如何根据记录的异常消息过滤日志记录?
代码如下所示:
try {
someService.DoSomeWorkflow();
} catch(Exception e) {
log.Error("Hey I have an error", e);
}
Config看起来像这样:
<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>
我发现我只能过滤掉已记录的消息(“嘿,我有一个错误”),但它似乎忽略了异常的消息。由于这是在我们的生产环境中,我不能进行任何代码更改,因此我无法更改记录的消息。是否有一些配置指定也检查异常的消息?
答案 0 :(得分:2)
通过子类化FilterSkeleton,您可以实现一个评估异常文本的过滤器。或者那个例外类型。
答案 1 :(得分:0)
试试这个:
log.Error("Hey I have an error: " + e.Message);
编辑:对不起,没看到你无法改变那条线......
答案 2 :(得分:0)
以下是基于Peter接受的答案的基本实现
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>