为log4net设置动态连接字符串

Question

我正在使用log4net，并且有一个连接字符串我想在我的log4net配置中引用，因为"/Config/connectionStrings.config"中的connectionString将是来自用户的动态输入。

这是我的尝试：

 <log4net xmlns="log4net">
    <root>
     <level value="ERROR" />
     <appender-ref ref="DatabaseAppender" />
   </root>

<appender name="DatabaseAppender" type="log4net.Appender.AdoNetAppender">
  <bufferSize value="100" />
  <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
  <connectionStrings configSource="Config\ConnectionStrings.config" />
  <commandText value="INSERT INTO dm.ErrorLogs ([Date],[Thread],[Level],[Logger],[Message],[Exception]) VALUES (@log_date, @thread, @log_level, @logger, @message, @exception)" />
  <parameter>....
 </appender>
 </log4net>

Log4net期望在connectionStrings中有类似于以下内容的设置：

<connectionString value="data source=SQLSVR;initial catalog=test_log4net;integrated security=false;persist security info=True;User ID=sa;Password=sa" />

我的参考配置： Config\ConnectionStrings.config 所有的内容都是由用户输入的，所以我需要获取第二个connectionString属性的connectionString值，即

"Data Source=(local);Initial Catalog=DbTwo;Integrated Security=True;MultipleActiveResultSets=True;Application Name=AppName2"。

有没有一种方法可以使用ASP.NET C#获取这个值，以便我可以在代码中创建一个数据库appender？或者在log4net.config中还有其他方法吗？

   <connectionStrings>
   <add name="Connection1" 
    connectionString="Data Source=(local);Initial Catalog=DbOne;Integrated Security=True;Application Name=AppName1" 
     providerName="System.Data.SqlClient" />
   <add name="Connection2" 
     connectionString="Data Source=(local);Initial Catalog=DbTwo;Integrated Security=True;MultipleActiveResultSets=True;Application Name=AppName2" 
     providerName="System.Data.SqlClient" />

- Rayshawn

Answer 1

代码长这样：

 //connectionString is the Web.config's connectionString, which I wanted to share.
 public static void SetUpDbConnection(string connectionString, string logConfig)
    {
        //update connection string for log4net dynamically
        var hier = LogManager.GetRepository() as Hierarchy;
        log4net.Config.XmlConfigurator.ConfigureAndWatch(new FileInfo(logConfig));
        if (hier != null)
        {
            var adoNetAppenders = hier.GetAppenders().OfType<AdoNetAppender>();
            foreach (var adoNetAppender in adoNetAppenders)
            {
                adoNetAppender.ConnectionString = connectionString;
                adoNetAppender.ActivateOptions();
            }
        }
    }

- Rayshawn

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链接已损坏，请修复。 - Trikaldarshiii