「新建AppDomain中的Web應用程序中無法構建LogWriter類型」

我試圖在Web應用程序中使用Microsoft Enterprise Library 5.0日誌記錄應用程序塊。我可以從主應用程序寫入日誌，但是當我從第二個AppDomain嘗試此操作時，任何嘗試登錄都會引發異常（如下所示）。「新建AppDomain中的Web應用程序中無法構建LogWriter類型」

完全相同的代碼在控制檯應用程序中工作正常。我已經把範圍縮小到下面的測試代碼（只需要改變裝配和類型名稱常量到適合自己的項目）：

public class LogTester 
{ 
    public const string LogWriterAssembly = "LogTest"; 
    public const string LogWriterType = "LogTest.LogWriter"; 

    public static void DoLogTest() 
    { 
     LogWriter localLogger = new LogWriter(); 
     localLogger.Log("In first AppDomain"); 

     AppDomain domain = GetAppDomain(); 

     LogWriter remoteLogger = (LogWriter)domain.CreateInstanceAndUnwrap(LogWriterAssembly, LogWriterType); 
     remoteLogger.Log("In second AppDomain"); 
    } 

    private static AppDomain GetAppDomain() 
    { 
     string baseFolder = AppDomain.CurrentDomain.BaseDirectory; 

     string folder = AppDomain.CurrentDomain.SetupInformation.PrivateBinPath; 

     if (String.IsNullOrEmpty(folder)) 
      folder = baseFolder; 

     AppDomainSetup setup = new AppDomainSetup(); 
     setup.ApplicationName = "TestAppName"; 
     setup.ApplicationBase = baseFolder; 
     setup.PrivateBinPath = folder; 
     setup.ShadowCopyFiles = "true"; 

     return AppDomain.CreateDomain("TestAppName", null, setup); 
    } 
} 

public class LogWriter : MarshalByRefObject 
{ 
    public void Log(string message) 
    { 
     Logger.Write(AppDomain.CurrentDomain.FriendlyName + ": " + message); 
    } 
}

我使用的日誌記錄配置與缺省（由企業創建庫配置實用程序）：

<configSections> 
    <section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" /> 
</configSections> 
<loggingConfiguration name="" tracingEnabled="true" defaultCategory="General"> 
    <listeners> 
     <add name="Event Log Listener" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.FormattedEventLogTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" 
      listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FormattedEventLogTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" 
      source="Enterprise Library Logging" formatter="Text Formatter" 
      log="" machineName="." traceOutputOptions="None" /> 
    </listeners> 
    <formatters> 
     <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" 
      template="Timestamp: {timestamp}{newline}&#xA;Message: {message}{newline}&#xA;Category: {category}{newline}&#xA;Priority: {priority}{newline}&#xA;EventId: {eventid}{newline}&#xA;Severity: {severity}{newline}&#xA;Title:{title}{newline}&#xA;Machine: {localMachine}{newline}&#xA;App Domain: {localAppDomain}{newline}&#xA;ProcessId: {localProcessId}{newline}&#xA;Process Name: {localProcessName}{newline}&#xA;Thread Name: {threadName}{newline}&#xA;Win32 ThreadId:{win32ThreadId}{newline}&#xA;Extended Properties: {dictionary({key} - {value}{newline})}" 
      name="Text Formatter" /> 
    </formatters> 
    <categorySources> 
     <add switchValue="All" name="General"> 
      <listeners> 
       <add name="Event Log Listener" /> 
      </listeners> 
     </add> 
    </categorySources> 
    <specialSources> 
     <allEvents switchValue="All" name="All Events" /> 
     <notProcessed switchValue="All" name="Unprocessed Category" /> 
     <errors switchValue="All" name="Logging Errors &amp; Warnings"> 
      <listeners> 
       <add name="Event Log Listener" /> 
      </listeners> 
     </errors> 
    </specialSources> 
</loggingConfiguration>

在控制檯應用程序中，所有工作正常，都寫入日誌消息。在一個Web應用程序，但是，我想寫第二消息時出現以下情況例外：

[InvalidOperationException: The type LogWriter cannot be constructed. You must configure the container to supply this value.] 

