每个配置文件中只允许存在一个 <configSections> 元素，并且，如果存在该元素，它还必须是根 <configuration> 元素的第一个子元素。

 

问题：

I have this code in web.config:

And I have downloaded log4net.dll and placed it in Bin Folder.

In one of My aspx.cs pages I have added this code:

using log4net;[assembly: log4net.Config.XmlConfigurator(Watch = true)]private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

But it's giving error as Unrecognized configuration section log4net.

 

解决方案：

You need to declare the log4net section:

Take a closer look at the documentation which explains the necessary things to do.