配置文件中的节类型

Question

I'm using log4net for the first time, and I can't figure out how to add the appropriate config settings. All the documentation is pretty consistent about adding a <log4net> section to the app.config file, but for it to compile correctly, don't I also need to outline my configSections ?

I have the following right now:

<configuration>
  <configSections>
    <section name="system.serviceModel"/>
    <section name="appSettings" type="System.Configuration.ConfigurationManager"/>
    <section name="log4net"
       type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
    <section name="startup" />
  </configSections>
  <system.serviceModel>
   ...
  </system.serviceModel>
  <appSettings>
   ...
  </appSettings>
  <log4net>
  ...
  </log4net>
  <startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup>
</configuration>

But I'm receiving the following errors:

• XML document must contain a root level element
• The required attribute 'type' is missing (from system.serviceModel and startup )
• Could not find schema information for the element * (*=everything in log4net)

I've read a couple posts on section groups, and I've considered setting up the appSettings and log4net in a separate config file. This is a little over my head.

Should I be using separate config files?

If I should be putting everything in one config file, how do I know what type a section is? (I'm guessing on the appSettings type based on the assembly I use to get the settings--and I got the type for log4net from the many posts including it.)

Answer 1

Remove the duplicate declaration in the configSections for "appSettings", "system.serviceModel", "startup" .
They are already declared in the file machine.config installed by the Framework in the appropriate subfolder of C:\\WINDOWS\\Microsoft.Net

<?xml version="1.0"?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,Log4Net" />
  </configSections>
  <appSettings>
     ....
  </appSettings>
  <log4net>
    <root>
       .....
    </root>
    <appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">
       .....
    </appender>
  </log4net>
  <system.serviceModel>
      ....
  </system.serviceModel>
</configuration>

also be sure that your config file starts with <?xml version="1.0"?>