blocks|key|1633769|text|我不知道log4net是否支持这一点，但您可以实现自己的跟踪侦听器来实现这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1633770|TraceListener没有太多需要实现的方法，您所要做的就是将值转发给log4net，因此这应该很容易实现。|1633771|要添加自定义跟踪侦听器，您可以修改app.config/web.config，也可以使用Trace.Listeners.Add(new+Log4NetTraceListener());在代码中添加它|offset|length|style|CODE|1633772|entityMap^0|0|0|18|1C|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@$F|O|G|P|H|I]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

I don't know if log4net supports this, but you could implement your own trace listener that did this.

The TraceListener doesn't have too many method that needs to be implemented and all you would do is to forward the values to log4net so this should be easy to do.

To add a custom trace listener you would either modify your app.config/web.config or you would add it in code using <code>Trace.Listeners.Add(new Log4NetTraceListener());</code>

blocks|key|1633831|text|根据鲁恩的建议，我实现了一个输出到log4net的基本TraceListener：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1633832|public+class+Log4netTraceListener+:+System.Diagnostics.TraceListener
{
++++private+readonly+log4net.ILog+_log;

++++public+Log4netTraceListener()
++++{
++++++++_log+=+log4net.LogManager.GetLogger("System.Diagnostics.Redirection");
++++}

++++public+Log4netTraceListener(log4net.ILog+log)
++++{
++++++++_log+=+log;
++++}

++++public+override+void+Write(string+message)
++++{
++++++++if+(_log+!=+null)
++++++++{
++++++++++++_log.Debug(message);
++++++++}
++++}

++++public+override+void+WriteLine(string+message)
++++{
++++++++if+(_log+!=+null)
++++++++{
++++++++++++_log.Debug(message);
++++++++}
++++}
}|code-block|syntax|javascript|1633833|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|$]]

According to Rune's suggestion I implemented a basic TraceListener which output to log4net:

<pre><code>public class Log4netTraceListener : System.Diagnostics.TraceListener
{
 private readonly log4net.ILog _log;

 public Log4netTraceListener()
 {
 _log = log4net.LogManager.GetLogger("System.Diagnostics.Redirection");
 }

 public Log4netTraceListener(log4net.ILog log)
 {
 _log = log;
 }

 public override void Write(string message)
 {
 if (_log != null)
 {
 _log.Debug(message);
 }
 }

 public override void WriteLine(string message)
 {
 if (_log != null)
 {
 _log.Debug(message);
 }
 }
}
</code></pre>

blocks|key|1633929|text|根据上面的答案，这里有一个实现(这个链接不完整，但我确实找到了源代码)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1633930|https://code.google.com/archive/p/cavity/|offset|length|1633931|为了粗略地处理从LogLog类发出的内部log4net跟踪的问题(在上一个答案的注释中描述)，我通过检查堆栈帧(此实现已经完成)并忽略这些跟踪消息来检查该类是否为跟踪的源：|1633932|++++public+override+void+WriteLine(object+o,+string+category)
++++{
++++++++//+hack+to+prevent+log4nets+own+diagnostic+trace+getting+fed+back
++++++++var+method+=+GetTracingStackFrame(new+StackTrace()).GetMethod();
++++++++var+declaringType+=+method.DeclaringType;
++++++++if+(declaringType+==+typeof(LogLog))
++++++++{
++++++++++++return;
++++++++}
++++++++/*+rest+of+method+writes+to+log4net+*/
++++}|code-block|syntax|javascript|1633933|使用TraceAppender仍然会产生上述注释中描述的问题。|1633934|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|15|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@$D|X|E|Y|1|Z]]|A|$]]|$1|F|3|G|5|6|7|10|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|11|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|12|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|C]]]]

As per the answers above, there's an implementation here (this link is flaky, but I did find the source code): 

<a href="https://code.google.com/archive/p/cavity/" rel="nofollow">https://code.google.com/archive/p/cavity/</a>

To crudely deal with the issue (described in the comments to a previous answer) of internal log4net trace issuing from the LogLog class, I checked for this class being the source of the trace by inspecting the stack frame (which this implementation did already) and ignoring those trace messages:

<pre><code> public override void WriteLine(object o, string category)
 {
 // hack to prevent log4nets own diagnostic trace getting fed back
 var method = GetTracingStackFrame(new StackTrace()).GetMethod();
 var declaringType = method.DeclaringType;
 if (declaringType == typeof(LogLog))
 {
 return;
 }
 /* rest of method writes to log4net */
 }
</code></pre>

Using a TraceAppender will still create the problems described in the comments above.

blocks|key|1419186|text|谢谢,|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1419187|我接受了德克的回答，把他的回答缩小了一点。|1419188|public+class+Log4netTraceListener+:+System.Diagnostics.TraceListener
{
++++private+readonly+log4net.ILog+_log;

++++public+Log4netTraceListener()
++++++++:+this(log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType))
++++{

++++}

++++public+Log4netTraceListener(log4net.ILog+log)
++++{
++++++++_log+=+log;
++++}

++++public+override+void+Write(string+message)+=>+_log?.Debug(message);

++++public+override+void+WriteLine(string+message)+=>+_log?.Debug(message);
}|code-block|syntax|javascript|1419189|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Thanks,

I went with Dirk's answer slimmed down a bit. 

<pre><code>public class Log4netTraceListener : System.Diagnostics.TraceListener
{
 private readonly log4net.ILog _log;

 public Log4netTraceListener()
 : this(log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType))
 {

 }

 public Log4netTraceListener(log4net.ILog log)
 {
 _log = log;
 }

 public override void Write(string message) =&gt; _log?.Debug(message);

 public override void WriteLine(string message) =&gt; _log?.Debug(message);
}
</code></pre>

I'm using log4net to log write log message to a rolling log file. 

Now I would also redirect all trace messages from <code>System.Diagnostics.Trace</code> to that log file. How can I configure that? I tried to find anything about that in the log4net documentation, but without success. Is it possible at all?

The reason I want to do that is because I am interested in the Trace messages of a 3rd party library.

<pre class="lang-xml prettyprint-override"><code>&lt;log4net&gt;
 &lt;appender name="R1" type="log4net.Appender.RollingFileAppender"&gt;
 &lt;file value="C:\Logs\MyService.log" /&gt;
 &lt;appendToFile value="true" /&gt;
 &lt;rollingStyle value="Date" /&gt;
 &lt;maxSizeRollBackups value="10" /&gt;
 &lt;datePattern value="yyyyMMdd" /&gt;
 &lt;layout type="log4net.Layout.PatternLayout"&gt;
 &lt;conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" /&gt;
 &lt;/layout&gt;
 &lt;/appender&gt;
&lt;/log4net&gt;
</code></pre>

How to log Trace messages with log4net?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我使用log4net将写日志消息记录到滚动日志文件中。现在，我还会将所有跟踪消息从System.Diagnostics.Trace重定向到该日志文件。我该如何配置它？我试图在log4net文档中找到任何关于这方面的信息，但是没有成功。这是完全可能的吗？我想这样做的原因是因为我对第三方库的跟踪消息感兴趣。<log4net...

问如何使用log4net记录跟踪消息？
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