我有以下配置，但我无法找到任何有关如何设置日期滚动样式的最大备份文件数的文档。 我知道您可以通过使用 maxSizeRollBackups 以尺寸滚动方式完成此操作。
<appender name="AppLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="mylog.log" />
<appendToFile value="true" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<rollingStyle value="Date" />
<datePattern value=".yyMMdd.'log'" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%d %-5p %c - %m%n" />
</layout>
</appender>
尽管不支持，但我处理这种情况的方法如下：
这是我的配置：
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="C:\logs\LoggingTest\logfile.txt" />
<appendToFile value="true" />
<rollingStyle value="Composite" />
<datePattern value="yyyyMMdd" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="1MB" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date - %message%newline" />
</layout>
</appender>
在应用程序启动时我会：
XmlConfigurator.Configure();
var date = DateTime.Now.AddDays(-10);
var task = new LogFileCleanupTask();
task.CleanUp(date);
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using log4net;
using log4net.Appender;
using log4net.Config;
public class LogFileCleanupTask
{
#region - Constructor -
public LogFileCleanupTask()
{
}
#endregion
#region - Methods -
/// <summary>
/// Cleans up. Auto configures the cleanup based on the log4net configuration
/// </summary>
/// <param name="date">Anything prior will not be kept.</param>
public void CleanUp(DateTime date)
{
string directory = string.Empty;
string filePrefix = string.Empty;
var repo = LogManager.GetAllRepositories().FirstOrDefault(); ;
if (repo == null)
throw new NotSupportedException("Log4Net has not been configured yet.");
var app = repo.GetAppenders().Where(x => x.GetType() == typeof(RollingFileAppender)).FirstOrDefault();
if (app != null)
{
var appender = app as RollingFileAppender;
directory = Path.GetDirectoryName(appender.File);
filePrefix = Path.GetFileName(appender.File);
CleanUp(directory, filePrefix, date);
}
}
/// <summary>
/// Cleans up.
/// </summary>
/// <param name="logDirectory">The log directory.</param>
/// <param name="logPrefix">The log prefix. Example: logfile dont include the file extension.</param>
/// <param name="date">Anything prior will not be kept.</param>
public void CleanUp(string logDirectory, string logPrefix, DateTime date)
{
if (string.IsNullOrEmpty(logDirectory))
throw new ArgumentException("logDirectory is missing");
if (string.IsNullOrEmpty(logPrefix))
throw new ArgumentException("logPrefix is missing");
var dirInfo = new DirectoryInfo(logDirectory);
if (!dirInfo.Exists)
return;
var fileInfos = dirInfo.GetFiles("{0}*.*".Sub(logPrefix));
if (fileInfos.Length == 0)
return;
foreach (var info in fileInfos)
{
if (info.CreationTime < date)
{
info.Delete();
}
}
}
#endregion
}
Sub 方法是一种扩展方法，它基本上包装了 string.format，如下所示：
/// <summary>
/// Extension helper methods for strings
/// </summary>
[DebuggerStepThrough, DebuggerNonUserCode]
public static class StringExtensions
{
/// <summary>
/// Formats a string using the <paramref name="format"/> and <paramref name="args"/>.
/// </summary>
/// <param name="format">The format.</param>
/// <param name="args">The args.</param>
/// <returns>A string with the format placeholders replaced by the args.</returns>
public static string Sub(this string format, params object[] args)
{
return string.Format(format, args);
}
}
要限制日志数量，请勿在日期模式中包含年份或月份，例如日期模式值=“_dd'.log'”
这将每天创建一个新日志，并将在下个月被覆盖。
几个月前我花了一些时间研究这个问题。 v1.2.10 不支持根据日期滚动删除较旧的日志文件。它在下一个版本的任务列表中。我自己获取了源代码并添加了功能，如果其他人感兴趣的话，也可以将其发布给他们。该问题和补丁可以在 https://issues.apache.org/jira/browse/LOG4NET-27 .
