log4net configuration - failed to find section

Question

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>

I have this error message, but my Logger works fine. – MikroDel Nov 01 '13 at 11:00 — MikroDel, Nov 01 '13 at 11:00

score 28 · Answer 1 · edited Dec 01 '16 at 10:02

28

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.

edited Dec 01 '16 at 10:02

ErikE

46,564
22
147
188

answered Jul 04 '13 at 11:33

Peter

27,049
8
63
82

"Are you calling XmlConfigurator.Configure() somewhere?" - no – MikroDel Jul 04 '13 at 11:38
This worked. I guess XmlConfigurator.Configure() isn't used anymore?? This is how I've always done it. I never had to modify the assembly.cs. I better read the latest documentation. – goku_da_master Sep 02 '15 at 19:30
Thank you, this worked, however oddly, I had that line (log4net.Config.XmlConfigurator.Configure();) in another program and I did not get the log4net error. However, I feel this is a legitimate solution to the OP issue. – j.hull May 22 '19 at 19:16

score 6 · Answer 2 · edited Oct 15 '14 at 14:13

6

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);

edited Oct 15 '14 at 14:13

Ryan Kohn

12,541
11
53
80

answered Jul 04 '13 at 11:22

Siraj Mansour

2,462
1
16
31

thanks for your answer Siraj. Tried it and nothing happend - the same error message – MikroDel Jul 04 '13 at 11:26
Check my Edit and try this piece of code on your "AppStart" or the point execution starts on your application – Siraj Mansour Jul 04 '13 at 12:04
Don't forget to add reference to the system.configuration assembly. and add "using System.Configuration" – Siraj Mansour Jul 04 '13 at 12:05
It all doesnt helped me, but as I see my Logger works fine event with errot message. But to solve it will be fine ) – MikroDel Nov 01 '13 at 11:06
@SirajMansour 's EDIT was the solution for me. I had to do this after upgrading from .NET 4.0 to 4.5.2. – realmikep Dec 03 '15 at 01:26

log4net configuration - failed to find section

2 Answers2

Linked