blocks|key|906858|text|这种情况的一个问题是，通过在AssemblyInfo.cs中放置以下行，确保将XmlConfigurator属性添加到程序集中|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|906859|[assembly:+log4net.Config.XmlConfigurator]|code-block|syntax|javascript|906860|否则log4net永远不会激活。|906861|entityMap^0|E|F|13|F|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

One gotcha for this type of thing is to make sure to add the <code>XmlConfigurator</code> attribute to the assembly by placing the following line in your <code>AssemblyInfo.cs</code>:

<pre><code>[assembly: log4net.Config.XmlConfigurator]
</code></pre>

Otherwise log4net never activates.

blocks|key|906922|text|<param+name="File"+value="mylog.log"+/>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|906923|写着“将mylog.log写入实际文件夹”。这意味着如果你的webapp在IIS下，那么日志将被写入C:\inetpub\wwwroot\appname\mylog.log。|unstyled|906924|如果日志文件不在那里，则可能是运行应用程序的帐户对文件夹没有写权限。您可以从SysInternals运行进程监视器，以查看文件是否写入以及写入位置。|906925|还可以在调试模式下运行VS，查看是否抛出了任何异常(+debug+->+exceptions+->CLR+Exceptions，检查抛出的异常)。|906926|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>&lt;param name="File" value="mylog.log" /&gt;
</code></pre>

is saying "write mylog.log to actual folder". This means that if your webapp is under IIS, then log will be written to C:\inetpub\wwwroot\appname\mylog.log.

If log file is not there, then maybe account under which is app running doesn't have write permission on folder. You can run Process Monitor from SysInternals to see if and where a file is written.

Also run VS in debug mode, to see if any exceptions are thrown (Debug->Exceptions->CLR Exceptions, check Thrown).

blocks|key|906974|text|还有一个小陷阱，请看这里：http://logging.apache.org/log4net/release/manual/configuration.html#dot-config|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|906975|对于app.config，[assembly:+log4net.Config.XmlConfigurator]方法不起作用。如果从app.config配置log4net，则必须使用log4net.Config.XmlConfigurator.Configure()方法。|style|CODE|906976|entityMap|0|LINK|mutability|MUTABLE|url|http://logging.apache.org/log4net/release/manual/configuration.html#dot-config^0|D|26|0|0|D|16|2I|16|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@$A|U|B|V|F|G]|$A|W|B|X|F|G]]|9|@]|C|$]]|$1|H|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

There is another small gotcha, see here: <a href="http://logging.apache.org/log4net/release/manual/configuration.html#dot-config">http://logging.apache.org/log4net/release/manual/configuration.html#dot-config</a>

the <code>[assembly: log4net.Config.XmlConfigurator]</code> method doesn't work with app.config. If you configure log4net from app.config, you must use the <code>log4net.Config.XmlConfigurator.Configure()</code> method.

blocks|key|1121950|text|几个小时后，我明白了为什么它对我不起作用……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1121951|我有：|1121952|public+static+class+Program
{

++++private+static+CommunicationManager+_bcScanner+=+new+CommunicationManager();
++++private+static+ILog+_log+=+LogManager.GetLogger(typeof(Program));
++++private+static+SocketServer+socketListener;|code-block|syntax|javascript|1121953|但它应该是：|1121954|public+static+class+Program
++++{
++++++++private+static+ILog+_log+=+LogManager.GetLogger(typeof(Program));
++++++++private+static+CommunicationManager+_bcScanner+=+new+CommunicationManager();
++++++++private+static+SocketServer+socketListener;|1121955|因此，请确保ILog在第一行...|1121956|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Also after some hours, I figured out why it wasn't working for me...

i had:

<pre><code>public static class Program
{

 private static CommunicationManager _bcScanner = new CommunicationManager();
 private static ILog _log = LogManager.GetLogger(typeof(Program));
 private static SocketServer socketListener;
</code></pre>

but it should be:

<pre><code>public static class Program
 {
 private static ILog _log = LogManager.GetLogger(typeof(Program));
 private static CommunicationManager _bcScanner = new CommunicationManager();
 private static SocketServer socketListener;
</code></pre>

So make sure the ILog is on the first line....

