PostSharp 结合 log4net 自动记录日志

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>

  <log4net>
    <!-- You can add your own appender here. -->
    <!-- Define some output appenders -->
    <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
      </layout>
    </appender>
    <!--
    This appender is used for writing application log.
    -->
    <appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
      <!-- Log file name, you can find the file in the application startup directory. -->
      <param name="File" type="log4net.Util.PatternString" value="Log\Client_%date{yyyyMMddHHmmss}.log"/>
      <param name="Encoding" value="UTF-8"/>
      <param name="AppendToFile" value="true"/>
      <param name="MaxSizeRollBackups" value="10"/>
      <!-- 
      The maximum size of the log file, 
      when the log file size exceed this size, 
      a new log.txt will created and the old one will rename to log.txt.1.
      -->
      <param name="MaximumFileSize" value="2MB"/>
      <param name="RollingStyle" value="Size"/>
      <param name="StaticLogFileName" value="true"/>
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="%date [%thread] %logger %-5level - %message%newline"/>
      </layout>
    </appender>
    <!-- 
    The root logger.
    Set the level to log the necessary log information only.
    The level can be set to: ALL, DEBUG, INFO, WARN, ERROR, Fatal
    The appender-ref can be set the any appender name in this configuration file.
    -->
    <root>
      <level value="ALL"/>
      <appender-ref ref="RollingFileAppender"/>
      <appender-ref ref="ConsoleAppender"/>

    </root>
  </log4net>
</configuration>

using System.Linq;
using System.Reflection;
using System.Text;
using System.Windows.Forms;
using log4net;

namespace PostSharp.Demo
{
    public partial class TestLog4netFrm : Form
    {
        public static log4net.ILog _logger = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        public TestLog4netFrm()
        {
            InitializeComponent();
        }

        private void TestLog4netFrm_Load(object sender, EventArgs e)
        {
            _logger.Debug("test log4net ");
        }
    }
}

using System;
using System.Collections.Generic;
using System.Text;
using PostSharp.Aspects;
using PostSharp.Extensibility; 
using System.Reflection;

namespace PostSharp.Core
{
    [Serializable]
    public sealed class TraceAttribute : OnMethodBoundaryAspect
    {
        // Create a logger for use in this class, called only once
        private static readonly log4net.ILog _logger;

        private string _methodName;

        // These fields are initialized at runtime. They do not need to be serialized.
        [NonSerialized]
        private int _hashCode;

        static TraceAttribute()
        {
            if (!PostSharpEnvironment.IsPostSharpRunning)
            {
                _logger =
                    log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
            }
        }


        // Default constructor, invoked at build time.
        public TraceAttribute()
        {
            // Do nothing
        }

        // Invoked only once at runtime from the static constructor of type declaring the target method.
        public override void CompileTimeInitialize(MethodBase method, AspectInfo aspectInfo)
        {
            _methodName = method.DeclaringType.Name + "." + method.Name;
        }


        // Invoked only once at runtime from the static constructor of type declaring the target method.
        public override void RuntimeInitialize(MethodBase method)
        {
            _hashCode = this.GetHashCode();
        }

        // Invoked at runtime before that target method is invoked.
        public override void OnEntry(MethodExecutionArgs args)
        {
            _logger.DebugFormat(">>> Entry [{0}] {1}", _hashCode, _methodName);
        }

        // Invoked at runtime after the target method is invoked (in a finally block).
        public override void OnExit(MethodExecutionArgs args)
        {
            _logger.DebugFormat("<<< Exit [{0}] {1}", _hashCode, _methodName);
        }

        // Invoked at runtime when there is unhandled exception from the target method
        public override void OnException(MethodExecutionArgs args)
        {
            string expMsg = string.Format("!!! Exception [{0}] {1} {2}", _hashCode, _methodName, args.Exception.Message);
            _logger.ErrorFormat(expMsg, args.Exception);
        }

        // Invoked at runtime when await starts in the target method
        public override void OnYield(MethodExecutionArgs args)
        {
            _logger.DebugFormat("--- OnYield [{0}] {1}", _hashCode, _methodName);
        }

        // Invoked at runtime when await resumed in the target method
        public override void OnResume(MethodExecutionArgs args)
        {
            _logger.DebugFormat("--- OnResume [{0}] {1}", _hashCode, _methodName);
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using log4net;
using PostSharp.Core;
using System.Reflection;

namespace PostSharp.Demo
{
    public partial class TestPostSharpFrm : Form
    {
        public static log4net.ILog _logger = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        public TestPostSharpFrm()
        {
            InitializeComponent();
        }

        [Trace]
        private void TestPostSharpFrm_Load(object sender, EventArgs e)
        {

        }
    }
}