使用log4net记录日志，会出现日志文件过大的问题。
下面是完整的日志类，开箱即用：
（1）制定日志路径；
（2）按日期记录文件；
（3）可限制文件大小；
（4）定期清理超过1个月（自定义）事件的日志；
（5）可跟踪记录日志是【哪个类】的【哪个方法】；
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using log4net;
/// <summary>
/// 日志记录类，log4net
/// LOG文件夹，每个日期一个文件
/// 默认最大100MB一个文件
/// </summary>
public class Loger
{
public Loger()
{
this.init();
}
private ILog loger;
private string IsInfo;//是否记录info日志开关 2019-01-18
private DateTime LastClearTime;
public string logPath = "";
private void init()
{
//下面两句应该放在网站刚刚启动时加载,并放在一个静态方法里方便调用
log4net.Appender.RollingFileAppender appender = new log4net.Appender.RollingFileAppender();
string maxFileSize = "";
//读取配置文件，有配置固定目录的，使用固定目录
try
{
string path = System.Configuration.ConfigurationSettings.AppSettings["NIS_LOG_PATH"];//日志文件存储路径
maxFileSize = System.Configuration.ConfigurationSettings.AppSettings["NIS_LOG_FILE_SIZE"]; //日志文件大小 默认"10MB"一个;
if (string.IsNullOrEmpty(path) == false)
{
if (System.IO.Directory.Exists(path) == false)
{
System.IO.Directory.CreateDirectory(path);
}
appender.File = path;
}
else
{
appender.File = "ErrorLog\\";
}
if(string.IsNullOrEmpty(maxFileSize))
{
maxFileSize = "10MB";
}
}
catch (Exception ex)
{
//System.Windows.Forms.MessageBox.Show("Log init erro:" + ex.Message + " " + ex.StackTrace);
appender.File = "ErrorLog\\";
}
logPath = appender.File;
appender.AppendToFile = true;
appender.MaxSizeRollBackups = -1;
appender.MaximumFileSize = maxFileSize;
appender.RollingStyle = log4net.Appender.RollingFileAppender.RollingMode.Composite;//混合模式，即按日期，也按文件大小分隔
appender.DatePattern = "NIS_yyyy-MM-dd\".txt\"";
appender.StaticLogFileName = false;
appender.LockingModel = new log4net.Appender.FileAppender.MinimalLock();
appender.Layout = new log4net.Layout.PatternLayout("%d [%t] %-5p %c - (%line) %m%n");// "%date [%thread] %-5level - %message%newline");
appender.ActivateOptions();
log4net.Config.BasicConfigurator.Configure(appender);
loger = LogManager.GetLogger("NIS");
var rootAppender = ((log4net.Repository.Hierarchy.Hierarchy)LogManager.GetRepository())
.Root.Appenders.OfType<log4net.Appender.FileAppender>()
.FirstOrDefault();
logPath = rootAppender != null ? rootAppender.File : string.Empty;
LastClearTime = DateTime.Now;
}
private string lastAssm = "";
public void SaveLog(string info)
{
if (string.IsNullOrEmpty(this.IsInfo) == false && this.IsInfo.Equals("1"))
{
//为1则不记录 默认则记录
}
else
{
//记录谁调用
string rt = "";
//获取调用方法
rt = GetMehtodTraceStr();
if (lastAssm != rt)
{
lastAssm = rt;
loger.Info(rt + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss,fff [1] INFO - ") + info);
}
else
{
loger.Info(info);
}
ClearLog();
}
}
public void SaveExceptionLog(string info, Exception ex)
{
//记录谁调用
string rt = "";
//获取调用方法
rt = JHNISCommonManage.GetInstance().GetMehtodTraceStr();
if (lastAssm != rt)
{
lastAssm = rt;
loger.Error(rt + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss,fff [1] INFO - ") + info, ex);
}
else
{
loger.Error(info, ex);
}
loger.Error(rt + info, ex);
ClearLog();
}
private void ClearLog()
{
try
{
if ((DateTime.Now - LastClearTime).TotalMinutes > 10)
{
string path = logPath.Replace(logPath.Split('\\')[logPath.Split('\\').Length - 1], "");
string[] files = System.IO.Directory.GetFiles(path);
foreach (string f in files)
{
string date = f.Split('\\')[f.Split('\\').Length - 1];
date = date.Split('.')[0];
DateTime dtLog;
if (DateTime.TryParse(date, out dtLog))
{
if ((DateTime.Now - dtLog).TotalDays > 7)
{
try
{
System.IO.File.Delete(f);
}
catch (Exception ex)
{
}
}
}
}
LastClearTime = DateTime.Now;
}
}
catch (Exception ex)
{
//System.Windows.Forms.MessageBox.Show("ClearLog erro:" + ex.Message + " " + ex.StackTrace);
SaveLog("清空历史日志失败:" + ex.Message);
}
}
}获取方法调用者（DLL类、方法名）
#region 获取方法调用者（DLL类、方法名）
/// <summary>
/// 获取方法调用者（DLL类、方法名）
/// </summary>
/// <returns></returns>
public List<string> GetMehtodTrace()
{
List<string> lst = new List<string>();
StackTrace trace = new StackTrace();
foreach (StackFrame frame in trace.GetFrames())
{
var m = frame.GetMethod();
if (m == null || m.ReflectedType == null || m.ReflectedType.Assembly == null)
{
continue;
}
var tp = m.GetType();
if (m.ReflectedType.Assembly.Location.ToUpper().Contains("SYSTEM.") == false &&
m.ReflectedType.Assembly.Location.ToUpper().Contains("MICROSOFT.NET") == false &&
m.ReflectedType.ToString().Contains("Loger") == false &&
m.ReflectedType.ToString().Contains("DataProvider") == false &&
m.ReflectedType.ToString().Contains("Microsoft.NET") == false)
{
if (m.ReflectedType.ToString().Contains("CommonManage") &&
(m.Name == "SaveLog" ||m.Name == "SaveExceptionLog"
|| m.Name == "GetMehtodTrace" || m.Name == "GetMehtodTraceStr"
||m.Name== ".ctor"
||m.Name=="GetDataSet"))
{
continue;
}
var rt = m.ReflectedType.Assembly.Location + " 类:" + m.ReflectedType.Name + " 方法:" + m.Name + "\r\n";
lst.Add(rt);
if(lst.Count>=2)
{
break;
}
}
}
return lst;
}
/// <summary>
/// 获取方法调用者（DLL类、方法名）
/// </summary>
/// <returns></returns>
public string GetMehtodTraceStr()
{
string rt = "";
var lst = GetMehtodTrace();
rt = string.Concat(lst);
return rt;
}
#endregion 获取方法调用者（DLL类、方法名）
