Tuesday, April 03, 2012

Log4Net Configuration trouble

Recently i had some log4net configuration trouble

log4net has a feature in its configuration file where it tries to read Configuration name tags from the config file and locates them as writable properties on the class (Logger/Appender etc..) using reflection.

the function used is

protected void log4net.Repository.Hierarchy.XmlHierarchyConfigurator.SetParameter(XmlElementelement,objecttarget)
this function locates the property for you and updates its data if it finds it if not it fills your screen and logs with garbage until its fixed!
It will even locate the property if you write it in the wrong case.
However, it does not help you in locating your error. I do not expect log4net developers to write a “google-style” {did you mean xxx} function. But I think they could have a better log response
instead of a bland
LogLog.Error(declaringType, "XmlHierarchyConfigurator: Cannot find Property [" + name + "] to set object on [" + target.ToString() + "]");


It would be nicer (I think) to write something like

LogLog.Error(declaringType,
string.Format(
"{2}Reflection did not find Writeable Property/Field named [{0}]. Check ObjectBrowser for class {1} and see what writable attributes/fields exist. maybe misspelled? You XML Error is located in {3}"
, name, target.ToString(), "XmlHierarchyConfigurator", element.ParentNode.InnerXml)
);

which would give something like

XmlHierarchyConfiguratorReflection did not find Writeable Property/Field named [hello]. Check ObjectBrowser for object log4net.Repository.Hierarchy.DefaultLoggerFactory+LoggerImpl and see what writable attributes/fields exist. maybe misspelled? You XML Error is located in <level value=\"Info\" /><hello value=\"4\" /><appender-ref ref=\"LogFileAppender\" /><appender-ref ref=\"RSLogFileAppenderInfo\" /><appender-ref ref=\"RSLogFileAppenderFatal\" />"


for the error of adding the field “hello” to the XML.


This is at the very least a more helpful comment.


At least now I know what to look for. any attribute in log4nt configuration must have a real writeable field/property in the log4net object hierarchy.


good to know.


 


Mickey Perlstein

Preview Pane : Windows 7

 

forgot all about this one

taken from http://www.winvistaclub.com/t81.html

But, if you have a custom file type; and wish to register a plain text or a multimedia preview handler, for this custom file type, you can do so using this utility.

Winhelponline’s PreviewConfig Utility allows you add or remove preview handler for a file type. Its a very useful and a easy-to-use utility. Worth a check-out. Do read its ReadMe file first.