这是我的 WCF(vs2015@net452) autofac (v4.6.1) 设置:
MyService.dll:
builder.Register(c => (ISession)RemoteObjectFactory.GetInstance(typeof(MySessionBase))).As<ISession>().SingleInstance();
...
var session = AutofacHostFactory.Container.Resolve<ISession>();
<Message>An exception was thrown while executing a resolve operation. See the InnerException for details.
Could not load file or assembly "MyRemotingHost, Version=1.0.6442.29085, Culture=neutral, PublicKeyToken=null" or one of its dependencies. File not found(See inner exception for details.)</Message>
<StackTrace>at Autofac.Core.Resolving.ResolveOperation.Execute(IComponentRegistration registration, IEnumerable`1 parameters)
at Autofac.ResolutionExtensions.TryResolveService(IComponentContext context, Service service, IEnumerable`1 parameters, Object& instance)
at Autofac.ResolutionExtensions.ResolveService(IComponentContext context, Service service, IEnumerable`1 parameters)
at Autofac.ResolutionExtensions.Resolve[TService](IComponentContext context, IEnumerable`1 parameters)
at My.DoSomeWork() at C:\Projects\...
<Type>Autofac.Core.DependencyResolutionException</Type>
MyService.dll
指的是MyDefs.dll
。
MyRemotingHost.dll
指的是MyDefs.dll
。
MyService.dll
MyRemotingHost.dll
通过远程调用。RemoteObjectFactory.GetInstance
是一个包装器方法,它返回(通过远程处理)透明代理到MySession
对象MyRemotingHost.dll
。
抽象类MySessionBase
实现ISession
. 两者都在 中定义MyDefs.dll
。
类MySession
是 的子类,MySessionBase
并在 中定义MyRemotingHost.dll
。
严格来说MyService.dll
不知道也不MyRemotingHost.dll
应该知道。为什么 autofac 会尝试获取有关此远程程序集的信息?
更新
ISession session = (MySessionBase)RemoteObjectFactory.GetInstance(typeof(MySessionBase));
builder.RegisterInstance(session);
RegisterInstance 抛出同样的错误。
Update2第二次(及后续)解析尝试不会抛出奇怪的错误。
builder.Register(c => (ISession)RemoteObjectFactory.GetInstance(typeof(MySessionBase))).As<ISession>().SingleInstance();
...
var session1 = AutofacHostFactory.Container.Resolve<ISession>();
var session2 = AutofacHostFactory.Container.Resolve<ISession>();
行var session1 = ...
抛出错误。如果错误被抑制,则下一行var session2 = ...
不会产生错误。
基于 PDB 的逐步调试显示错误源在第一次调用枚举器时位于Autofac.Core.Resolving.ResolveOperation
内部foreach
循环:
private void CompleteActivations()
{
var completed = _successfulActivations;
ResetSuccessfulActivations();
foreach (var activation in completed)
activation.Complete();
}
我无法进行更多调查,因为我坚持使用 VS2015,而 autofac 源已经具有 VS2017 格式。
问题出在log4net autofac 模块中:
var instanceType = instance.GetType();
在该行之前添加检查可以解决问题:
// cant use GetType() on TransparentProxy as it may throw error
if (RemotingServices.IsTransparentProxy(instance)) return;
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我来说两句