如何使Serilog从appsettings.json登录到Web输出目录？ [英] How to get Serilog to log to the web output directory from appsettings.json?
问题描述
我使用Visual Studio和集成的Serilog创建了一个新的.NET Core Web项目。它从appsettings.json中读取设置（通过 .UseSerilog（（ctx，config）=> {config.ReadFrom.Configuration（ctx.Configuration）;}））。
I created a new .NET Core web project using Visual Studio and integrated Serilog. It reads settings from the appsettings.json (via .UseSerilog((ctx, config) => { config.ReadFrom.Configuration(ctx.Configuration); })).
在appsettings.json中，写入日志的路径在 Serilog / WriteTo / Args / pathFormat 中指定。如果我将该值设置为 log.txt ，它将尝试将文件写入 c：\program files\iisexpress\log.txt。
In the appsettings.json, the path to write the log is specified at Serilog/WriteTo/Args/pathFormat. If I set that value to log.txt, it will attempt to write the file to `c:\program files\iisexpress\log.txt'.
如何将其写入Web应用程序的内容根目录？
How can I get it to write to the content root of my web app?
推荐答案
理想情况下，您不想要将日志文件写入网站的内容根目录应用程序，因为这些最终可能可以通过Web进行访问，因此这是一个严重的安全考虑。
Ideally, you don't want to write log files to the content root of your web app, since these could end up being accessible over the web, which would be a serious security consideration.
日志文件路径配置可以包含环境变量，因此类似％TMP％\log.txt 或基于％LOCALAPPDATA％等的路径是一个不错的选择（因为只要网站的工作进程有权写入该位置）。
The log file path configuration can include environment variables, so something like %TMP%\log.txt, or a path based on %LOCALAPPDATA% etc. is a good option (as long as the web site's worker process has permission to write to the location).
您可以通过在设置之前更改当前目录来写入相对于Web应用程序的路径记录器：
You can write to a path that's relative to your web app by changing the current directory before setting up the logger:
Environment.CurrentDirectory = AppContext.BaseDirectory;
或者，您可以组合使用这些方法并设置自己的环境变量来做到这一点：
Or, you can combine these approaches and set your own environment variable to do it:
Environment.SetEnvironmentVariable("BASEDIR", AppContext.BaseDirectory);
因此配置如下：
"%BASEDIR%\logs\log.txt"
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