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https://issues.apache.org/jira/browse/LOG4NET-306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13095859#comment-13095859
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Jon Abaunza commented on LOG4NET-306:
-------------------------------------
Thanks for answering Curt,
I didn't realize of the existance of this method. It won' t allow me making
several layers to wrap log4Net but I can work around that.
Thanks
> Allowing the MethodLocationPatternConverter to skip certain methods from the
> call stack when trying to log the caller method (Solution for Log4Net
> wrappers)
> ------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LOG4NET-306
> URL: https://issues.apache.org/jira/browse/LOG4NET-306
> Project: Log4net
> Issue Type: New Feature
> Components: Other
> Affects Versions: 1.2.9, 1.2.10
> Reporter: Jon Abaunza
> Priority: Blocker
>
> There are several environments where it is required to develop a wrapper
> around Log4Net for backward compatibility with previous logging systems.
> The problem comes when it is required to obtain the method name. The system
> goes up in the StackTrace and identifies the wrapper method as the first user
> method and therefore logs the name of the wrapper instead of the real caller
> method.
> The solution would be as simple as creating a new MethodAtribute (lets say
> log4Net.SkipMethodForMethodLocation). I would be able to decorate my method
> with it and the MethodLocationPatternConverter would continue looking up in
> the stackTrace for the next user method.
> Modifications made (just modified the constructor)
> LocationInfo.cs
> public class LocationInfo
> {
> /// <summary>
> /// Constructor
> /// </summary>
> /// <param name="callerStackBoundaryDeclaringType">The declaring type
> of the method that is
> /// the stack boundary into the logging system for this call.</param>
> /// <remarks>
> /// <para>
> /// Initializes a new instance of the <see cref="LocationInfo" />
> /// class based on the current thread.
> /// </para>
> /// </remarks>
> public LocationInfo(Type callerStackBoundaryDeclaringType)
> {
> // Initialize all fields
> m_className = NA;
> m_fileName = NA;
> m_lineNumber = NA;
> m_methodName = NA;
> m_fullInfo = NA;
> m_assembly = NA;
> #if !NETCF
> if (callerStackBoundaryDeclaringType != null)
> {
> try
> {
> StackTrace st = new StackTrace(true);
> int frameIndex = 0;
> // skip frames not from fqnOfCallingClass
> while (frameIndex < st.FrameCount)
> {
> StackFrame frame =
> st.GetFrame(frameIndex);
> if (frame != null &&
> frame.GetMethod().DeclaringType == callerStackBoundaryDeclaringType)
> {
> break;
> }
> frameIndex++;
> }
> // skip frames from fqnOfCallingClass
> while (frameIndex < st.FrameCount)
> {
> StackFrame frame =
> st.GetFrame(frameIndex);
> if (frame != null &&
> frame.GetMethod().DeclaringType != callerStackBoundaryDeclaringType)
> {
> break;
> }
> frameIndex++;
> }
> while (frameIndex < st.FrameCount)
> {
> // now frameIndex is the first
> 'user' caller frame
> StackFrame locationFrame =
> st.GetFrame(frameIndex);
> if (locationFrame != null)
> {
> System.Reflection.MethodBase
> method = locationFrame.GetMethod();
>
> if (method != null)
> {
> bool skip = false;
>
> //NEW CHANGES:
>
> //We look for the new Custom attribute
> SkipMethodInMethodLocationAttribute
>
> //if the method is decorated with the
> attribute we will continue looking up in the stack
> object[]
> customAttributes =
> method.GetCustomAttributes(typeof(SkipMethodInMethodLocationAttribute),
> false);
> foreach (object
> customAttribute in customAttributes)
> {
>
> SkipMethodInMethodLocationAttribute skipMethodAttribute = customAttribute as
> SkipMethodInMethodLocationAttribute;
> if
> (skipMethodAttribute != null)
> {
> skip =
> skipMethodAttribute.Skip;
> }
> }
> //If the method was
> decorated with the attribute we continue looking up in the stack
> if (!skip)
> {
> m_methodName =
> method.Name;
> if
> (method.DeclaringType != null)
> {
>
> m_className = method.DeclaringType.FullName;
> }
> m_assembly =
> method.Module.Assembly.FullName;
> m_fileName =
> locationFrame.GetFileName();
> m_lineNumber =
> locationFrame.GetFileLineNumber().ToString(System.Globalization.NumberFormatInfo.InvariantInfo);
> // Combine all
> location info
> m_fullInfo =
> m_className + '.' + m_methodName + '(' + m_fileName + ':' + m_lineNumber +
> ')';
> break;
> }
> }
>
> }
> frameIndex++;
> }
> }
> catch(System.Security.SecurityException)
> {
> // This security exception will occur if the
> caller does not have
> // some undefined set of SecurityPermission
> flags.
> LogLog.Debug("LocationInfo: Security exception
> while trying to get caller stack frame. Error Ignored. Location Information
> Not Available.");
> }
> }
> #endif
> }
> //.................End of modifications...............//
> }
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