使用外部配置文件时，log4net无法记录日志

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问题描述

我发现了其他类似问题的帖子，但是到目前为止，我还无法解决我的特殊情况.

I have found other posts with similar problems, but thus far I haven't been able to solve my particular case.

如果我将log4net配置放在app.config中，则一切正常，但是我希望将其保存在单独的文件中.

If I put the log4net configuration in the app.config then all works fine, but I want it in a separate file.

我查看了以下链接，并尝试实现一些建议的解决方案(但也许我没有正确理解):

I have looked at the following links, and have tried to implement some of the proposed solutions (but perhaps I didn't understand it correctly):

类似的问题，但适用于Web场景

Apache文档，直接读取文件"部分

Tim Corey的log4net教程

这是我的Log4NetSettings.config文件的内容(包装在配置元素中):

So here is my Log4NetSettings.config file's content (wrapped in a configuration element):

<log4net>
<appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
  <bufferSize value="1" />
  <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
  <connectionString value="" />
  <commandText value="INSERT INTO [Calculation Engine 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="INFO"/>
  <appender-ref ref="AdoNetAppender"/>
</root>
</log4net>

我在运行时更改了连接字符串的值.

I change the connectionstring value during runtime.

这是我在app.config中拥有的:

Here is what I have in the app.config:

<configSections>
 <section name="log4net"  type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
<appSettings>
 <add key="log4net.Config" value="Log4NetSettings.config" />
</appSettings>
<log4net configSource="Log4NetSettings.config" />

在可执行类中，我有这个:

In the executable class I have this:

[assembly: log4net.Config.XmlConfigurator(ConfigFile = "Log4NetSettings.config", Watch = true)]

，然后只要我掌握了连接字符串并将其配置为AdoNetAppender，我就会致电:

and then as soon as I can get hold of the connectionstring and configure it to the AdoNetAppender, I call:

 log.Info("Testing");

我也有:

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

在具有Assembly属性和第一次日志记录调用的类中.

in the class with the assembly attribute and first logging call.

Log4NetSettings.config文件的构建操作"设置为内容"，复制到输出目录"设置为始终复制".

The Log4NetSettings.config file has its Build Action set to Content and its 'Copy to Output Directory' set to 'Copy Always'.

我一直在拔头发，我不知道自己在做什么错.我应该将Log4NetSettings.config当作普通的xml文件吗?我应该将Assembly属性放在AssemblyInfo.cs文件中吗?我应该打电话给吗?

I have been pulling my hair out, and I don't know what I am doing wrong.Should I have Log4NetSettings.config as just a normal xml file?Should I put the assembly attribute in the AssemblyInfo.cs file?Should I rather call:

XmlConfigurator.ConfigureAndWatch(new System.IO.FileInfo(AppDomain.CurrentDomain.BaseDirectory + "Log4NetSettings.config"));

有没有Assembly属性?

than have the assembly attribute?

感觉就像我尝试了很多不同的事情，也许我把它们混在一起并弄错了组合.

It feels like I've tried so many different things, that perhaps I have mixed them up and gotten the wrong combination.

推荐答案

是的，您应该在XML文件中包含log4net配置.当log4net位于单独的文件中时，它不再与app.config相关，因此不需要配置部分，并且不应将config包装在配置元素中. (没有必要在AssemblyInfo.cs中具有assembly属性，并且我注意到您已经在启动代码()

Yes, you should have the log4net config in an XML file. When you have log4net in a separate file, it's no longer related to the app.config so the configuration section is not required, and the config should not be wrapped in a configuration element. (It isn't necessary to have the assembly attribute in the AssemblyInfo.cs, and I note you have initialised the logging system in your startup code, which is required when using the assembly attribute technique)

因此，您的log4net文件将如下所示:

Thus your log4net file will look like this:

<?xml version="1.0" encoding="utf-8" ?>
<log4net>
    <!-- config .. -->

如果仍然有问题，则log4net具有诊断和调试功能，请参阅此问题启用它.

If you still have problems, log4net has diagnostic and debugging capability, see this question for how to enable it.

(此外，如果您使用的是log4net 1.2.11或更高版本，则可以在log4net配置中设置连接字符串名称(假设它在您的app.config中)

(Also, if you're using log4net 1.2.11 or later, you can set the connection string name in the log4net config, assuming it is in your app.config)

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