[ResolutionFailedException: Resolution of the dependency failed, type = "Microsoft.Practices.EnterpriseLibrary.Logging.LogWriter", name = "(none)". 
Exception occurred while: while resolving. 
Exception is: InvalidOperationException - The type LogWriter cannot be constructed. You must configure the container to supply this value. 
----------------------------------------------- 
At the time of the exception, the container was: 

    Resolving Microsoft.Practices.EnterpriseLibrary.Logging.LogWriter,(none) 
] 

[ActivationException: Activation error occured while trying to get instance of type LogWriter, key ""] 
    System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) +10582079 
    System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) +336 
    MvcApplication1.Controllers.LogWriter.Log(String message) in c:\dev\Sage Data Cloud\Development\MvcApplication1\MvcApplication1\Controllers\DefaultController.cs:65 
    MvcApplication1.Controllers.LogTester.DoLogTest() in c:\dev\Sage Data Cloud\Development\MvcApplication1\MvcApplication1\Controllers\DefaultController.cs:38 
    MvcApplication1.Controllers.DefaultController.Index() in c:\dev\Sage Data Cloud\Development\MvcApplication1\MvcApplication1\Controllers\DefaultController.cs:18 
    lambda_method(Closure , ControllerBase , Object[]) +101 
    System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +59 
    System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +435 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +60 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.InvokeSynchronousActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +50 
    System.Web.Mvc.Async.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41() +75 
    System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +44 
    System.Web.Mvc.Async.WrappedAsyncResult`1.End() +139 
    System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +102 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +49 
    System.Web.Mvc.Async.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33() +126 
    System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +323 
    System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeActionMethodWithFilters>b__36(IAsyncResult asyncResult) +44 
    System.Web.Mvc.Async.WrappedAsyncResult`1.End() +139 
    System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +102 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +50 
    System.Web.Mvc.Async.<>c__DisplayClass2a.<BeginInvokeAction>b__20() +68 
    System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) +184 
    System.Web.Mvc.Async.WrappedAsyncResult`1.End() +136 
    System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +56 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +40 
    System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +40 
    System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +47 
    System.Web.Mvc.Async.WrappedAsyncResult`1.End() +151 
    System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59 
    System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40 
    System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +44 
    System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +47 
    System.Web.Mvc.Async.WrappedAsyncResult`1.End() +151 
    System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59 
    System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40 
    System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +39 
    System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +39 
    System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +45 
    System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +47 
    System.Web.Mvc.Async.WrappedAsyncResult`1.End() +151 
    System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59 
    System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40 
    System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +40 
    System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +38 
    System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9629708 
    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

我有需要的企業庫程序集的引用，所以記日誌，的serviceLocation，團結和Unity.Configuration組件是本地複製。

我試過使用.NET Reflector調試到企業庫代碼中，但創建對象都是使用動態生成的代碼，我無法進入（我不想進入嘗試反向工程師從未註釋的反編譯源！）。

想知道有沒有人遇到過這個問題，以及可能的解決方案？無法在其他地方找到同樣的問題。

在此先感謝。 Pete

來源

2013-06-20 Peter Reay

願這[鏈接]（http://stackoverflow.com/questions/12950547/unity-the-type-logwriter-cannot-be-constructed）幫助。 – wonko79

謝謝，但不幸的是，我試圖在寫入日誌之前添加行var container = new UnityContainer（）.AddNewExtension （）在第二個AppDomain中運行，但它不能解決問題。 –

您需要設置新的AppDomain的配置文件，以便可以在新的AppDomain中配置Enterprise Library。您可以使用AppDomainSetup.ConfigurationFile屬性做到這一點：

AppDomainSetup setup = new AppDomainSetup(); 
setup.ApplicationName = "TestAppName"; 
setup.ApplicationBase = baseFolder; 
setup.PrivateBinPath = folder; 
setup.ShadowCopyFiles = "true"; 
setup.ConfigurationFile = 
    AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;

來源

2013-06-20 17:37:10

太好了。這工作，非常感謝。沒有意識到設置'ConfigurationFile'屬性是如此簡單。必須在Web應用程序和控制檯應用程序之間的配置處理中有一些細微差別... –

「新建AppDomain中的Web應用程序中無法構建LogWriter類型」

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