Autofac 范围生命周期问题

Question

我有 ASP.NET MVC 应用程序，我在其中注册了一个具有InstancePerHttpRequest作用域的组件。

builder.RegisterType<Adapter>().As<IAdapter>().InstancePerHttpRequest();

然后我有一段异步代码，我正在解析适配器组件。

下面的代码是简化的

Task<HttpResponseMessage> t = Request.Content.ReadAsMultipartAsync(provider).ContinueWith(t =>

      // IHandleCommand<T> takes an IAdapter as contructor argument
      var h = DependencyResolver.Current.GetServices<IHandleCommand<T>>();
);

上面的代码抛出异常： The request lifetime scope cannot be created because the HttpContext is not available.

所以我对这个主题做了一些研究，找到了这个答案 /sf/answers/606411501/

然后我将解析代码调整为此

 using (var c= AutofacDependencyResolver.Current.ApplicationContainer.BeginLifetimeScope(x => x.RegisterType<DataAccessAdapter>().As<IDataAccessAdapter>).InstancePerLifetimeScope()))
 {
       var h = DependencyResolver.Current.GetServices<IHandleCommand<T>>();
 }

但例外情况保持不变。 The request lifetime scope cannot be created because the HttpContext is not available.

我错过了什么吗？

Answer 1

你可以尝试这样的事情：

using (var c= AutofacDependencyResolver.Current
                                       .ApplicationContainer
                                       .BeginLifetimeScope("AutofacWebRequest"))
{
   var h = DependencyResolver.Current.GetServices<IHandleCommand<T>>();
}