log4net - Exception renderer
June 12th, 2009If you use log4net you have probably noticed that this logger does not write information from exception's "Data" property. Here is the renderer which does:
C#:
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text;
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using log4net.ObjectRenderer;
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namespace SomeNamespace
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{
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public class ExceptionRenderer : IObjectRenderer
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{
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#region IObjectRenderer Members
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public void RenderObject(RendererMap rendererMap, object obj, TextWriter writer)
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{
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if (rendererMap == null)
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{
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}
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if (obj == null)
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{
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}
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if (writer == null)
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{
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}
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{
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Exception ex = (Exception)obj;
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writer.WriteLine(ex.ToString());
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if (ex.Data.Count> 0)
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{
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writer.WriteLine("Exception Data:");
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}
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foreach (string key in ex.Data.Keys)
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{
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writer.WriteLine("\t {0} = {1}", key, rendererMap.FindAndRender(ex.Data[key]));
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}
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}
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else
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{
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throw new InvalidOperationException(string.Format("Object of type {0} cannot be rendered with ExceptionRenderer", obj.GetType()));
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}
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}
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#endregion
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}
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}
and the configuration needed for this to work is:
XML:
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<log4net>
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...
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<renderer renderingClass="SomeNamespace.ExceptionRenderer" renderedClass="System.Exception" />
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...
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</log4net>
Sample output for NullReferenceException with Data["configPath"] = "myconfig.config":
2009-06-12 22:22:04,038 INFO [LoggerTest.Program] - Exception during init
System.NullReferenceException: Something was null
at LoggerTest.Program.Main(String[] args) in G:\C#\Temp\LoggerTest\Program.cs:line 26
Exception Data:
configPath = myconfig.config
Feel free to use and modify it.
