c# - 如何堆叠日志消息并在发生异常时记录它们？

Question

我有一个执行大量 SQL 命令的业务流程。我想将这些sql命令“堆叠”在一个堆栈中，并在发生异常时将它们写入DB，让我用一些代码来解释它

public void BusinessMethod()
{
    Log.Initialize(); // Clear the stack
    try
    {  
        Method1ThatExecutesSomeSQLs();
        Method2ThatExecutesSomeSQLs();
        Method3ThatExecutesSomeSQLs();
    }
    catch(Expection ex)
    {
        // if some exception occured in any Method above, them i write the log, otherwise, i dont want to log anything
        Log.Write();
    }
} 

//Example of some Method that executes SQL's
public void Method1ThatExecutesSomeSQLs()
{
    string sql = "select * from table";
    ExecuteSQL(sql);
    Log.StackUp("The following sql command was executed: " + sql); //Just stack up, dont write!
}

有谁知道 Log4Net 或 NLog 是否支持这种情况？如果没有，如何实现？

Answer 1

NLog 4.5 支持开箱即用的场景。这将在警告/错误/致命发生时显示最后 50 条消息(导致自动刷新触发):

<target name="consoleWarn" xsi:type="AutoFlushWrapper" condition="level >= LogLevel.Warn" >
        <target xsi:type="BufferingWrapper" overflowAction="Discard" bufferSize="50">
             <target xsi:type="Console" layout="${level}:${message}" />
        </target>
</target>

NLog 4.4(及更早版本)需要更多帮助，因为 BufferingWrapper 没有 overflowAction。相反，AsyncWrapper 可能会被滥用:

<target name="consoleWarn" xsi:type="AutoFlushWrapper" condition="level >= LogLevel.Warn" >
        <target xsi:type="BufferingWrapper" bufferSize="500">
             <target xsi:type="AsyncWrapper" queueLimit="50" overflowAction="Discard" fullBatchSizeWriteLimit="1" timeToSleepBetweenBatches="2000000000">
                <target xsi:type="Console" layout="${level}:${message}" />
             </target>
        </target>
</target>

另见 https://github.com/NLog/NLog.Extensions.Logging/issues/127