log4net未记录到数据库 [英] log4net not logging to the database

问题描述

我有一个奇怪的问题，我的log4net设置没有将任何数据记录到数据库，也没有引发任何异常来通知问题.我已经在名为"Log4net.Config"的单独文件中定义了配置设置，并且在程序集中引用了它.(请注意，我通过nuget lib安装了Log4net lib)

I have a weird issue, my log4net setup isn't logging any data to the database nor it is raising any exceptions to notify the issue. I have defined the configuration settings in a separate file called "Log4net.Config" and have referenced it in the assembly. (Please Note, I installed the Log4net lib via nuget lib)

[assembly: log4net.Config.XmlConfigurator(ConfigFile = "Log4Net.config", Watch = true)]

这是日志文件.

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>
  <log4net>
    <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
      <bufferSize value="1" />
      <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
      <connectionString value="Data Source=(local);Initial Catalog=testdb;Integrated Security=True" />
      <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>
  </log4net>
</configuration>

我正在像访问它:

 log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

 System.Console.ReadLine();
 log.Debug("This is a debug object");                
 log.Error("ex", new Exception("dfdf"));

您看到任何问题吗?

推荐答案

log4net在设计上不会引发异常，其理由是即使日志记录配置错误，应用程序仍应运行.

log4net does not raise exceptions by design, the rationale is that an application should still run even if the logging configuration is wrong.

独立的log4net配置文件应仅包含log4net配置部分，因此您的log4net.config文件以以下内容开头:

A standalone log4net configuration file should only contain the log4net configuration section, so your log4net.config file starts with this:

<?xml version="1.0" standalone="yes"?>
<log4net>
  <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
    <bufferSize value="1" /> …

此外，您已经定义了附加程序，但尚未定义记录器，因此需要在log4net.config中添加如下内容:

Also, you've defined appenders, but you haven't defined a logger, so you need to add something like this to log4net.config:

<root>
  <level value="DEBUG" />
  <appender-ref ref="AdoNetAppender" />
</root>

(root logger是默认的logger，您可以设置最低日志级别和要使用的附加程序)

(The root logger is the default logger, you set the minimum log level and the appenders you want to use)

如果修复文件后仍然遇到问题，请在log4net.config文件中将log4net设置为调试模式，并将TraceListener部分添加到app.config(或web.config，具体取决于项目类型):

If you still have problems after fixing the file, set log4net into debug mode in the log4net.config file, and add a TraceListener section to your app.config (or web.config depending on project type):

<log4net debug="true">
      <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender"> …

在app.config中:

in app.config:

<system.diagnostics>
    <trace autoflush="true">
      <listeners>
        <add
            name="textWriterTraceListener"
            type="System.Diagnostics.TextWriterTraceListener"
            initializeData="c:\temp\log4net.txt" />
      </listeners>
    </trace>
  </system.diagnostics>

log4net初始化时，它将调试信息写入指定的文件.

When log4net initialises, it will write debugging information to the specified file.

请注意，由于您使用了装配属性来初始化日志记录，因此您需要添加在程序启动期间进行GetLogger调用:

Note that as you have used an assembly attribute to initialise logging, you might need to add a GetLogger call during your program startup:

使用属性可以是一种更清晰的方法来定义应用程序的配置将从中加载.但是值得注意属性纯粹是被动的.它们仅是信息.因此，如果使用配置属性，则必须调用log4net以允许其读取属性.一个简单的调用LogManager.GetLogger将导致调用程序集上的属性进行读取和处理.因此必须进行日志记录在应用程序启动期间尽早调用，以及.

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