RichTextBoxAppender using log4net

Question

Is there a way to programmatically create a RichTextBoxAppender using log4net? In other words, no xml app.config?

Answer 1

using System; using System.Windows.Forms; using System.Drawing; using log4net; using log4net.Core; using log4net.Appender; using log4net.Util; namespace Vip.Logging { /// <summary> /// Description of RichTextBoxAppender. /// </summary> public class RichTextBoxAppender : AppenderSkeleton { #region Private Instance Fields private RichTextBox richTextBox = null; private Form containerForm = null; private LevelMapping levelMapping = new LevelMapping(); private int maxTextLength = 100000; #endregion private delegate void UpdateControlDelegate(LoggingEvent loggingEvent); #region Constructor public RichTextBoxAppender(RichTextBox myRichTextBox) : base() { richTextBox = myRichTextBox; containerForm = (Form)richTextBox.Parent; } #endregion private void UpdateControl(LoggingEvent loggingEvent) { // There may be performance issues if the buffer gets too long // So periodically clear the buffer if (richTextBox.TextLength > maxTextLength) { richTextBox.Clear(); richTextBox.AppendText(string.Format("(Cleared log length max: {0})\n", maxTextLength)); } // look for a style mapping LevelTextStyle selectedStyle = levelMapping.Lookup(loggingEvent.Level) as LevelTextStyle; if (selectedStyle != null) { // set the colors of the text about to be appended richTextBox.SelectionBackColor = selectedStyle.BackColor; richTextBox.SelectionColor = selectedStyle.TextColor; // alter selection font as much as necessary // missing settings are replaced by the font settings on the control if (selectedStyle.Font != null) { // set Font Family, size and styles richTextBox.SelectionFont = selectedStyle.Font; } else if (selectedStyle.PointSize > 0 && richTextBox.Font.SizeInPoints != selectedStyle.PointSize) { // use control font family, set size and styles float size = selectedStyle.PointSize > 0.0f ? selectedStyle.PointSize : richTextBox.Font.SizeInPoints; richTextBox.SelectionFont = new Font(richTextBox.Font.FontFamily.Name, size, selectedStyle.FontStyle); } else if (richTextBox.Font.Style != selectedStyle.FontStyle) { // use control font family and size, set styles richTextBox.SelectionFont = new Font(richTextBox.Font, selectedStyle.FontStyle); } } richTextBox.AppendText(RenderLoggingEvent(loggingEvent)); } protected override void Append(LoggingEvent LoggingEvent) { if (richTextBox.InvokeRequired) { richTextBox.Invoke( new UpdateControlDelegate(UpdateControl), new object[] { LoggingEvent }); } else { UpdateControl(LoggingEvent); } } public void AddMapping(LevelTextStyle mapping) { levelMapping.Add(mapping); } public override void ActivateOptions() { base.ActivateOptions(); levelMapping.ActivateOptions(); } protected override bool RequiresLayout { get { return true; } } } public class LevelTextStyle : LevelMappingEntry { private Color textColor; private Color backColor; private FontStyle fontStyle = FontStyle.Regular; private float pointSize = 0.0f; private bool bold = false; private bool italic = false; private string fontFamilyName = null; private Font font = null; public bool Bold { get { return bold; } set { bold = value; } } public bool Italic { get { return italic; } set { italic = value; } } public float PointSize { get { return pointSize; } set { pointSize = value; } } /// <summary> /// Initialize the options for the object /// </summary> /// <remarks>Parse the properties</remarks> public override void ActivateOptions() { base.ActivateOptions(); if (bold) fontStyle |= FontStyle.Bold; if (italic) fontStyle |= FontStyle.Italic; if (fontFamilyName != null) { float size = pointSize > 0.0f ? pointSize : 8.25f; try { font = new Font(fontFamilyName, size, fontStyle); } catch (Exception) { font = new Font("Arial", 8.25f, FontStyle.Regular); } } } public Color TextColor { get { return textColor; } set { textColor = value; } } public Color BackColor { get { return backColor; } set { backColor = value; } } public FontStyle FontStyle { get { return fontStyle; } set { fontStyle = value; } } public Font Font { get { return font; } set { font = value; } } } } public partial class MainForm : Form { private static string locPath = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData); private static string dskPath = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory); private RichTextBoxAppender rba; private MessageBoxAppender mba; public MainForm() { InitializeComponent(); if (!Global.logger.Logger.Repository.Configured) { rba = new RichTextBoxAppender(richTextBoxLog); rba.Threshold = Level.All; rba.Layout = new PatternLayout("%date{dd-MM-yyyy HH:mm:ss.fff} %5level %message %n"); LevelTextStyle ilts = new LevelTextStyle(); ilts.Level = Level.Info; ilts.TextColor = Color.Yellow; ilts.PointSize = 10.0f; rba.AddMapping(ilts); LevelTextStyle dlts = new LevelTextStyle(); dlts.Level = Level.Debug; dlts.TextColor = Color.LightBlue; dlts.PointSize = 10.0f; rba.AddMapping(dlts); LevelTextStyle wlts = new LevelTextStyle(); wlts.Level = Level.Warn; wlts.TextColor = Color.Chartreuse; wlts.PointSize = 10.0f; rba.AddMapping(wlts); LevelTextStyle elts = new LevelTextStyle(); elts.Level = Level.Error; elts.TextColor = Color.Crimson; elts.BackColor = Color.Cornsilk; elts.PointSize = 10.0f; rba.AddMapping(elts); BasicConfigurator.Configure(rba); rba.ActivateOptions(); mba = new MessageBoxAppender(); mba.Layout = new PatternLayout("%date{dd-MM-yyyy HH:mm:ss.fff} %5level %message %n"); mba.Threshold = Level.Error; BasicConfigurator.Configure(mba); mba.ActivateOptions(); RollingFileAppender fa = new RollingFileAppender(); fa.AppendToFile = true; fa.Threshold = log4net.Core.Level.All; fa.RollingStyle = RollingFileAppender.RollingMode.Size; fa.MaxFileSize = 100000; fa.MaxSizeRollBackups = 3; fa.File = dskPath + @"\FgPleoraLog.txt"; fa.Layout = new log4net.Layout.PatternLayout("%date{dd-MM-yyyy HH:mm:ss.fff} %5level %message (%logger{1}:%line)%n"); log4net.Config.BasicConfigurator.Configure(fa); fa.ActivateOptions(); } } 

Answer 2

Answer to

@GMAN is correct, but Invoke => BeginInvoke may be thread safe. you can see my thread Why did my log4net get stuck?