CODEWITHSUNDEEP
c#log4netslf4net
Johan P
Johan P

Reputation: 111

How to access all entries in MDC dictionarry?

for the sake of having kind of the same setup in Java and C# (i know, terrible reason), I got this setup running in Java:

log4j:

<appender name="ELASTIC" class="ch.qos.logback.core.FileAppender">
    ...
    <encoder class="ch.qos.logback.core.encoder.LayoutWrappingEncoder">
        <layout class="FileBeatLayout" />
    </encoder>
</appender>

Some information logging into MDC

MDC.Set("testIssue", testIssue.Replace("#", "-"));
MDC.Set("testType", testType);
MDC.Set("method", method.Name.ToLower());
MDC.Set("elapsedTime", elapsedTimeInNs.ToString());
MDC.Set("elapsedTimeUnit", "ns");
MDC.Set("platform", ".NET");
MDC.Set("platformVersion", Environment.Version.ToString());
MDC.Set("operatingSystem", $"{GetBaseOs()} {Environment.OSVersion.Version.Major}");
MDC.Set("jenkinsBuild", GetJenkinsBuildTagIfSet());

foreach (var version in testEnvironment.GetDependencyTreeDict())
{
    MDC.Set(version.Key, version.Value);
}
                
_logger.Info("[{0}] *{1}* {2}: {3} ns", testIssue, testType, method.Name, elapsedTimeInNs);
log4net.ThreadContext.Properties["TIMING"] = "false";
MDC.Clear();

Finaly a custom Layout class writing the content of the MDC to the file as one json string per logging event. (Java)

public class FileBeatLayout extends LayoutBase<ILoggingEvent> {
@Override
public String doLayout(ILoggingEvent iLoggingEvent) {
    StringBuilder stringBuilder = new StringBuilder();
    Map<String, String> map = iLoggingEvent.getMDCPropertyMap();
    JSONObject jsonObject = new JSONObject(map);
    stringBuilder.append(jsonObject);
    return stringBuilder.toString().replaceAll("[\\t \\n]", "") + "\n";
}

}

how do I do iterate over all values in MDC in C#, as in slf4net, this functionality is internal? I got this far (and this works insofar that it will write out that string for each event)

public class FileBeatLayout :  LayoutSkeleton
{
    public override void ActivateOptions()
    {
        
    }

    public override void Format(TextWriter writer, LoggingEvent loggingEvent)
    {
        writer.WriteLine("The JSON object containing all MDC values");
    }
}

Upvotes: 1

Views: 648

Answers (1)

Johan P
Johan P

Reputation: 111

Found out myself after rubber ducking stackoverflow:

ThreadContext.Properties.GetKeys().ForEach(x => jsonObject.Add(x, ThreadContext.Properties[x]));

This seems to be the way to access whatever you write to MDC.

Upvotes: 1

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