log4net configuration - failed to find section

问题

This is my error message:

log4net:ERROR XmlConfigurator: Failed to find configuration section 'log4net' in the application's .config file. Check your .config file for the <log4net> and <configSections> elements. The configuration section should look like: <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />

this is my web.config:

<?xml version="1.0"?>
<configuration>
    <configSections>
       <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
    </configSections>

   <system.serviceModel>
   ...
   </system.serviceModel>

   <connectionStrings>
   ...
   </connectionStrings>

   <log4net>
   ...
   </log4net>

</configuration>

What is wrong with my config?

Update:

Have also Web.Release.config:

<?xml version="1.0"?>    
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">

    <system.web>
        <compilation xdt:Transform="RemoveAttributes(debug)" />
    </system.web>

    <system.serviceModel>
    ...
    </system.serviceModel>

    <connectionStrings>
    ...
    </connectionStrings>

    <log4net>
    ...   
       <root>
          <level value="DEBUG" xdt:Transform ="Replace"/>
       </root>
    </log4net>

</configuration>

Web.Test.cofig - the same as Release one

and Web.Debug.config, that is empty:

<?xml version="1.0"?>

<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">    

</configuration>

回答1:

Are you calling XmlConfigurator.Configure() somewhere?

Remove those calls and only add the [assembly: log4net.Config.XmlConfigurator(Watch = true)] attribute.

Normally it is easier to configure log4net in a separate file. Create a file log4net.config and change your attribute to:

[assembly: log4net.Config.XmlConfigurator(ConfigFile = "Log4Net.config", Watch = true)]

Remove the section in your web.config.

回答2:

Nothing seems wrong with defining the section under <configSections>.

Try adding [assembly: log4net.Config.XmlConfigurator(Watch = true)] in your AssemblyInfo.cs in the properties folder of your project. This should do the trick in case your configuration is correct under the tag.

EDIT :

XmlElement log4NetSection = (XmlElement)ConfigurationManager.GetSection("log4net");
            log4net.Config.XmlConfigurator.Configure(log4NetSection);

来源：https://stackoverflow.com/questions/17468841/log4net-configuration-failed-to-find-section

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