BasedOn<StepViewModelSelector>());

    container
        .Register(
            Component
                .For<IStepViewModelBuilderFactory>()
                .AsFactory(c => c.SelectedWith<StepViewModelSelector>()));

堆栈跟踪:

System.InvalidCastException was unhandled by user code
HResult=-2147467262 Message=Unable to cast object of type 'Company.Namespace.SpecificViewModelBuilder' to type 'Company.Namespace.IStepModelBuilder`1[Company.Namespace.IStepViewModel]'. Source=DynamicProxyGenAssembly2 StackTrace: at Castle.Proxies.IStepViewModelBuilderFactoryProxy.Create[T](T stepViewModel) at Tests.Infrastructure.ViewModelBuilderFactoryTests.TestResolution() in c:\Project\Infrastructure\ViewModelBuilderFactoryTests.cs:line 61
InnerException:

编辑:IModelBuilder<T>界面

public interface IModelBuilder<TViewModel>
{
    TViewModel Build();
    TViewModel Rebuild(TViewModel model);
}

25 4 0
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