NLogを使用したPostgreSQLDBへの.NETCoreロギング

これは私がファイルとPostgreSQLに書き込むのに役立ちました：

1. 最初に、ASP.NET Core Webアプリケーション（.NET Core）を作成しました。

2. 次に、NuGetからインストールしました：

   • Npgsql 3.2.1
   • NLog.Web.AspNetCore 4.3.1

3. 次のファイルを次のように変更しました：

   a） project.json

   "buildOptions": {
       "emitEntryPoint": true,
       "preserveCompilationContext": true,
       "copyToOutput": {
           "includeFiles": [ "nlog.config" ]
       }
   },
   "publishOptions": {
       "include": [
           "wwwroot",
           "web.config",
           "nlog.config"
       ]
   }
   

   
   

   b） Startup.cs

   public class Startup
   {
       public Startup(IHostingEnvironment env)
       {
           env.ConfigureNLog("nlog.config");
       }
   
       public void ConfigureServices(IServiceCollection services)
       {
           services.AddMvc();
       }
   
       public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
       {
           loggerFactory.AddNLog();
           app.UseDeveloperExceptionPage();
           app.UseMvc();
           app.AddNLogWeb();
       }
   }
   

   
   

   c） nlog.config

   <?xml version="1.0" encoding="utf-8" ?>
   <nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         autoReload="true"
         internalLogLevel="Warn"
         internalLogFile="c:\temp\internal-nlog.txt">
   
     <!-- Load the ASP.NET Core plugin -->
     <extensions>
       <add assembly="NLog.Web.AspNetCore"/>
     </extensions>
   
     <!-- the targets to write to -->
     <targets>
       <target xsi:type="File" name="localFile" fileName="c:\\temp\\nlog-all-${shortdate}.log"
                layout="${longdate} ${level} ${message} ${logger} ${callsite} ${exception:format=tostring}" />
   
       <target name="database" xsi:type="Database">
         <dbProvider>Npgsql.NpgsqlConnection, Npgsql, Version=3.2.1.0, Culture=neutral, PublicKeyToken=5d8b90d52f46fda7</dbProvider>
         <connectionString>Server=localhost;Port=5432;User Id=XXX;Password=XXX;Database=TestLog;</connectionString>
         <commandText>
           insert into "logs" ("Application", "Timestamp", "Level", "Message", "Logger", "CallSite", "Exception")
           values (:Application, :Timestamp, :Level, :Message, :Logger, :Callsite, :Exception);
         </commandText>
         <parameter name="@Application" layout="TestApp" />
         <parameter name="@Timestamp" layout="${longdate}" />
         <parameter name="@Level" layout="${level}" />
         <parameter name="@Message" layout="${message}" />
         <parameter name="@Logger" layout="${logger}" />
         <parameter name="@Callsite" layout="${callsite}" />
         <parameter name="@Exception" layout="${exception:format=tostring}" />
       </target>
   
       <!-- write to the void aka just remove -->
       <target xsi:type="Null" name="blackhole" />
     </targets>
   
     <!-- rules to map from logger name to target -->
     <rules>
       <!--All logs, including from Microsoft-->
       <logger name="*" minlevel="Debug" writeTo="database" />
       <logger name="*" minlevel="Debug" writeTo="localFile" />
   
       <!--Skip Microsoft logs and so log only own logs-->
       <logger name="Microsoft.*" minlevel="Trace" writeTo="blackhole" final="true" />
     </rules>
   </nlog>
   

   
   

   d）コントローラー

   public class HomeController : Controller
   {
       ILogger<HomeController> _logger;
   
       public HomeController(ILogger<HomeController> logger)
       {
           _logger = logger;
       }
   
       [Route("home/test")]
       public IActionResult Test()
       {
           _logger.LogInformation("Logged test information from home controller.");
   
           return Ok("Ok");
       }
   }
   

参考資料：
[1]。 はじめにASP.NET Core（project.json）