Specflow-从.NET Core使用Microsoft依赖注入会导致BoDi.ObjectContainerException

时间:2019-04-02 10:33:15

标签: c# dependency-injection .net-core specflow

我目前正在尝试使用Speflow设置新的.NET Core项目,并将默认的Microsoft Dependency Injection连接到它。

研究了文档和Autofac / Ninject实现之后,我尝试实现自己的运行时插件“ SpecFlow.MSDependencyInjection.SpecFlowPlugin”。

现在,我正在努力解决Specflow特定的基础架构,例如ScenarioContext。

    public static class DependencyInjectionExtension
    {
        private static void RegisterSpecflowDependecies(IObjectContainer objectContainer, ServiceCollection serviceCollection)
        {
            serviceCollection.AddSingleton(objectContainer);

            serviceCollection.AddSingleton((x) =>
            {
                var specflowContainer = x.GetRequiredService<IObjectContainer>();
                var scenarioContext = specflowContainer.Resolve<ScenarioContext>();
                return scenarioContext;
            });

            serviceCollection.AddSingleton((x) =>
            {
                var specflowContainer = x.GetRequiredService<IObjectContainer>();
                var scenarioContext = specflowContainer.Resolve<FeatureContext>();
                return scenarioContext;
            });

            serviceCollection.AddSingleton((x) =>
            {
                var specflowContainer = x.GetRequiredService<IObjectContainer>();
                var scenarioContext = specflowContainer.Resolve<TestThreadContext>();
                return scenarioContext;
            });
        }

        [ScenarioDependencies]
        public static IServiceProvider CreateServiceCollection(IObjectContainer objectContainer)
        {
            var serviceCollection = new ServiceCollection();

            RegisterSpecflowDependecies(objectContainer, serviceCollection);

            var bindingAttributeClasses = typeof(DependencyInjectionExtension).Assembly.GetTypes()
                .Where(t => Attribute.IsDefined(t, typeof(BindingAttribute))).ToArray();

            foreach (var bindingAttributeClass in bindingAttributeClasses)
            {
                serviceCollection.AddSingleton(bindingAttributeClass);
            }

            return serviceCollection.BuildServiceProvider();
        }
    }

当Specflow尝试解析我的绑定之一时,出现以下异常:

BoDi.ObjectContainerException: 'Primitive types or structs cannot be resolved: System.String (resolution path: TechTalk.SpecFlow.ScenarioContext->TechTalk.SpecFlow.ScenarioInfo)'

RegisterSpecflowDependecies的代码与Autofac实现非常相似。所以我不明白为什么它在我的实现中不起作用。

1 个答案:

答案 0 :(得分:0)

似乎其中一个构造函数具有一个字符串参数。

您可以将该构造函数包装在另一个以另一种方式获取参数的类中:

class MyWrapper : ClassThatHasAStringParameter
{
    public MyWrapper()
       : base("PARAMETER_VALUE")
    {
    }
}