blocks|key|2224790|text|你要找的是NLog+special+folders。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2224791|示例：|2224792|...fileName="${specialfolder:folder=ApplicationData}/Program/file.txt"...|code-block|syntax|javascript|2224793|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/nlog/NLog/wiki/Special-Folder-Layout-Renderer^0|5|K|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

You're looking for the <a href="https://github.com/nlog/NLog/wiki/Special-Folder-Layout-Renderer" rel="noreferrer">NLog special folders</a>.

Example:

<pre><code>...fileName="${specialfolder:folder=ApplicationData}/Program/file.txt"...
</code></pre>

blocks|key|816309|text|奥伦的答案应该是正确的答案。然而，在我的生活中，我无法使用nLog+2.0.0.0在我的.NET+4.0网站上使用它。我最终使用了简单的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|816310|fileName="${basedir}app_data\logs\${shortdate}.log"+|code-block|syntax|javascript|816311|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|$]]

Oren's answer should be the right answer. However, for the life of me I couldn't get it to work with my .NET 4.0 website using nLog 2.0.0.0. I ended up using simply 

<pre><code>fileName="${basedir}app_data\logs\${shortdate}.log" 
</code></pre>

blocks|key|2224838|text|${specialfolder:ApplicationData}也适用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2224839|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|$]]

${specialfolder:ApplicationData} also works

blocks|key|674077|text|以前的答案帮助解决了我遇到的问题，但几年后，解决方案在v4.3下有所不同。目录和文件名与路径组合在一起。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|674078|@theGecko的链接对于语法来说仍然是最新的，但该页面缺少一个示例：|674079|https://github.com/nlog/NLog/wiki/Special-Folder-Layout-Renderer|offset|length|674080|下面的示例将在当前用户应用程序数据漫游目录C:\USers\current.user\AppData\Roaming\My\Path\Somewhere中写入文件myLog.log|style|CODE|674081|fileName="${specialfolder:dir=My/Path/Somewhere/:file=myFile.log:folder=ApplicationData}"|code-block|syntax|javascript|674082|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|1S|0|0|L|1J|29|9|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@$F|10|G|11|1|12]]|A|$]]|$1|H|3|I|5|6|7|13|8|@$F|14|G|15|J|K]|$F|16|G|17|J|K]]|9|@]|A|$]]|$1|L|3|M|5|N|7|18|8|@]|9|@]|A|$O|P]]|$1|Q|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|E]]]]

The previous answers helped solve the problem I was having, but a couple of years later and the solution is now somewhat different under v4.3. The directory and filename are combined with the path.

@theGecko's link is still current for the syntax, but the page is deficient of an example:

<a href="https://github.com/nlog/NLog/wiki/Special-Folder-Layout-Renderer" rel="nofollow">https://github.com/nlog/NLog/wiki/Special-Folder-Layout-Renderer</a>

The following example would write the file <code>myLog.log</code> to the current users application data roaming directory <code>C:\USers\current.user\AppData\Roaming\My\Path\Somewhere</code>:

<pre><code>fileName="${specialfolder:dir=My/Path/Somewhere/:file=myFile.log:folder=ApplicationData}"
</code></pre>

