Enterprise Library Logging

Logger code

Log4net handles logging info/ warning/ error type messages simple, but Enterprise Library Logging Application Block isn't so obvious. Here's a simple facade I use. See also my no-configuration log loader.

using System.Diagnostics;
using Microsoft.Practices.EnterpriseLibrary.Logging;

namespace EntLib5Logging
{
    /// <summary>
    /// Facade for writing log entries in log4net style to EntLib Logging
    /// </summary>
    public static class Log
    {
        /*
         * We don't use priority or eventId
         * We get the calling method from the stackFrame (careful with inlining here)
         */
        private static string GetCallingMethod(StackFrame frame)
        {
            //don't calculate this if we aren't logging
            if (!Logger.IsLoggingEnabled()) return string.Empty;
            var method = frame.GetMethod();
            return method.DeclaringType.FullName + "." + method.Name;
        }

        /// <summary>
        /// Logs an informational message
        /// </summary>
        /// <param name="message">The message.</param>
        public static void Info(string message)
        {
            var category = GetCallingMethod(new StackFrame(1));
            Logger.Write(message, category, 0, 0, TraceEventType.Information);
        }

        /// <summary>
        /// Logs a warning message
        /// </summary>
        /// <param name="message">The message.</param>
        public static void Warn(string message)
        {
            var category = GetCallingMethod(new StackFrame(1));
            Logger.Write(message, category, 0, 0, TraceEventType.Warning);
        }

        /// <summary>
        /// Logs an error message
        /// </summary>
        /// <param name="message">The message.</param>
        public static void Error(string message)
        {
            var category = GetCallingMethod(new StackFrame(1));
            Logger.Write(message, category, 0, 0, TraceEventType.Error);
        }
    }
}

Configuration

99% of the time I use a simple text log files, and I want to switch between logging everything and logging just errors. This is EntLib 5- EntLib 4 was exactly the same (if you change the EntLib version number to 4.1.0.0). Here's the copy to paste...

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" />
    </configSections>
    <loggingConfiguration name="" tracingEnabled="true" defaultCategory="General">
        <listeners>
            <add name="Error Trace Listener"
                 type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
                listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
                fileName="errors.log"
                formatter="Simple Text Formatter"
                header=""
                footer=""
                filter="Error" />
            <add name="Full Trace Listener"
                 type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
                listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
                fileName="full.log"
                rollFileExistsBehavior="Increment"
                rollInterval="Day"
                header=""
                footer=""
                formatter="Simple Text Formatter" />
        </listeners>
        <formatters>
            <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
                template="{timestamp}{tab}{category}{tab}{message}"
                name="Simple Text Formatter" />
        </formatters>
        <categorySources>
        </categorySources>
        <specialSources>
            <allEvents switchValue="All" name="All Events">
                <listeners>
                    <add name="Full Trace Listener" />
                    <add name="Error Trace Listener" />
                </listeners>
            </allEvents>
            <notProcessed switchValue="All" name="Unprocessed Category" />
            <errors switchValue="All" name="Logging Errors & Warnings">
                <listeners>
                    <add name="Error Trace Listener" />
                </listeners>
            </errors>
        </specialSources>
    </loggingConfiguration>
</configuration>

Switching configuration - full to just errors

There are different ways to do this, so this is just the way I found works for me.
There are two listeners, for the error file and the full file. The error listener has a filter="Error" on it so it only writes errors. specialSources / allEvents just sends everything (switchValue="All") through to both listeners. To switch to error-only logging, just delete the full trace listener and (optionally as we already do this in the listener) change to allEvents switchValue="Error".