我用C#编写了一个测试控制台应用程序,使用log4net:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using log4net;
using log4net.Config;
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
namespace Log4Net_Test
{
class Program
{
private static readonly ILog log = LogManager.GetLogger(typeof(Program));
static void Main(string[] args)
{
log.Info("Entering application");
log.Debug("Debug message");
log.Info("Leaving application");
}
}
}
我的 App.config
文件如下:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<appSettings>
<add key="log4net.Internal.Debug" value="true"/>
</appSettings>
<log4net>
<!-- A1 is set to be a ConsoleAppender -->
<appender name="A1" type="log4net.Appender.FileAppender">
<file value="logfile.txt" />
<appendToFile value="false" />
<!-- A1 uses PatternLayout -->
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%-4timestamp [%thread] %-5level %logger %ndc - %message%newline" />
</layout>
</appender>
<!-- Set root logger level to DEBUG and its only appender to A1 -->
<root>
<level value="DEBUG" />
<appender-ref ref="A1" />
</root>
</log4net>
</configuration>
执行测试程序会得到以下错误消息:
log4net:ERROR Exception while reading ConfigurationSettings. Check your .config
file is well formed XML.
System.Configuration.ConfigurationErrorsException: Configuration system failed t
o initialize ---> System.Configuration.ConfigurationErrorsException: Unrecognize
d configuration section log4net.
我的配置文件有什么问题?
更新1: 正如被接受的答案所指出的那样,configSections部分缺失。但是我还必须删除startup部分,否则会出现相同的错误。我不知道为什么startup部分也会导致问题。也许更有经验的人可以解释并留下评论。