Using Apache log4net in C#/.NET

Here are the steps;

• Download the latest version of log4net library from Apache web site and add reference of log4net.dll in to your project.
• Go to your project's AssemblyInfo.cs file and add below line at the end of it.                       [assembly: log4net.Config.XmlConfigurator(Watch = true)]

• Go to your project's Web.config file and add these in it, just below <configuration> tag.

<configSections>

    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=1b44e1d426115821" />

  </configSections>

  <!-- Log4net Logging Setup -->

  <log4net>

    <appender name="FileAppender" type="log4net.Appender.FileAppender,log4net">

      <file value="c:\\mylogfile.txt" />

      <appendToFile value="true" />

      <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />

      <layout type="log4net.Layout.PatternLayout">

        <conversionPattern value="%date [%thread] %level %logger - %message%newline" />

      </layout>

      <filter type="log4net.Filter.LevelRangeFilter">

        <levelMin value="INFO" />

        <levelMax value="FATAL" />

      </filter>

    </appender>

    <root>

      <level value="DEBUG"/>

      <appender-ref ref="FileAppender"/>

    </root>

  </log4net>

<!--<appSettings>

    <add key="filePath" value="C:\folder_name\temp\"/>

  </appSettings>-->

• Code you program. Here is my sample web service running an .exe and also creating its own log data.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Services;

using System.IO;

using System.Diagnostics;

using System.Security.Principal;

using System.Security;

using System.Runtime.InteropServices;

using System.Configuration;

using System.Web.Configuration;

using log4net;

namespace SampleWS

{

    /// <summary>

    /// Summary description for Service1

    /// </summary>

    [WebService(Namespace = "http://tempuri.org/")]

    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

    [System.ComponentModel.ToolboxItem(false)]

    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.

    // [System.Web.Script.Services.ScriptService]

    public class SampleWebService : System.Web.Services.WebService

    {

        ILog log = log4net.LogManager.GetLogger(typeof(SampleWebService));

        [WebMethod]

        public bool SampleWorker(string filePath)

        {

            //.exe dosyası Web.config dosyası dizini seviyesine kopyalanmalıdır.

            string htm = ".htm";

            log4net.Config.BasicConfigurator.Configure();

            #region [ Notlar ]

            //ILog log = log4net.LogManager.GetLogger(typeof(SampleWebService));

            //log.Debug("test debug message");

            //log.Warn("test warn message");

            //log.Error("test error message");

            //log.Fatal("test fatal message");

            //Console.ReadLine();

            #endregion

            try

            {

                string iFileName = Path.GetFileName(filePath);

                string oFileName = iFileName.Substring(0, iFileName.IndexOf(htm));

                //string htmFilePath = filePath.Substring(0, filePath.IndexOf(iFileName));

                string htmFilePath = ConfigurationManager.AppSettings["filePath"].ToString();

                string xlsFilePath = ConfigurationManager.AppSettings["filePath"].ToString();

                ProcessStartInfo startInfo = new ProcessStartInfo();

                startInfo.CreateNoWindow = true;

                startInfo.UseShellExecute = false;

                startInfo.WorkingDirectory = xlsFilePath;

                startInfo.FileName = Server.MapPath("test.exe");

                startInfo.RedirectStandardError = true;

                startInfo.RedirectStandardOutput = true;

                startInfo.Arguments = "-i:" + htmFilePath + iFileName + " -o:" + xlsFilePath + oFileName + ".xls";

                //string htmlFilePathControl = Path.GetFullPath(filePath);

                string htmlFilePathControl = htmFilePath + iFileName;

                string xlsFilePathControl = xlsFilePath + oFileName + ".xls";

                if (File.Exists(htmlFilePathControl))

                {

                    log.Info(iFileName + " isimli dosya bulundu");

                    try

                    {

                        using (Process process = Process.Start(startInfo))

                        {

                            process.StartInfo.RedirectStandardError = true;

                            process.StartInfo.RedirectStandardOutput = true;

                            process.OutputDataReceived += new DataReceivedEventHandler(process_OutputDataReceived);

                            process.ErrorDataReceived += new DataReceivedEventHandler(process_ErrorDataReceived);

                            process.BeginOutputReadLine();

                            process.BeginErrorReadLine();

                            log.Info("test.exe calistirildi");

                            process.WaitForExit();

                            if (process.ExitCode == 0)

                            {

                                process.Close();

                                log.Info(oFileName + "isimli .xls olusturuldu");

                                return File.Exists(xlsFilePathControl); //Dosya olustuysa true doner

                            }

                            else

                            {

                                //string output = process.StandardOutput.ReadToEnd();

                                log.Error(oFileName + ".xls olusturulamadi");

                                return false;

                            }

                        }

                    }

                    catch (Exception ex)

                    {

                        log.Error(oFileName + ".xls olusturulamadi. Hata: " + ex.Message);

                        return false;

                        //throw;

                    }

                }

                else

                {

                    log.Error(iFileName + " isimli dosya bulunamadi");

                    return false;

                }

            }

            catch (Exception e)

            {

                log.Error("test.exe calismasi oncesinde hata: " + e.Message);

                return false;

                //throw;

            }

        }

        void process_ErrorDataReceived(object sender, DataReceivedEventArgs e)

        {

            log.Error(e.Data);

        }

        void process_OutputDataReceived(object sender, DataReceivedEventArgs e)

        {

            log.Error(e.Data);

        }

    }

}

• And here is how the log file looks like;

That's all! Happy coding!