blocks|key|2224952|text|用于登录到项目目录的：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2224953|虽然前面的答案适用于原始问题，但搜索如何登录到项目APP_DATA目录会引出这个问题。虽然bkaid的答案适用于ASP.NET，并特别适用于使用APP_DATA文件夹，但对于.NET核心和.NET+5，解决方案略有不同，因为这个主题已经被放弃，转而支持为那些应该提供服务的内容定义一个wwwroot文件夹，其余的是私有的。因此，对于.NET核心/5，答案是写入解决方案根目录：|CODE|2224954|2224955|首先，确保将NLog.Web.AspNetCore程序集添加到nlog.config：|ordered-list-item|2224956|2224957|然后，|2224958|使用该扩展提供的布局渲染器之一，在本例中为${aspnet-appbasepath}，它引用了解决方案根目录：|2224959|2224960|这会将文件写入<solution+folder>/log/2021-07-01.log，而面向公众的网站永远不会提供该文件。此程序集提供的其他布局呈现器是listed+on+the+NLog+website。|2224961|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/5426511/2386514|1|https://nlog-project.org/config/?tab=layout-renderers&search=package:nlog.web.aspnetcore^0|A|1|0|P|8|20|8|3Y|7|19|5|0|0|0|6|J|V|B|0|0|0|L|L|0|0|7|10|25|Q|1|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|17|8|@$9|18|A|19|B|H]|$9|1A|A|1B|B|H]|$9|1C|A|1D|B|H]]|D|@$9|1E|A|1F|1|1G]]|E|$]]|$1|I|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1I|8|@$9|1J|A|1K|B|H]|$9|1L|A|1M|B|H]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|1O|8|@]|D|@]|E|$]]|$1|P|3|Q|5|L|7|1P|8|@$9|1Q|A|1R|B|H]]|D|@]|E|$]]|$1|R|3|-4|5|6|7|1S|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|1T|8|@$9|1U|A|1V|B|H]]|D|@$9|1W|A|1X|1|1Y]]|E|$]]|$1|U|3|-4|5|6|7|1Z|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]|12|$5|X|Y|Z|E|$10|13]]]]

For logging to the project directory:
While the previous answers work for the original question, searching for how to log to the project <code>APP_DATA</code> directory leads to this question. And while <a href="https://stackoverflow.com/a/5426511/2386514">bkaid</a>'s answer works for ASP.NET and for using the <code>APP_DATA</code> folder specifically, for .NET Core and .NET 5 the solution is a bit different, because that motif has been abandoned in favor of defining a <code>wwwroot</code> folder for only those things which should be served, and the remainder being private. The answer for .NET Core/5, then, is to write to the solution root directory:
<ol>
<li>First, ensure the <code>NLog.Web.AspNetCore</code> assembly is added to <code>nlog.config</code>:
<pre class="lang-xml prettyprint-override"><code>&lt;extensions&gt;
 &lt;add assembly=&quot;NLog.Web.AspNetCore&quot;/&gt;
&lt;/extensions&gt;
</code></pre>
</li>
<li>Then use one of the layout renderers provided by that extension, in this case <code>${aspnet-appbasepath}</code> which references the solution root directory:
<pre class="lang-xml prettyprint-override"><code>&lt;targets&gt;
 &lt;target name=&quot;file&quot;
 type=&quot;File&quot;
 xsi:type=&quot;File&quot;
 fileName=&quot;${aspnet-appbasepath}/log/${shortdate}.log&quot;
 layout=&quot;${longdate}|${event-properties:item=EventId_Id:whenEmpty=0}&quot;/&gt;
&lt;/targets&gt;
</code></pre>
</li>
</ol>
This will write the file to <code>&lt;solution folder&gt;/log/2021-07-01.log</code>, which will never be served by the public-facing website. Other layout renderers provided by this assembly are <a href="https://nlog-project.org/config/?tab=layout-renderers&amp;search=package:nlog.web.aspnetcore" rel="nofollow noreferrer">listed on the NLog website</a>.

My NLog targets is like this:

<pre class="lang-xml prettyprint-override"><code>&lt;targets&gt;
 &lt;target xsi:type="Console" name="console" 
 layout="${longdate}|${level}|${message}" /&gt;
 &lt;target xsi:type="File" name="ErrorLog" fileName="${basedir}/error.txt"
 layout="${longdate}
 Trace: ${stacktrace} 
 ${message}" /&gt;
 &lt;target xsi:type="File" name="AccessLog" fileName="${basedir}/access.txt"
 layout="${shortdate} | ${message}" /&gt;
&lt;/targets&gt;
</code></pre>

But this causes problems if the user isn't an admin on their machine, because they will not have write access to "Program Files". How can I get something like <code>%AppData%</code> to NLog instead of BaseDir?

using AppData location in NLog

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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我的NLog目标是这样的：<targets> <target xsi:type="Console" name="console" layout="${longdate}|${level}|${message}" /> <target xsi:type="File" name="ErrorLog" fileName="${basedir}/error.txt" layo

问在NLog中使用AppData定位
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