我有一个服务应用程序，它在启动时读取XML文件并为XML文件中的每个条目启动一个线程。每个线程都会创建一个worker类的实例，该实例需要记录器将任何输出记录到特定于线程的日志文件中。
在服务app.config中，我将log4net配置设置设置为使用XML appender，文件被指定为PatternString，如下所示：
<appender name="XmlAppender" type="log4net.Appender.FileAppender">
<file type="log4net.Util.PatternString" value="D:\Temp\Logs\%property{LogName}.log" />
<immediateFlush value="true"/>
<appendToFile value="true" />
<layout type="log4net.Layout.SimpleLayout" />
</appender>
在创建的worker类的每个实例的线程锁定方法中，我使用log4net.LogManager.GetLogger("MyLogger")方法获取记录器，然后使用ThreadContext.Properties["LogName"] = "Log name prefix"设置当前线程PatternStrings LogName属性。
所有文件都已创建，但是当调用记录器时，它只会将所有消息记录到一个看似随机的文件中。
我已经搜索了很长一段时间，试图找到一个解决方案或一些我做错的答案，但我没有运气。
有谁知道为什么会这样？
答案 0 :(得分：12)
我想我已经解决了这个问题。步骤如下：
作为回报，我得到一个新配置的记录器，指向该线程的相应文件。
XML配置与最初的配置相同，并在此处显示为完整性：
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
<log4net>
<logger name="ProductionLogger">
<appender-ref ref="XmlAppender"/>
<level value="ALL"/>
</logger>
<appender name="XmlAppender" type="log4net.Appender.FileAppender">
<file type="log4net.Util.PatternString" value="D:\Temp\Logs\%property{LogName}.log" />
<immediateFlush value="true"/>
<appendToFile value="true" />
<layout type="log4net.Layout.SimpleLayout" />
</appender>
</log4net>
</configuration>
创建记录器的代码如下。每次运行此代码时，它都在自己的线程中运行。
ILoggerRepository loggerRepository = LogManager.CreateRepository(logFileName + "Repository");
ThreadContext.Properties["LogName"] = logFileName;
log4net.Config.XmlConfigurator.Configure(loggerRepository);
ILog logger = LogManager.GetLogger(logFileName + "Repository", "ProductionLogger");
到目前为止，这似乎没有任何问题。我现在将推进这个解决方案，但如果我发现其他任何内容，我会更新这篇文章。
答案 1 :(得分：4)
亚当的答案对我来说效果很好，但我想补充一点。如果您的应用程序中有可能重用logFileName，则需要检查以确保存储库尚不存在。
string repoName = String.Format("{0}Repository", logFileName);
// Check for existing repository
ILoggerRepository[] allRepos = LogManager.GetAllRepositories();
ILoggerRepository repo = allRepos.Where(x => x.Name == repoName).FirstOrDefault();
// If repository does not exist, create one, set the logfile name, and configure it
if (repo == null)
{
repo = LogManager.CreateRepository(repoName);
ThreadContext.Properties[KEY_LOG_FILE] = logFileName;
log4net.Config.XmlConfigurator.Configure(repo);
}
// Set logger
ILog logger = LogManager.GetLogger(repoName, logName);
答案 2 :(得分：0)
@ Adam的解决方案对我有所帮助。为了方便起见，下面的简单代码创建了5个任务（使用线程池中的线程），其中每个任务中的每个线程五次写入一个单独的日志文件（然后休眠1秒）。
.NET Framework 4.7.2
.NET控制台应用程序
AssemblyInfo.cs
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
// General Information about an assembly is controlled through the following
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("LogfilePerThread")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("Microsoft")]
[assembly: AssemblyProduct("LogfilePerThread")]
[assembly: AssemblyCopyright("Copyright © Microsoft 2020")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
// Setting ComVisible to false makes the types in this assembly not visible
// to COM components. If you need to access a type in this assembly from
// COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(false)]
// The following GUID is for the ID of the typelib if this project is exposed to COM
[assembly: Guid("d3ec8b29-e701-424e-80d4-473e9fbb5572")]
// Version information for an assembly consists of the following four values:
//
// Major Version
// Minor Version
// Build Number
// Revision
//
// You can specify all the values or you can default the Build and Revision Numbers
