C# NLog-MySQL数据库目标发生StackOverflow异常/NLog.NLogRuntimeException

我已将NLog配置为将错误/日志记录到两个MySQL/数据库目标：

<nlog autoReload="false" internalLogFile="omg.txt" throwExceptions="true" xmlns="http://www.nlog-project.org/schemas/NLog.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <!--<nlog autoReload="false" xmlns="http://www.nlog-project.org/schemas/NLog.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">-->
  <variable name="DefaultLayout" value="${longdate} | ${uppercase:${level}} | ${logger} | ${message}&#xD;&#xA;     ${exception:innerFormat=ToString:maxInnerExceptionLevel=6:innerExceptionSeparator=InnerException:format=ToString}" />
  <targets>
    <target xsi:type="ColoredConsole" name="console" layout="${DefaultLayout}" />
    <target xsi:type="Null" name="nulltarget" formatMessage="false" layout="${DefaultLayout}" />
    <target xsi:type="Database"
          name="MySqlErrorTarget"
          dbProvider="MySql.Data.MySqlClient" connectionString="x"
          keepConnection="true">
      <commandText>
        CALL Error_Insert(@Message)
      </commandText>
      <parameter name="@Message" layout="${message}" />
      (...)
    </target>
    <target xsi:type="Database"
          name="MySqlLogTarget"
          dbProvider="MySql.Data.MySqlClient" connectionString="x"
          keepConnection="true">
      <commandText>
        CALL Log_Insert(@Message)
      </commandText>
      <parameter name="@Message" layout="${message}" />
      (...)
    </target>
  </targets>
  <rules>
    <logger name="*" levels="TRACE, DEBUG, INFO" writeTo="MySqlLogTarget"/>
    <logger name="*" levels="WARN, ERROR, FATAL" writeTo="MySqlErrorTarget"/>
    <logger name="*" minlevel="INFO" writeTo="console" />
  </rules>
</nlog>

这是无限的，因此最终会发生堆栈溢出。Visual Studio中报告的异常如下所示：

2016-03-21 15:36:33.0487 Error Error when writing to database MySql.Data.MySqlClient.MySqlException (0x80004005): Unable to connect to any of the specified MySQL hosts. ---> System.Net.Sockets.SocketException (0x80004005): No such host is known
   at System.Net.Dns.GetAddrInfo(String name)
   at System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6)
   at System.Net.Dns.GetHostEntry(String hostNameOrAddress)
   at MySql.Data.Common.MyNetworkStream.CreateStream(MySqlConnectionStringBuilder settings, Boolean unix)
   at MySql.Data.Common.StreamCreator.GetStream(MySqlConnectionStringBuilder settings)
   at MySql.Data.MySqlClient.NativeDriver.Open()
   at MySql.Data.MySqlClient.NativeDriver.Open()
   at MySql.Data.MySqlClient.Driver.Open()
   at MySql.Data.MySqlClient.Driver.Create(MySqlConnectionStringBuilder settings)
   at MySql.Data.MySqlClient.MySqlPool.GetPooledConnection()
   at MySql.Data.MySqlClient.MySqlPool.TryToGetDriver()
   at MySql.Data.MySqlClient.MySqlPool.GetConnection()
   at MySql.Data.MySqlClient.MySqlConnection.Open()
   at NLog.Targets.DatabaseTarget.OpenConnection(String connectionString)
   at NLog.Targets.DatabaseTarget.EnsureConnectionOpen(String connectionString)
   at NLog.Targets.DatabaseTarget.WriteEventToDatabase(LogEventInfo logEvent)
   at NLog.Targets.DatabaseTarget.Write(LogEventInfo logEvent)
2016-03-21 15:37:00.1794 Error Error when writing to database MySql.Data.MySqlClient.MySqlException (0x80004005): Unable to connect to any of the specified MySQL hosts. ---> System.Net.Sockets.SocketException (0x80004005): No such host is known
   at System.Net.Dns.GetAddrInfo(String name)
   at System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6)
   at System.Net.Dns.GetHostEntry(String hostNameOrAddress)
   at MySql.Data.Common.MyNetworkStream.CreateStream(MySqlConnectionStringBuilder settings, Boolean unix)
   at MySql.Data.Common.StreamCreator.GetStream(MySqlConnectionStringBuilder settings)
   at MySql.Data.MySqlClient.NativeDriver.Open()
   at MySql.Data.MySqlClient.NativeDriver.Open()
   at MySql.Data.MySqlClient.Driver.Open()
   at MySql.Data.MySqlClient.Driver.Create(MySqlConnectionStringBuilder settings)
   at MySql.Data.MySqlClient.MySqlPool.GetPooledConnection()
   at MySql.Data.MySqlClient.MySqlPool.TryToGetDriver()
   at MySql.Data.MySqlClient.MySqlPool.GetConnection()
   at MySql.Data.MySqlClient.MySqlConnection.Open()
   at NLog.Targets.DatabaseTarget.OpenConnection(String connectionString)
   at NLog.Targets.DatabaseTarget.EnsureConnectionOpen(String connectionString)
   at NLog.Targets.DatabaseTarget.WriteEventToDatabase(LogEventInfo logEvent)
   at NLog.Targets.DatabaseTarget.Write(LogEventInfo logEvent)

