log4net更改web.config表单中的LogLevel测试代码

Question

Here is log4net config section from my service web.config :

<log4net>
  <appender name="OutputDebugStringAppender">
    ...
  </appender>
  <appender name="RollingFileAppender">
    ...
  </appender>
  <appender name="EventLogAppender" type="log4net.Appender.EventLogAppender">
    ...
  </appender>
  <root>
    <level value="INFO"/>
    <appender-ref ref="OutputDebugStringAppender"/>
    <appender-ref ref="RollingFileAppender"/>
    <appender-ref ref="EventLogAppender"/>
  </root>
</log4net>

I would like to change <level value="INFO"/> to <level value="DEBUG"/> during functional test (C#) preparation by hooking to existing web.config file.

---EDIT---

To make thing clear. This is not unit test. This is E2E test working on production service artifacts deployed to test-env. The only thing I can do is to modify web.config file.

!---EDIT---

Currently, I have two ideas:

1) Parse web.config as XML file,

2) Use regex (I know that I'll have two problems then :) )

I wonder if there is a universal way to change log level (maybe some kind of log4net configuration API for C#?)

What is the best solution to achieve this?

Answer 1

There is no need to edit your config files. You can change to loglevel at runtime with in you test classes:

((log4net.Repository.Hierarchy.Hierarchy)LogManager.GetRepository()).Root.Level = Level.Debug;
((log4net.Repository.Hierarchy.Hierarchy)LogManager.GetRepository()).RaiseConfigurationChanged(EventArgs.Empty);

Answer 2

Sometimes the simplest solutions are the best solutions. I've abandoned searching for log4net mechanisms and regex solutions. The final version is:

XmlDocument doc = new XmlDocument();
doc.Load(configFilePath);
XmlNode node = doc.SelectSingleNode("//log4net/root/level");
node.Attributes["value"].Value = "DEBUG";
doc.Save(configFilePath);