Having Enterprise Library 5.0 use app.config [Answered]RSS

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  Frenz

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  Having Enterprise Library 5.0 use app.config

  Nov 19, 2010 12:04 AM|Frenz|LINK

  Hi,

  I have a Solution which contains a Web project and a Class Library project. The Class library project contains Enterprise library 5.0 and app.config. When I try to perform a Microsoft.Practices.EnterpriseLibrary.Logging.Logger.Write, I get the following exception:

   

  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)

   

  If I move all the class files to the web project and have the Enterprise library configuration in the Web.config, everything works fine. I guess the issue is that the Enterprise library is not detecting the app.config which contains all the configuration. How can I have my enterprise library use the App.config present in its prroject.

   

  Kindly help me with this regard.

  Thanks in advance.

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  DarrellNorto...

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  Re: Having Enterprise Library 5.0 use app.config

  Nov 19, 2010 05:43 AM|DarrellNorton|LINK

  You need to add a few settings in the web.config to point to an external (non web.config) config file:

  http://www.pnpguidance.net/Post/EnterpriseLibraryExternalConfigurationSourceApplicationBlockSettings.aspx

  Darrell Norton, MVP
  Darrell Norton's Blog
  Please click "Mark as Answer" if this helped you.
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  dionisifam

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  Re: Having Enterprise Library 5.0 use app.config

  Jan 04, 2011 04:36 AM|dionisifam|LINK

  hi,
  I have the same problem experienced by Frenz:

  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)

  
  I read the configuration file using the following code:

  
              Dim container As New UnityContainer
              Dim configurator = New UnityContainerConfigurator(container)
              ' Read the configuration files and set up the container.
              EnterpriseLibraryContainer.ConfigureContainer(configurator, New FileConfigurationSource("file.config"))
              _LogWriter = container.Resolve(Of LogWriter)()
              ' add custom listener to logWriter
              If IsLogging Then
  
                  Dim collList As New List(Of TraceListener)
                  Dim dbTraceList As TraceListener = Nothing
                  Dim dblogSource As LogSource = Nothing
  
                  dbTraceList = New SIALogListener(_connLog, _databaseLog)
                  collList.Add(dbTraceList)
                  dblogSource = New LogSource("CustomDBLog", collList, SourceLevels.All)
                  dblogSource.AutoFlush = True
                  _LogWriter.TraceSources("General").Listeners.Add(dbTraceList)
  
              End If

  to avoid connecting to the app or web.config file
  
  The library works perfectly. NET but loading it from VB6 COM interop mode is evident in the error that I write.
  
  Can you help or suggest possible solutions?
  What seems strange to me is that the dll in a VS2010 function perfectly and highlights the problem only in the VB6
  
  Thanks
  Regards