NLog.NLogRuntimeException occurred
  HResult=-2146233088
  Message=Exception occurred in NLog
  Source=NLog
  StackTrace:
       at NLog.LoggerImpl.<>c__DisplayClass1.<Write>b__0(Exception ex)
       at NLog.Internal.SingleCallContinuation.Function(Exception exception)
       at NLog.Targets.Target.Write(AsyncLogEventInfo logEvent)
       at NLog.Targets.Target.WriteAsyncLogEvent(AsyncLogEventInfo logEvent)
       at NLog.LoggerImpl.WriteToTargetWithFilterChain(TargetWithFilterChain targetListHead, LogEventInfo logEvent, AsyncContinuation onException)
       at NLog.LoggerImpl.Write(Type loggerType, TargetWithFilterChain targets, LogEventInfo logEvent, LogFactory factory)
       at NLog.Logger.Debug(String message)
       at Runner.Main(String[] args) in C:\Repos\x\src\Runner.cs:line 36
  InnerException: 
       ErrorCode=-2147467259
       HResult=-2147467259
       Message=Unable to connect to any of the specified MySQL hosts.
       Number=1042
       Source=MySql.Data
       StackTrace:
            at MySql.Data.MySqlClient.NativeDriver.Open()
            at MySql.Data.MySqlClient.Driver.Open()
            at MySql.Data.MySqlClient.Driver.Create(MySqlConnectionStringBuilder settings)
            at MySql.Data.MySqlClient.MySqlPool.GetPooledConnection()
            at MySql.Data.MySqlClient.MySqlPool.TryToGetDriver()
            at MySql.Data.MySqlClient.MySqlPool.GetConnection()
            at MySql.Data.MySqlClient.MySqlConnection.Open()
            at NLog.Targets.DatabaseTarget.OpenConnection(String connectionString)
            at NLog.Targets.DatabaseTarget.EnsureConnectionOpen(String connectionString)
            at NLog.Targets.DatabaseTarget.WriteEventToDatabase(LogEventInfo logEvent)
            at NLog.Targets.DatabaseTarget.Write(LogEventInfo logEvent)
            at NLog.Targets.Target.Write(AsyncLogEventInfo logEvent)
       InnerException: 
            ErrorCode=11001
            HResult=-2147467259
            Message=No such host is known
            NativeErrorCode=11001
            Source=System
            StackTrace:
                 at System.Net.Dns.GetAddrInfo(String name)
                 at System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6)
                 at System.Net.Dns.GetHostEntry(String hostNameOrAddress)
                 at MySql.Data.Common.MyNetworkStream.CreateStream(MySqlConnectionStringBuilder settings, Boolean unix)
                 at MySql.Data.Common.StreamCreator.GetStream(MySqlConnectionStringBuilder settings)
                 at MySql.Data.MySqlClient.NativeDriver.Open()
            InnerException: 

