Exception log4net过滤异常消息？

如何根据记录的异常消息筛选日志记录

代码如下所示：

try { 
    someService.DoSomeWorkflow(); 
} catch(Exception e) {
    log.Error("Hey I have an error", e);
}

<appender name="EventLogger" type="log4net.Appender.EventLogAppender">
    <applicationName value="foo" />
    <layout type="log4net.Layout.PatternLayout" value="PID:%P{pid}: %message" />
    <filter type="log4net.Filter.StringMatchFilter">
        <stringToMatch value="TextInsideTheException" />
    </filter>
</appender>

配置如下所示：

try { 
    someService.DoSomeWorkflow(); 
} catch(Exception e) {
    log.Error("Hey I have an error", e);
}

<appender name="EventLogger" type="log4net.Appender.EventLogAppender">
    <applicationName value="foo" />
    <layout type="log4net.Layout.PatternLayout" value="PID:%P{pid}: %message" />
    <filter type="log4net.Filter.StringMatchFilter">
        <stringToMatch value="TextInsideTheException" />
    </filter>
</appender>

我发现我只能过滤记录的消息（“嘿，我有一个错误”），但它似乎忽略了异常的消息。因为这是在我们的生产环境中，所以我不能进行任何代码更改，所以我不能更改记录的消息。是否有一些配置会指定同时检查异常消息？

请尝试以下操作：

log.Error("Hey I have an error: " + e.Message);

---

编辑：很抱歉，没有看到您无法更改该行…

通过子类化，您可以实现一个用于计算异常文本的筛选器。或者是例外类型

以下是基于Peter公认答案的基本实现

using System;
using log4net.Core;

namespace log4net.Filter
{
    public abstract class ExceptionFilterBase : FilterSkeleton
    {
        public override FilterDecision Decide(LoggingEvent loggingEvent)
        {
            if (loggingEvent == null)
                throw new ArgumentNullException("loggingEvent");

            var str = GetString(loggingEvent);
            if (StringToMatch == null || string.IsNullOrEmpty(str) || !str.Contains(StringToMatch))
                return FilterDecision.Neutral;
            return AcceptOnMatch ? FilterDecision.Accept : FilterDecision.Deny;
        }

        protected abstract string GetString(LoggingEvent loggingEvent);

        public string StringToMatch { get; set; }

        public bool AcceptOnMatch { get; set; }
    }

    public class ExceptionMessageFilter : ExceptionFilterBase
    {
        protected override string GetString(LoggingEvent loggingEvent)
        {
            return loggingEvent.ExceptionObject == null
                ? null : loggingEvent.ExceptionObject.Message;
        }
    }

    public class ExceptionTypeFilter : ExceptionFilterBase
    {
        protected override string GetString(LoggingEvent loggingEvent)
        {
            return loggingEvent.ExceptionObject == null
                ? null : loggingEvent.ExceptionObject.GetType().FullName;
        }
    }

    public class ExceptionStackFilter : ExceptionFilterBase
    {
        protected override string GetString(LoggingEvent loggingEvent)
        {
            return loggingEvent.ExceptionObject == null
                ? null : loggingEvent.ExceptionObject.StackTrace;
        }
    }
}

配置文件

<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
  <file value="Client.log" />
  <layout type="log4net.Layout.PatternLayout">
   <conversionPattern value="%date{yyyy/MM/dd HH:mm:ss,fff} [%-5level] %logger - %message%newline" />
  </layout>
  <filter type="log4net.Filter.StringMatchFilter">
    <stringToMatch value="Token is not valid." />
    <acceptOnMatch value="false" />
  </filter>
  <filter type="log4net.Filter.ExceptionMessageFilter, YourAssembly">
    <stringToMatch value="Application is not installed." />
    <acceptOnMatch value="false" />
  </filter>
  <filter type="log4net.Filter.ExceptionTypeFilter, YourAssembly">
    <stringToMatch value="System.Deployment.Application.DeploymentException" />
    <acceptOnMatch value="false" />
  </filter>
  <filter type="log4net.Filter.ExceptionStackFilter, YourAssembly">
    <stringToMatch value="at System.Deployment.Application.ComponentStore.GetPropertyString(DefinitionAppId appId, String propName)" />
    <acceptOnMatch value="false" />
  </filter>
</appender>