log4net源码（log4net appender）
本文目录一览：
如何动态修改log4net日志文件路径
1.配置文档
appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender"
!--配置文件路径log4net源码；这里修改源码log4net源码，在调用LogManager.GetLogger(name)时，name结构是Client_LogType_logger--
file value="logs/%Client/%LogType/" /
!--是否追加到文件--
appendToFile value="true" /
!--最大变换数量，-1为不限制--
MaxSizeRollBackups value="-1" /
!--文件大小--
MaximumFileSize value="1MB"/
encoding value="utf-8" /
!--文件以那种方式变换文件名log4net源码：data日期/Size大小/Composite同时按照日期和大小--
rollingStyle value="Composite" /
!--文件名格式--
datePattern value=""log_"yyyyMMdd
如何在通用权限管理系统中集成log4net日志功能
首先在官网下载最新源码，目前的源码可用VS2010打开。
源码中已经实现了可以日志输出到MSSQL的功能，但我的项目目前使用的都是Oracle数据库，源码中是没有实现的，需要自己实现一下：
public class OracleAppender : BufferingAppenderSkeleton
{
// Fields
private static readonly Type declaringType = typeof(AdoNetAppender);
private string m_commandText;
private CommandType m_commandType = CommandType.Text;
private string m_connectionString;
private string m_connectionType;
private OracleCommand m_dbCommand;
private OracleConnection m_dbConnection;
protected ArrayList m_parameters = new ArrayList();
private bool m_reconnectOnError = false;
private SecurityContext m_securityContext;
protected bool m_usePreparedCommand;
private bool m_useTransactions = true;
// Methods
public override void ActivateOptions()
{
base.ActivateOptions();
this.m_usePreparedCommand = (this.m_commandText != null) (this.m_commandText.Length 0);
if (this.m_securityContext == null)
{
this.m_securityContext = SecurityContextProvider.DefaultProvider.CreateSecurityContext(this);
}
this.InitializeDatabaseConnection();
this.InitializeDatabaseCommand();
}
public void AddParameter(OracleAppenderParameter parameter)
{
this.m_parameters.Add(parameter);
}
protected virtual string GetLogStatement(LoggingEvent logEvent)
{
if (this.Layout == null)
{
this.ErrorHandler.Error("ADOAppender: No Layout specified.");
return "";
}
StringWriter writer = new StringWriter(CultureInfo.InvariantCulture);
this.Layout.Format(writer, logEvent);
return writer.ToString();
}
private void InitializeDatabaseCommand()
{
if ((this.m_dbConnection != null) this.m_usePreparedCommand)
{
try
{
this.m_dbCommand = this.m_dbConnection.CreateCommand();
this.m_dbCommand.CommandText = this.m_commandText;
this.m_dbCommand.CommandType = this.m_commandType;
}
catch (Exception exception)
{
this.ErrorHandler.Error("Could not create database command [" + this.m_commandText + "]", exception);
if (this.m_dbCommand != null)
{
try
{
this.m_dbCommand.Dispose();
}
catch
{
}
this.m_dbCommand = null;
}
}
if (this.m_dbCommand != null)
{
try
{
foreach (OracleAppenderParameter parameter in this.m_parameters)
{
try
{
parameter.Prepare(this.m_dbCommand);
}
catch (Exception exception2)
{
this.ErrorHandler.Error("Could not add database command parameter [" + parameter.ParameterName + "]", exception2);
throw;
}
}
}
catch
{
try
{
this.m_dbCommand.Dispose();
}
catch
{
}
this.m_dbCommand = null;
}
}
if (this.m_dbCommand != null)
{
try
{
this.m_dbCommand.Prepare();
}
catch (Exception exception3)
{
this.ErrorHandler.Error("Could not prepare database command [" + this.m_commandText + "]", exception3);
try
{
this.m_dbCommand.Dispose();
}
catch
{
}
this.m_dbCommand = null;
}
}
}
}
private void InitializeDatabaseConnection()
{
try
{
this.m_dbConnection = new OracleConnection();
this.m_dbConnection.ConnectionString = this.m_connectionString;
using (this.SecurityContext.Impersonate(this))
{
this.m_dbConnection.Open();
}
}
catch (Exception exception)
{
this.ErrorHandler.Error("Could not open database connection [" + this.m_connectionString + "]", exception);
this.m_dbConnection = null;
}
}
protected override void OnClose()
{
base.OnClose();
if (this.m_dbCommand != null)
{
this.m_dbCommand.Dispose();
this.m_dbCommand = null;
}
if (this.m_dbConnection != null)
{
this.m_dbConnection.Close();
this.m_dbConnection = null;
}
}
protected virtual Type ResolveConnectionType()
{
Type type;
try
{
type = SystemInfo.GetTypeFromString(this.m_connectionType, true, false);
}
catch (Exception exception)
{
this.ErrorHandler.Error("Failed to load connection type [" + this.m_connectionType + "]", exception);
throw;
}
return type;
}
protected override void SendBuffer(LoggingEvent[] events)
{
if (this.m_reconnectOnError ((this.m_dbConnection == null) || (this.m_dbConnection.State != ConnectionState.Open)))
{
LogLog.Debug(declaringType, "OracleAppender: Attempting to reconnect to database. Current Connection State: " + ((this.m_dbConnection == null) ? "null" : this.m_dbConnection.State.ToString()));
this.InitializeDatabaseConnection();
this.InitializeDatabaseCommand();
}
if ((this.m_dbConnection != null) (this.m_dbConnection.State == ConnectionState.Open))
{
if (this.m_useTransactions)
{
OracleTransaction dbTran = null;
try
{
dbTran = this.m_dbConnection.BeginTransaction();
this.SendBuffer(dbTran, events);
dbTran.Commit();
}
catch (Exception exception)
{
if (dbTran != null)
{
try
{
dbTran.Rollback();
}
catch (Exception)
{
}
}
this.ErrorHandler.Error("Exception while writing to database", exception);
}
}
else
{
this.SendBuffer(null, events);
}
}
}
如何使用log4net
下载Log4net源码和选择Log4net.config的Log记录配置文件（有的因为在web.config中统一记录）
下载源码后，使用VS工具打开，编译一下项目即可获得log4net.dll文件
如果找不到路径，可以点击vs项目的属性，查看输入路径在哪里，一般为解压根目录下的build目录，当然你可以自己修改
在C#项目中添加Log4net.dll引用，找到项目选择引用，选择好Log4net.dll文件，添加完成后，编译下，在项目的bin文件夹下即可看到Log4net.dll文件
在项目的程序集信息描述文件中，设置Log4net的可记录属性
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
在根目录下添加Log4net的配置文件。可以是App.config、web.config、Log4net.config均可
程序中引用Log4net，记录Log
查看Log文件
Log4net能否写入MySql
我的winform程序也不行，不知道什么地方出了问题。楼主有解决办法麻烦告诉下。 查了下源码，我的似乎是找不到MySql.Data
//////////////////////
我的解决了，似乎直接添加MySql.Data的引用并不起作用，还需要把MySql.Data.dll考到bin目录下，这样它才能找到。
/////////////////////
我的当时也是插入数据库什么的没有问题，你可以用log4net源码自己编译引用，然后就可以进去单步调试了，看什么地方出了问题，我的是数据库连接没有建立成功，但又没有抛出异常。再不行，你就留个邮箱吧。