// by using the '*' as shown below:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]
Program.cs
using System;
using System.Threading;
using System.Threading.Tasks;
using log4net;
using log4net.Repository;
namespace LogfilePerThread
{
class Program
{
static void Main(string[] args)
{
int nWorkers = 5; // 5 workers, 5 log files
Task[] Workers = new Task[nWorkers];
for (int i = 0; i < nWorkers; i++)
{
int i1 = i;
Workers[i] = new Task(() => Work(i1));
Workers[i].Start();
}
Task.WaitAll(Workers);
Console.WriteLine("Main executed.");
}
public static void Work(int workerID)
{
// Make sure the directory where logfiles are written exists
string logfileName = $"Worker{workerID}_TaskLog"; // Logfile extension & path specified in App.config
ILoggerRepository repository = LogManager.CreateRepository($"{logfileName}Repository");
ThreadContext.Properties["WorkerLoggerProperty"] = logfileName;
log4net.Config.XmlConfigurator.Configure(repository);
ILog log = LogManager.GetLogger($"{logfileName}Repository", "WorkerLogger"); // Use this logger object in thread
// Do work: Log & Sleep
for (int i = 0; i < 5; i++)
{
log.Info($"Logging from WorkerID={workerID} - Msg {i}");
Thread.Sleep(1000);
}
}
}
}
App.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
</startup>
<log4net>
<logger name="WorkerLogger">
<level value="DEBUG" />
<appender-ref ref="RollingFile" />
</logger>
<appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="C:\logs\%property{WorkerLoggerProperty}.log" />
<appendToFile value="true" />
<immediateFlush value="true"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%5level, %thread] %message%newline" />
</layout>
</appender>
</log4net>
</configuration>
C：\ logs \ Worker0_TaskLog.log
2020-01-14 21:59:46,696 [ INFO, 3] Logging from WorkerID=0 - Msg 0
2020-01-14 21:59:47,714 [ INFO, 3] Logging from WorkerID=0 - Msg 1
2020-01-14 21:59:48,714 [ INFO, 3] Logging from WorkerID=0 - Msg 2
2020-01-14 21:59:49,714 [ INFO, 3] Logging from WorkerID=0 - Msg 3
2020-01-14 21:59:50,714 [ INFO, 3] Logging from WorkerID=0 - Msg 4
C：\ logs \ Worker1_TaskLog.log
2020-01-14 21:59:46,696 [ INFO, 4] Logging from WorkerID=1 - Msg 0
2020-01-14 21:59:47,714 [ INFO, 4] Logging from WorkerID=1 - Msg 1
2020-01-14 21:59:48,714 [ INFO, 4] Logging from WorkerID=1 - Msg 2
2020-01-14 21:59:49,714 [ INFO, 4] Logging from WorkerID=1 - Msg 3
2020-01-14 21:59:50,714 [ INFO, 4] Logging from WorkerID=1 - Msg 4
C：\ logs \ Worker2_TaskLog.log
2020-01-14 21:59:46,697 [ INFO, 5] Logging from WorkerID=2 - Msg 0
2020-01-14 21:59:47,713 [ INFO, 5] Logging from WorkerID=2 - Msg 1
2020-01-14 21:59:48,713 [ INFO, 5] Logging from WorkerID=2 - Msg 2
2020-01-14 21:59:49,713 [ INFO, 5] Logging from WorkerID=2 - Msg 3
2020-01-14 21:59:50,713 [ INFO, 5] Logging from WorkerID=2 - Msg 4
C：\ logs \ Worker3_TaskLog.log
2020-01-14 21:59:46,696 [ INFO, 6] Logging from WorkerID=3 - Msg 0
2020-01-14 21:59:47,714 [ INFO, 6] Logging from WorkerID=3 - Msg 1
2020-01-14 21:59:48,714 [ INFO, 6] Logging from WorkerID=3 - Msg 2
2020-01-14 21:59:49,714 [ INFO, 6] Logging from WorkerID=3 - Msg 3
2020-01-14 21:59:50,714 [ INFO, 6] Logging from WorkerID=3 - Msg 4
C：\ logs \ Worker4_TaskLog.log
2020-01-14 21:59:47,580 [ INFO, 7] Logging from WorkerID=4 - Msg 0
2020-01-14 21:59:48,580 [ INFO, 7] Logging from WorkerID=4 - Msg 1
2020-01-14 21:59:49,580 [ INFO, 7] Logging from WorkerID=4 - Msg 2
2020-01-14 21:59:50,580 [ INFO, 7] Logging from WorkerID=4 - Msg 3
2020-01-14 21:59:51,580 [ INFO, 7] Logging from WorkerID=4 - Msg 4