NLog.NLogRuntimeException发生
HResult=-2146233088
消息=NLog中发生异常
震源=NLog
堆栈跟踪：
在NLog.LoggerImpl.c__;u DisplayClass1.b__0处（异常示例）
位于NLog.Internal.SingleCallContinuation.Function（异常）
在NLog.Targets.Target.Write处（AsyncLogEventInfo logEvent）
位于NLog.Targets.Target.WriteAsynClogeEvent（AsyncLogEventInfo logEvent）
在NLog.LoggerImpl.WriteToTargetWithFilterChain（TargetWithFilterChain targetListHead、LogEventInfo logEvent、AsyncContinuation OneException）处
在NLog.LoggerImpl.Write处（输入loggerType、TargetWithFilterChain targets、LogEventInfo、logEvent、LogFactory）
在NLog.Logger.Debug处（字符串消息）
在C:\Repos\x\src\Runner.cs中的Runner.Main（字符串[]args）处：第36行
内部异常：
错误代码=-2147467259
HResult=-2147467259
Message=无法连接到任何指定的MySQL主机。
数字=1042
Source=MySql.Data
堆栈跟踪：
在MySql.Data.MySqlClient.NativeDriver.Open（）上
在MySql.Data.MySqlClient.Driver.Open（）上
位于MySql.Data.MySqlClient.Driver.Create（MySqlConnectionStringBuilder设置）
在MySql.Data.MySqlClient.MySqlPool.GetPooledConnection（）上
在MySql.Data.MySqlClient.MySqlPool.TryToGetDriver（）上
在MySql.Data.MySqlClient.MySqlPool.GetConnection（）上
在MySql.Data.MySqlClient.MySqlConnection.Open（）上
位于NLog.Targets.DatabaseTarget.OpenConnection（字符串连接字符串）
在NLog.Targets.DatabaseTarget.EnsureReconnectionOpen处（字符串连接字符串）
在NLog.Targets.DatabaseTarget.WriteEventToDatabase（LogEventInfo logEvent）中
在NLog.Targets.DatabaseTarget.Write处（LogEventInfo logEvent）
在NLog.Targets.Target.Write处（AsyncLogEventInfo logEvent）
内部异常：
错误代码=11001
HResult=-2147467259
Message=不知道这样的主机
NativeErrorCode=11001
来源=系统
堆栈跟踪：
位于System.Net.Dns.GetAddrInfo（字符串名称）
位于System.Net.Dns.InternalGetHostByName（字符串主机名，布尔值includeIPv6）
位于System.Net.Dns.GetHostEntry（字符串HostName或Address）
位于MySql.Data.Common.MyNetworkStream.CreateStream（MySqlConnectionStringBuilder设置，布尔unix）
位于MySql.Data.Common.StreamCreator.GetStream（MySqlConnectionStringBuilder设置）
在MySql.Data.MySqlClient.NativeDriver.Open（）上
内部异常：

我尝试将规则更改为：

  <rules>
    <logger name="NLog.*" minlevel="TRACE" writeTo="nulltarget" final="true"/>
    <logger name="MySql.*" minlevel="TRACE" writeTo="nulltarget" final="true"/>
    <logger name="System.*" minlevel="TRACE" writeTo="nulltarget" final="true"/>
    <logger name="*" levels="TRACE, DEBUG, INFO" writeTo="MySqlLogTarget"/>
    <logger name="*" levels="WARN, ERROR, FATAL" writeTo="MySqlErrorTarget"/>
    <logger name="*" minlevel="INFO" writeTo="console" />
  </rules>

---

然而，这没有帮助。有什么办法可以避免StackOverflowException吗？

在

上设置
throweExceptions
，结果是在我的代码库中的某个地方调用了这一行：

Trace.Listeners.Add(new NLogTraceListener());

这导致来自MySql的错误日志被重定向到跟踪，多亏了NLogTraceListener，它由NLog使用MySql目标记录，但失败并被重定向到跟踪，多亏了NLogTraceListener，它由NLog使用MySql目标记录，这。。。你知道这是怎么回事

我没有想出一个好的解决方案，因为没有足够的信息来过滤TraceListener中的日志（只是作为字符串的消息）。因此，我暂时关闭了NLogTraceListener，因为打开它并不重要。
然后会发生堆栈溢出。我将尝试隔离此问题并创建一个简单的控制台应用程序。您可以使用loggername（
${logger}
）/callsite（
${callsite}
）过滤这些问题