blocks|key|907083|text|对于ASP.NET+MVC项目，添加|type|unstyled|depth|inlineStyleRanges|entityRanges|data|907084|log4net.Config.XmlConfigurator.Configure();|code-block|syntax|javascript|907085|对Global.asax.cs也有帮助：|907086|public+class+MvcApplication+:+System.Web.HttpApplication
{
++++protected+void+Application_Start()
++++{
++++++++AreaRegistration.RegisterAllAreas();

++++++++WebApiConfig.Register(GlobalConfiguration.Configuration);
++++++++FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
++++++++RouteConfig.RegisterRoutes(RouteTable.Routes);
++++++++BundleConfig.RegisterBundles(BundleTable.Bundles);
++++++++AuthConfig.RegisterAuth();

++++++++log4net.Config.XmlConfigurator.Configure();
++++}
}|907087|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For an ASP.NET MVC project adding 

<pre><code>log4net.Config.XmlConfigurator.Configure();
</code></pre>

to the Global.asax.cs also helps:

<pre><code>public class MvcApplication : System.Web.HttpApplication
{
 protected void Application_Start()
 {
 AreaRegistration.RegisterAllAreas();

 WebApiConfig.Register(GlobalConfiguration.Configuration);
 FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
 RouteConfig.RegisterRoutes(RouteTable.Routes);
 BundleConfig.RegisterBundles(BundleTable.Bundles);
 AuthConfig.RegisterAuth();

 log4net.Config.XmlConfigurator.Configure();
 }
}
</code></pre>

blocks|key|1122060|text|在我的示例中，我忘记将log4Net.config文件属性设置为"Content“，因此该文件不会包含在部署中。因此，请注意：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1122061|Compile+action+:+Content|code-block|syntax|javascript|1122062|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In my case I forget to set the log4Net.config file properties as "Content" so the file was not included in the deploy.
So pay attention on it:

<pre><code>Compile action : Content
</code></pre>

blocks|key|1122108|text|不幸的是，上述方法都没有帮助。除了前面的设置建议之外，要记录的类中的显式配置对我也起到了作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1122109|string+assemblyFolder+=+Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
log4net.Config.XmlConfigurator.Configure(new+FileInfo(assemblyFolder+%2B+"/log4net.config"));|code-block|syntax|javascript|1122110|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Unfortunately none of the above helped. Explicit configuration in the class to be logged additionaly to the previous settings suggestions did the trick for me.

<pre><code>string assemblyFolder = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
log4net.Config.XmlConfigurator.Configure(new FileInfo(assemblyFolder + "/log4net.config"));
</code></pre>

blocks|key|907319|text|在我这边，我忘了在编译应用程序时标记要复制的配置文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|907320|​|907321|📷|atomic|offset|length|907322|907323|只需右键单击log4net.config文件，选择属性，然后选择复制到要复制XXXX的输出目录|907324|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/481ce33cfabf0a8f95e8806945878524.png|imageAlt^0|0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@$G|X|H|Y|1|Z]]|A|$]]|$1|I|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S|T|-4]]]]

On my side, I forgot to mark the config file to be copied while the app is being compiled.

<a href="https://i.stack.imgur.com/P1fhE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/P1fhE.png" alt="Copy the config file to output directory"></a>

Just right click the log4net.config file, select property and then choose Copy to Output Directory to be Copy XXXX

blocks|key|1122274|text|检查报告级别是否设置为"Debug“或"ALL”。这抓住了我，我花了很长时间尝试调试我的log4net设置。我将它设置为错误，因为它没有错误，所以没有记录任何内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1122275|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Check your Reporting level is set to &quot;Debug&quot; or &quot;ALL&quot;.
This caught me and I spent ages trying to debug my log4net setup.
I had it set to Error and as it wasn't erroring it didn't log anything.

blocks|key|907448|text|因此，在公认的答案中，解决方案是将|type|unstyled|depth|inlineStyleRanges|entityRanges|data|907449|[assembly:+log4net.Config.XmlConfigurator]|code-block|syntax|javascript|907450|到AssemblyInfo.cs文件中。|offset|length|style|CODE|907451|此外，还有一条评论建议|907452|[assembly:+log4net.Config.XmlConfigurator(Watch+=+true)]|907453|但是，如果它仍然不起作用，请考虑配置log4net配置文件的名称(在我的示例中为log4net.config)：|907454|[assembly:+log4net.Config.XmlConfigurator(ConfigFile+=+"log4net.config")]|907455|在那之后，日志工作就像一个护身符。|907456|entityMap^0|0|0|1|F|0|0|0|14|E|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@$I|11|J|12|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|15|8|@$I|16|J|17|K|L]]|9|@]|A|$]]|$1|S|3|T|5|D|7|18|8|@]|9|@]|A|$E|F]]|$1|U|3|V|5|6|7|19|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|X|$]]

