EntLib5: Loggin application block not logging to Event Log (exception: type LogWriter cannot be constructed)- Can anyone help?

Question

HI there,

I just setup the logging application block part of Enterprise Library 5. I think i have done it correct but its not logging to the event log it errors on the write method and gives me the following exception.

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

Can anyone do me a check or tell me what i am missing..

First of all i am running in windows 7 with a winforms application.

Here is my method that creates the log and you see the write method.

public class Logger : ILogger
{
    public void SendTest(string test)
    {
        LogEntry log = new LogEntry();
        log.EventId = 300;
        log.Message = test;
        log.Categories.Add("testing");
        log.Severity = TraceEventType.Information;
        log.Priority = 5;
        Microsoft.Practices.EnterpriseLibrary.Logging.Logger.Write(log);

    }
}

All my configs were built using the entlib5 editor and not by hand. And confirmed this si the path where entlib.config is

    filePath="C:\myapp\entlib.config" />

Here is my app.config which POINTS to my entlib.config

<?xml version="1.0"?>
<configuration>
<configSections>
    <section name="enterpriseLibrary.ConfigurationSource" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ConfigurationSourceSection, Microsoft.Practices.EnterpriseLibrary.Common, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" />
</configSections>
<enterpriseLibrary.ConfigurationSource selectedSource="System Configuration Source">
    <sources>
        <add name="System Configuration Source" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.SystemConfigurationSource, Microsoft.Practices.EnterpriseLibrary.Common, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
        <add name="File-based Configuration Source" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.FileConfigurationSource, Microsoft.Practices.EnterpriseLibrary.Common, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
            filePath="C:\myapp\entlib.config" />
    </sources>
    <redirectSections>
        <add sourceName="File-based Configuration Source" name="Redirected Section" />
    </redirectSections>
</enterpriseLibrary.ConfigurationSource>
<startup><supportedRuntime version="v2.0.50727"/></startup></configuration>

and here is my entlib.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, 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=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
                listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FormattedEventLogTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, 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=5.0.414.0, 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>
</configuration>

EDIT The question has been updated with the new app.config, to include

<redirectSections>
    <add sourceName="File-based Configuration Source" name="Redirected Section" />
</redirectSections>

I am still getting an error.

 Activation error occured while trying to get instance of type

LogWriter, key ""

and inner exception is

Resolution of the dependency failed, type = \"Microsoft.Practices.EnterpriseLibrary.Logging.LogWriter\", name = \"(none)\".\r\nException occurred while: while resolving.\r\nException is: InvalidOperationException - The type LogWriter cannot be constructed. You must configure the container to supply this value.\r\n-----------------------------------------------\r\nAt the time of the exception, the container was:\r\n\r\n Resolving Microsoft.Practices.EnterpriseLibrary.Logging.LogWriter,(none)\r\n"}

I used the EntLib configurator to create both files.

The entlib.config i accepted the default as it appears to have the EventLog listener included..

EDIT

this is my line in the entlib.config file, log is empty-- ermm is this correct?

    <add name="Event Log Listener" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.FormattedEventLogTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
        listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FormattedEventLogTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
        source="Enterprise Library Logging" formatter="Text Formatter"
        log="" machineName="." traceOutputOptions="None" />

EDIT

MY Logger.write is in a dll but my app.config / entlib.config are in a winforms app.. the winforms app has a reference to the dll project where i write the log.

Both the dll and the winforms has a reference to

   Microsoft.Practices.EnterpriseLibrary.Logging

and also using unity, has

   Microsoft.Practices.Unity

   Microsoft.Practices.Unity.Interception

Answer 1

Martin, you've created a file-based configuration source, but you haven't redirected the logging section to it.

Add the following to App.config inside enterpriseLibrary.ConfigurationSource node:

<redirectSections>
      <add sourceName="File-based Configuration Source" name="loggingConfiguration" />
</redirectSections>

In addition, I recommend the Configuration Sources Labs from the Enterprise Library 5.0 Hands-on Labs set. It covers this and more advanced scenarios.