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copied!<p>The log4net <code>FileAppender</code> classes don't provide a <code>BufferSize</code> property, so you cannot set it - directly, in configuration or using that extension method. (This property is only exposed by the <code>BufferingAppenderSkeleton</code> base class, which is however not a base class for the <code>FileAppender</code> classes).</p> <p>Actually, spelunking in the log4net code base, it looks as if that the only way you could control the buffer size used by a <code>FileAppender</code>, is to write your own implementation of a <code>LockingModelBase</code>. Those implementations that come with log4net, i.e. <code>ExclusiveLock</code> or <code>MinimalLock</code>, internally use a <code>FileStream</code> constructor, that uses the default buffer size of 0x1000, i.e. 4096.</p> <p>Having that said, you might be able to do something like this:</p> <pre><code>.Log4Net<RollingFileAppender>(x=> { x.AppendToFile = true; x.Threshold = Level.Debug; x.MaxSizeRollBackups = 10; x.RollingStyle = RollingFileAppender.RollingMode.Size; x.File = "c:\\Logs\\log.txt"; x.LockingModel = new MyUnbufferedLockingModel(); }) </code></pre> <p>With <code>MyUnbufferedLockingModel</code> something like this:</p> <pre><code> public class MyUnbufferedLockingModel : log4net.FileAppender.LockingModelBase { // This is essentially a rip-off of the default 'ExclusiveLock' class, // but when creating the "m_stream", using an explicit buffer size of 1. // Depending on your needs you may want to use the 'MinimalLock' class // instead. private Stream m_stream = null; public override Stream AcquireLock() { return m_stream; } public override void CloseFile() { using (CurrentAppender.SecurityContext.Impersonate(this)) { m_stream.Close(); } } public override void OpenFile(string filename, bool append, Encoding encoding) { try { using (CurrentAppender.SecurityContext.Impersonate(this)) { string directoryName = Path.GetDirectoryName(filename); if (!Directory.Exists(directoryName)) { Directory.CreateDirectory(directoryName); } FileMode mode = append ? FileMode.Append : FileMode.Create; m_stream = new FileStream(filename, mode, FileAccess.Write, FileShare.Read, 1 /*BufferSize*/); } } catch (Exception exception) { CurrentAppender.ErrorHandler.Error("Unable to acquire lock on file " + filename + ". " + exception.Message); } } public override void ReleaseLock() { } } </code></pre>

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