在 asp.net 核心应用程序中配置 log4net AdoNetAppender

Question

我正在尝试使用 MicroKnights AdoNetAppender（nuget 第 3 方库）为我的 asp.net 核心应用程序配置 log4net。但是，数据库中没有任何记录。运行应用程序时我也没有收到任何错误。我怀疑 connectionType 导致了问题。

log4net 配置文件：

    <log4net>
  <appender name="AdoNetAppender" type="MicroKnights.Logging.AdoNetAppender, MicroKnights.Log4NetAdoNetAppender">
    <bufferSize value="1" />
    <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=4.4.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
    <connectionStringName value="log4net" />
    <connectionStringFile value="appsettings.json" />
    <commandText value="INSERT INTO Log ([Date],[Thread],[Level],[Logger],[Message],[Exception]) VALUES (@log_date, @thread, @log_level, @logger, @message, @exception)" />
    <parameter>
      <parameterName value="@log_date" />
      <dbType value="DateTime" />
      <layout type="log4net.Layout.RawTimeStampLayout" />
    </parameter>
    <parameter>
      <parameterName value="@thread" />
      <dbType value="String" />
      <size value="255" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%thread" />
      </layout>
    </parameter>
    <parameter>
      <parameterName value="@log_level" />
      <dbType value="String" />
      <size value="50" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%level" />
      </layout>
    </parameter>
    <parameter>
      <parameterName value="@logger" />
      <dbType value="String" />
      <size value="255" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%logger" />
      </layout>
    </parameter>
    <parameter>
      <parameterName value="@message" />
      <dbType value="String" />
      <size value="4000" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%message" />
      </layout>
    </parameter>
    <parameter>
      <parameterName value="@exception" />
      <dbType value="String" />
      <size value="2000" />
      <layout type="log4net.Layout.ExceptionLayout" />
    </parameter>
  </appender>
  <root>
    <level value="ALL" />
    <appender-ref ref="AdoNetAppender" />
  </root>
</log4net>

appsettings.json:

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AllowedHosts": "*",
  "connectionStrings": {
    "log4net": "Server=[[ServerName]]; Database=[[DatabaseName]]; Trusted_Connection=True; MultipleActiveResultSets=true"
  }
}

program.cs

中的主要方法

 public static void Main(string[] args)
        {
            var logRepository = LogManager.GetRepository(Assembly.GetEntryAssembly());
            XmlConfigurator.Configure(logRepository, new FileInfo("log4net.config"));

            ILog log = log4net.LogManager.GetLogger("Logger");

            log.Info("logging to database");

            CreateWebHostBuilder(args).Build().Run();
        }

如有任何帮助，我们将不胜感激。

Answer 1

尝试将调试属性添加到 log4net 根元素。

<log4net debug="true">

这将允许您在运行应用程序时查看调试输出。我用你提供的例子做了这个，它报告了连接类型的错误。错误是

log4net: Setting Collection Property [AddParameter] to object [MicroKnights.Logging.AdoNetAppenderParameter]
log4net:ERROR [AdoNetAppender] ErrorCode: GenericFailure. Failed to load connection type [System.Data.SqlClient.SqlConnection, System.Data, Version=4.4.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]
System.IO.FileLoadException: Could not load file or assembly 'System.Data, Version=4.4.0.65535, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
File name: 'System.Data, Version=4.4.0.65535, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
   at System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMarkHandle stackMark, IntPtr pPrivHostBinder, Boolean loadTypeFromPartialName, ObjectHandleOnStack type, ObjectHandleOnStack keepalive)
   at System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean loadTypeFromPartialName)
   at System.RuntimeType.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark)
   at System.Type.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase)
   at log4net.Util.SystemInfo.GetTypeFromString(Assembly relativeAssembly, String typeName, Boolean throwOnError, Boolean ignoreCase)
   at MicroKnights.Logging.AdoNetAppender.ResolveConnectionType()

我怀疑你是否改变了这一行

<connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=4.4.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />

至

<connectionType value="System.Data.SqlClient.SqlConnection, System.Data" />

它会起作用的。 1.0.2 版本的 MicroKnights 进行了更改，以使用可用的 System.Data.SqlClient 版本。

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