So, in the Accepted Answer, the solution was to put
<pre><code>[assembly: log4net.Config.XmlConfigurator]
</code></pre>
into the <code>AssemblyInfo.cs</code> File.
Also, there was a comment sugesting
<pre><code>[assembly: log4net.Config.XmlConfigurator(Watch = true)]
</code></pre>
however, if it is still not working, consider configuring the name of your log4net config file (<code>log4net.config</code> in my case):
<pre><code>[assembly: log4net.Config.XmlConfigurator(ConfigFile = &quot;log4net.config&quot;)]
</code></pre>
after that, logging worked like a charm.

blocks|key|1122408|text|除了所有其他答案之外，我的问题是我需要在我的启动类(WinForms示例)中调用GetLogger()：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1122409|static+class+Program
{
++++public+static+readonly+ILog+MainLog+=+LogManager.GetLogger("Main");

++++///+<summary>
++++///+The+main+entry+point+for+the+application.
++++///+</summary>
++++[STAThread]
++++static+void+Main()
++++{
++++++++Application.EnableVisualStyles();
++++++++Application.SetCompatibleTextRenderingDefault(false);
++++++++Application.Run(new+Form1());
++++}
}|code-block|syntax|javascript|1122410|我所有的“有意义的”日志语句都在一个DLL中，这个DLL对于log4net来说显然加载得太晚了。|1122411|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Aside from all the other answers, my problem that was I needed a call to GetLogger() in my start-up class (WinForms example):
<pre><code>static class Program
{
 public static readonly ILog MainLog = LogManager.GetLogger(&quot;Main&quot;);

 /// &lt;summary&gt;
 /// The main entry point for the application.
 /// &lt;/summary&gt;
 [STAThread]
 static void Main()
 {
 Application.EnableVisualStyles();
 Application.SetCompatibleTextRenderingDefault(false);
 Application.Run(new Form1());
 }
}
</code></pre>
All my 'meaningful' logging statements were in a DLL that is apparently loaded too late for log4net.

Hey I have this configuration in my web.config

<pre class="lang-xml prettyprint-override"><code>&lt;log4net&gt;
 &lt;appender name="LogFileAppender" type="log4net.Appender.FileAppender"&gt;
 &lt;param name="File" value="mylog.log" /&gt;
 &lt;param name="AppendToFile" value="true" /&gt;
 &lt;layout type="log4net.Layout.PatternLayout"&gt;
 &lt;param name="Header" value="" /&gt;
 &lt;param name="Footer" value="" /&gt;
 &lt;param name="ConversionPattern" value="%d [%t] %-5p %m%n" /&gt;
 &lt;/layout&gt;
 &lt;/appender&gt;
 &lt;appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender" &gt;
 &lt;layout type="log4net.Layout.PatternLayout"&gt;
 &lt;param name="Header" value="[Header]\r\n" /&gt;
 &lt;param name="Footer" value="[Footer]\r\n" /&gt;
 &lt;param name="ConversionPattern" value="%d [%t] %-5p %m%n" /&gt;
 &lt;/layout&gt;
 &lt;/appender&gt;
 &lt;root&gt;
 &lt;level value="DEBUG" /&gt;
 &lt;appender-ref ref="LogFileAppender" /&gt;
 &lt;appender-ref ref="ConsoleAppender" /&gt;
 &lt;/root&gt;
&lt;/log4net&gt;
</code></pre>

but log4net is not working. My project compiles fine, and I get no errors debugging either. The lines where I tell to <code>log.debug("somemessage")</code> gets run fine, but I can't find the <code>mylog.log</code> file, so where is it?

log4net not working

日志文件

嘿，我的web.config中有这样的配置<log4net> <appender name="LogFileAppender" type="log4net.Appender.FileAppender"> <param name="File" value="mylog.log" /> <...

问log4net不工作
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