找到不确定您到底需要什么。 以下是我的 lo4net.config 文件之一的摘录：
<appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
<param name="File" value="App_Data\log"/>
<param name="DatePattern" value=".yyyy-MM-dd-tt".log""/>
<param name="AppendToFile" value="true"/>
<param name="RollingStyle" value="Date"/>
<param name="StaticLogFileName" value="false"/>
<param name="maxSizeRollBackups" value="60" />
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%r %d [%t] %-5p %c - %m%n"/>
</layout>
</appender>
我最近在尝试根据传递到我的服务的 maxAgeInDays 配置值清理日志日志时遇到了这种需求...正如我之前的许多人一样，我接触到了 NTFS“功能”隧道，这使得使用 FileInfo.CreationDate有问题（尽管我后来也解决了这个问题）...
由于我有一个模式需要遵循，所以我决定推出自己的清理方法...我的记录器是以编程方式配置的，因此我只需在记录器设置完成后调用以下命令...
//.........................
//Log Config Stuff Above...
log4net.Config.BasicConfigurator.Configure(fileAppender);
if(logConfig.DaysToKeep > 0)
CleanupLogs(logConfig.LogFilePath, logConfig.DaysToKeep);
}
static void CleanupLogs(string logPath, int maxAgeInDays)
{
if (File.Exists(logPath))
{
var datePattern = "yyyy.MM.dd";
List<string> logPatternsToKeep = new List<string>();
for (var i = 0; i <= maxAgeInDays; i++)
{
logPatternsToKeep.Add(DateTime.Now.AddDays(-i).ToString(datePattern));
}
FileInfo fi = new FileInfo(logPath);
var logFiles = fi.Directory.GetFiles(fi.Name + "*")
.Where(x => logPatternsToKeep.All(y => !x.Name.Contains(y) && x.Name != fi.Name));
foreach (var log in logFiles)
{
if (File.Exists(log.FullName)) File.Delete(log.FullName);
}
}
}
可能不是最漂亮的方法，但对于我们的目的来说效果很好......
NLog，其设置方式与 Log4Net 几乎相同（并且得到积极维护 - 甚至支持 .NET Core），支持基于日期的滚动日志。
从 log4net 附加程序继承并添加您自己的覆盖方法来执行文件清理是相当容易的。我重写了 OpenFile 来执行此操作。以下是一个自定义 log4net 附加程序的示例，可帮助您入门：https://stackoverflow.com/a/2385874/74585
不再担心每个日期更复杂的 x 和指定的任意文件计数，而是将其放在一起。请小心 [SecurityAction.Demand]。
public string LogPath { get; set; }
public int MaxFileCount { get; set; } = 10;
private FileSystemWatcher _fileSystemWatcher;
[PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
public async Task StartAsync()
{
await Task.Yield();
if (!Directory.Exists(LogPath))
{ Directory.CreateDirectory(LogPath); }
_fileSystemWatcher = new FileSystemWatcher
{
Filter = "*.*",
Path = LogPath,
EnableRaisingEvents = true,
NotifyFilter = NotifyFilters.FileName
| NotifyFilters.LastAccess
| NotifyFilters.LastWrite
| NotifyFilters.Security
| NotifyFilters.Size
};
_fileSystemWatcher.Created += OnCreated;
}
public async Task StopAsync()
{
await Task.Yield();
_fileSystemWatcher.Created -= OnCreated; // prevents a resource / memory leak.
_fileSystemWatcher = null; // not using dispose allows us to re-start if necessary.
}
private void OnCreated(object sender, FileSystemEventArgs e)
{
var fileInfos = Directory
.GetFiles(LogPath)
.Select(filePath => new FileInfo(filePath))
.OrderBy(fileInfo => fileInfo.LastWriteTime)
.ToArray();
if (fileInfos.Length <= MaxFileCount)
{ return; }
// For every file (over MaxFileCount) delete, starting with the oldest file.
for (var i = 0; i < fileInfos.Length - MaxFileCount; i++)
{
try
{
fileInfos[i].Delete();
}
catch (Exception ex)
{
/* Handle */
}
}
}
所以这似乎归结为这样一个事实：使用日期作为名称时不会执行任何操作？我将其设置为 3，但它仍然每天创建超过 3 个字段，并且它似乎还保存超过 3 天的文件。