Csharp/C Sharp/Development Class/Log

Add a EventLogTraceListener to the listener collection and writing error messages to the Application log

/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa
Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
// LogTrace.cs -- Demonstrates adding a EventLogTraceListener to the listener
//                collection and writing error messages to the Application log.
//
//                Compile this program with the following command line:
//                    C:>csc /debug:full /d:TRACE LogTrace.cs
using System;
using System.Diagnostics;
namespace nsEventLogs
{
    public class LogTrace
    {
        static public void Main ()
        {
// Create the EventLog object
            EventLog EvLog = new EventLog ();
// Register the source if it has not already been registered
            if (!EventLog.SourceExists ("AppLog.exe"))
            {
                Console.WriteLine ("Creating event log source");
                EventLog.CreateEventSource ("AppLog.exe", "Application");
            }
            EvLog.Source = "AppLog.exe";
            Trace.Listeners.Add (new EventLogTraceListener (EvLog));
            Trace.Listeners.Add (new TextWriterTraceListener (Console.Out));
            Trace.WriteLine ("Debugging to the event log");
// Set the source for the messages to be display in the Event Viewer
            EvLog.Source = "AppLog.exe";
        }
    }
}

Demonstrates registering and event source and writing to the Application Log

/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa
Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
// AppLog.cs -- Demonstrates registering and event source and writing to the
//              Application Log.
//
//              Compile this program with the following command line:
//                  C:>csc AppLog
using System;
using System.Diagnostics;
using System.IO;
namespace nsEventLogs
{
    public class AppLog
    {
        static public void Main ()
        {
            // Create the EventLog object
            EventLog EvLog = new EventLog ();
            
            // Register the source if it has not already been registered
            if (!EventLog.SourceExists ("AppLog.exe"))
            {
                Console.WriteLine ("Creating event log source");
                EventLog.CreateEventSource ("AppLog.exe", "Application");
            }
            
            // Set the source for the messages to be display in the Event Viewer
            EvLog.Source = "AppLog.exe";
            // Throw an exception. You don"t have to do this, but it"s a good reason to
            // write to the log.
            try
            {
                CauseTrouble ();
            }
            catch (IOException)
            {
                // Write the information to the application log
                EvLog.WriteEntry("IO exception was thrown", EventLogEntryType.Warning);
            }
        }
        static void CauseTrouble ()
        {
            throw (new IOException());
        }
    }
}

Set Text Output To Event Log

/*
Professional Windows GUI Programming Using C#
by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury, 
   Zach Greenvoss, Shripad Kulkarni, Neil Whitlow
Publisher: Peer Information
ISBN: 1861007663
*/
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;
using System.Threading;
using System.Diagnostics;
namespace FibersTest
{
    /// <summary>
    /// Summary description for Form1.
    /// </summary>
    /// 
    
    public class fmrFibers : System.Windows.Forms.Form
    {
        private System.Windows.Forms.ListBox lstFibers;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        [DllImport("kernel32.dll")]
        extern static IntPtr ConvertThreadToFiber(int fiberData);
        [DllImport("kernel32.dll")]
        extern static IntPtr CreateFiber(int size, System.Delegate function, int handle);
        [DllImport("kernel32.dll")]
        extern static IntPtr SwitchToFiber(IntPtr fiberAddress);
        [DllImport("kernel32.dll")]
        extern static void DeleteFiber(IntPtr fiberAddress);
        [DllImport("kernel32.dll")]
        extern static int GetLastError();
        delegate void SetTextOutputToEventLog(int number);
        public fmrFibers()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
            Thread t1 = new Thread(new ThreadStart(NewThreadToFiberExecution));
            t1.Start();
        }
        void OutputLog(int fiberNumber)
        {
            this.Invoke(new AddToListBox(SetText), new object[]{fiberNumber});
            SwitchToFiber(obj);
        }
        void SetText(int message)
        {
            lstFibers.Items.Add("Fiber "+message.ToString()+" added this");
        }
        delegate void AddToListBox(int message);
        System.IntPtr obj;
        void NewThreadToFiberExecution()
        {
            try
            {
                SetTextOutputToEventLog stof = new SetTextOutputToEventLog(OutputLog);
                obj = ConvertThreadToFiber(0);
                long l1 = GetLastError();
                System.IntPtr retVal1 = CreateFiber(500, stof, 1);
                System.IntPtr retVal2 = CreateFiber(500, stof, 2);
                System.IntPtr retVal3 = CreateFiber(500, stof, 3);
                System.IntPtr retVal4 = CreateFiber(500, stof, 4);
                System.IntPtr retVal5 = CreateFiber(500, stof, 5);
                if(GetLastError()!=0) throw new Exception("Create Fiber failed!!");
                IntPtr fiber1return = SwitchToFiber(retVal1);
                IntPtr fiber2return = SwitchToFiber(retVal2);
                IntPtr fiber3return = SwitchToFiber(retVal3);
                IntPtr fiber4return = SwitchToFiber(retVal4);
                IntPtr fiber5return = SwitchToFiber(retVal5);
                
                if(GetLastError()!=0) throw new Exception("Create Fiber failed!!");
                DeleteFiber(retVal1);
                DeleteFiber(retVal2);
                DeleteFiber(retVal3);
                DeleteFiber(retVal4);
                DeleteFiber(retVal5);
            }
            catch(Exception e)
            {
                throw e;
            }
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.lstFibers = new System.Windows.Forms.ListBox();
            this.SuspendLayout();
            // 
            // lstFibers
            // 
            this.lstFibers.Name = "lstFibers";
            this.lstFibers.Size = new System.Drawing.Size(320, 212);
            this.lstFibers.TabIndex = 0;
            // 
            // fmrFibers
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(304, 213);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.lstFibers});
            this.Name = "fmrFibers";
            this.Text = "FibersTest";
            this.ResumeLayout(false);
        }
        #endregion
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new fmrFibers());
        }
    }
}

Test Log

using System;
using System.IO;
public class TestLog
{
     public static void Main()
    {
        string logFile = "LOGFILE.TXT";
        FileStream fs = new FileStream(logFile, FileMode.OpenOrCreate, FileAccess.Write);
        
        StreamWriter sw = new StreamWriter(fs);
        StreamReader sr = new StreamReader(fs);
        sw.WriteLine("First log entry");
        sw.WriteLine("Second log entry");
        while(sr.Peek() > -1)
        {
            Console.WriteLine(sr.ReadLine());
        }
        sw.Close();
        sr.Close();
        fs.Close();
    }
}