automapper - 当程序集依赖于 Automapper 时处理 onStart 时出现 NService Bus 异常

Question

我们有一个程序集使用对 Automapper.dll 的引用。在启动时以订阅者身份启动 NServiceBus 失败，并显示以下消息:

Exception when starting endpoint, error has been logged. Reason: Could not load file or assembly 'file:///D:\Main\Src\Core\Core.MessageHandler\bin\Debug\AutoMapper.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)

堆栈跟踪:

Server stack trace: 
       at Magnum.StateMachine.ExceptionActionDictionary`1.HandleException(T stateMachine, Event event, Object parameter, Exception exception)
       at Magnum.StateMachine.EventActionList`1.Execute(T stateMachine, Event event, Object parameter)
       at Magnum.StateMachine.EventActionBase`1.Execute(T instance, Event event, Object parameter)
       at Magnum.StateMachine.State`1.RaiseEvent(T instance, BasicEvent`1 eevent, Object value)
       at Magnum.StateMachine.StateMachine`1.RaiseEvent(Event raised)
       at Topshelf.Internal.ServiceController`1.Start()
       at Topshelf.Internal.IsolatedServiceControllerWrapper`1.Start()
       at Topshelf.Internal.ServiceControllerProxy.Start()
       at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs)
       at System.Runtime.Remoting.Messaging.StackBuilderSink.PrivateProcessMessage(RuntimeMethodHandle md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs)
       at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg, Int32 methodPtr, Boolean fExecuteInContext)

    Exception rethrown at [0]: 
       at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
       at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
       at Topshelf.Internal.ServiceControllerProxy.Start()
       at Topshelf.Internal.FacadeToIsolatedServiceController`1.Start()
       at Topshelf.Internal.ServiceCoordinator.Start()
       at Topshelf.Internal.Hosts.ConsoleHost.Run()
       at Topshelf.Internal.Actions.RunAsConsoleAction.Do(IRunConfiguration configuration)
       at Topshelf.Runner.Host(IRunConfiguration configuration, String[] args)
       at NServiceBus.Host.Program.Main(String[] args)

文件“Automapper.dll”存在! Config中没有问题。我检查了这个删除对 AutoMapper.dll 的依赖并且它有效。

配置如下:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="MsmqTransportConfig" 
             type="NServiceBus.Config.MsmqTransportConfig, NServiceBus.Core" />
    <section name="Logging" type="NServiceBus.Config.Logging, NServiceBus.Core" />
  </configSections>

  <MsmqTransportConfig 
    InputQueue="MyQueue@localhost" 
    NumberOfWorkerThreads="1" 
    MaxRetries="10" 
    ErrorQueue="ErrorQueue@localhost" />

  <Logging Threshold="WARN" />

</configuration>

有什么想法吗？ NServiceBus 中的 AutoMapper 依赖项是否存在已知问题？

Answer 1

在您的端点配置类 (IConfigureThisEndpoint) 中，通常也实现 IWantCustomInitialization。作为自定义初始化的一部分，您可以指定以下内容:

public void Init()
{
    Configure.With(AllAssemblies.Except("Automapper.dll"))
        .AutofacBuilder()
        .Log4Net(); // etc.
}

“AllAssemblies.Except()”代码指示 NServiceBus 配置完全忽略 Automapper 程序集。

另一个可能导致该问题的潜在问题是，如果您使用的是针对 CLR v2.0 (.NET v3.5) 编译的 NServiceBus.Host.exe，而 Automapper 是针对 CLR v4.0 (.NET) 编译的4.0)。根据您的 CLR 版本，有多个 NServiceBus 版本。您可能需要尝试运行 CLR v4.0 版本，将 Automapper 更改为 .NET 3.5 版本(我认为该版本尚未积极开发)。