我们正在使用带有.NET Core的log4net库来编写日志文件。但是我们在执行应用程序“log4net:ERROR ConfigureFromXml with null'lelement'parameter'时遇到此错误。 这是我们的Program.cs文件:
public class Program
{
public static void Main(string[] args)
{
XmlDocument log4netConfig = new XmlDocument();
log4netConfig.Load(File.OpenRead("log4net.config"));
var repo = log4net.LogManager.CreateRepository(Assembly.GetEntryAssembly(), typeof(log4net.Repository.Hierarchy.Hierarchy));
log4net.Config.XmlConfigurator.Configure(repo, log4netConfig["log4net"]);
BuildWebHost(args).Run();
}
public static IWebHost BuildWebHost(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>()
.Build();
}
这是Startup.cs文件中的Configure方法:
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
loggerFactory.AddConsole(LogLevel.Trace);
loggerFactory.AddLog4Net();
app.UseIdentityServer();
}
这是log4net.config文件:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=1b44e1d426115821" />
</configSections>
<!-- Log4net Logging Setup -->
<log4net>
<appender name="FileAppender" type="log4net.Appender.FileAppender,log4net">
<file value="c:\LogFiles\Applications\IdentityServer\log.txt" />
<appendToFile value="true" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %level %logger - %message%newline" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<levelMin value="INFO" />
<levelMax value="FATAL" />
</filter>
</appender>
<root>
<level value="DEBUG"/>
<appender-ref ref="FileAppender"/>
</root>
</log4net>
</configuration>
答案 0 :(得分:1)
实际上,接受的响应不准确,XML的问题是在log4net配置之上的.NET配置。原始配置文件是.NET配置文件,而不是log4net文件,它的根目录是 configuration 节点,而不是 log4net 节点。
另一方面,第二个配置XML是正确的,但是它正在替换原始配置(可以肯定是一个更好的配置),不仅解决了问题,而且用新的替换了原始配置。
对此更改的更好响应是:
从原始xml文件中删除 configuration 根节点以及 configSections 节点,并将log4net节点保留为XML的根目录,从而导致:>
<?xml version="1.0" encoding="utf-8" ?>
<!-- Log4net Logging Setup -->
<log4net>
<appender name="FileAppender" type="log4net.Appender.FileAppender,log4net">
<file value="c:\LogFiles\Applications\IdentityServer\log.txt" />
<appendToFile value="true" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %level %logger - %message%newline" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<levelMin value="INFO" />
<levelMax value="FATAL" />
</filter>
</appender>
<root>
<level value="DEBUG"/>
<appender-ref ref="FileAppender"/>
</root>
</log4net>
根据需要使用滚动附加程序重新配置附加程序...