Logzio.DotNet.Log4net 1.2.0

Logz.io log4net Appender

• Configuration
  • XML
  • Code
• Custom Fields
• Extensibility
• Trace Context
• Code Samples

Install the log4net appender from the Package Manager Console:

Install-Package Logzio.DotNet.Log4net

If you prefer to install the library manually, download the latest version from the releases page.

Configuration

XML

If you configure your logging in an XML file, simply add a reference to the Logz.io appender.

<log4net>
    <appender name="LogzioAppender" type="Logzio.DotNet.Log4net.LogzioAppender, Logzio.DotNet.Log4net">
    	
	
	<token><<LOG-SHIPPING-TOKEN>></token>
			
	
	
    	<type>log4net</type>
	
    	<listenerUrl>https://<<LISTENER-HOST>>:8071</listenerUrl>
        
	
    	<bufferSize>100</bufferSize>
	
    	<bufferTimeout>00:00:05</bufferTimeout>
	
    	<retriesMaxAttempts>3</retriesMaxAttempts>
    	
	<retriesInterval>00:00:02</retriesInterval>
	
	<gzip>true</gzip>
	
	
	
	<debug>false</debug>
	
	<debugLogFile>my_absolute_path_to_file</debugLogFile>		
	
	<jsonKeysCamelCase>false</jsonKeysCamelCase>
	
	<addTraceContext>false</addTraceContext>
    
	<UseStaticHttpClient>false</UseStaticHttpClient>

    </appender>
    
    <root>
    	<level value="INFO" />
    	<appender-ref ref="LogzioAppender" />
    </root>
</log4net>

Add a reference to the configuration file in your code, as shown in the example here.

Code

To add the Logz.io appender via code, add the following lines:

var hierarchy = (Hierarchy)LogManager.GetRepository();
var logzioAppender = new LogzioAppender();
logzioAppender.AddToken("<<LOG-SHIPPING-TOKEN>>");
logzioAppender.AddListenerUrl("<<LISTENER-HOST>>");
// <-- Uncomment and edit this line to enable proxy routing: --> 
// logzioAppender.AddProxyAddress("http://your.proxy.com:port");
// <-- Uncomment this to enable sending logs in Json format -->  
// logzioAppender.ParseJsonMessage(true);
// <-- Uncomment these lines to enable gzip compression --> 
// logzioAppender.AddGzip(true);
// logzioAppender.ActivateOptions();
// logzioAppender.JsonKeysCamelCase(false);
// logzioAppender.AddTraceContext(false);
// logzioAppender.AddDebug(false);
// logzioAppender.AddDebugLogFile("my_absolute_path_to_file");
// logzioAppender.UseStaticHttpClient(false);
logzioAppender.ActivateOptions();
hierarchy.Root.AddAppender(logzioAppender);
hierarchy.Root.Level = Level.All;
hierarchy.Configured = true;

Custom Fields

You can add static keys and values to be added to all log messages. For example:

<appender name="LogzioAppender" type="Logzio.DotNet.Log4net.LogzioAppender, Logzio.DotNet.Log4net">
    <customField>
	<key>Environment</key>
	<value>Production</value>
    </customField>
    <customField>
	<key>Location</key>
	<value>New Jerseay B1</value>
    </customField>
</appender>

Extensibility

If you want to change some of the fields or add some of your own, inherit the appender and override the ExtendValues method:

public class MyAppLogzioAppender : LogzioAppender
{
    protected override void ExtendValues(LoggingEvent loggingEvent, Dictionary<string, string> values)
    {
	values["logger"] = "MyPrefix." + values["logger"];
	values["myAppClientId"] = new ClientIdProvider().Get();
    }
}

You will then have to change your configuration in order to use your own appender.

Trace Context

WARNING: Does not support .NET Standard 1.3

If you’re sending traces with OpenTelemetry instrumentation (auto or manual), you can correlate your logs with the trace context. In this way, your logs will have traces data in it: span id and trace id. To enable this feature, set <addTraceContext>true</addTraceContext> in your configuration or logzioAppender.AddTraceContext(true); in your code (as shown in the previews sections).

Code Samples

XML

using System.IO;
using log4net;
using log4net.Config;
using System.Reflection;

namespace dotnet_log4net
{
    class Program
    {
        static void Main(string[] args)
        {
            var logger = LogManager.GetLogger(typeof(Program));
            var logRepository = LogManager.GetRepository(Assembly.GetEntryAssembly());

            // Replace "App.config" with the config file that holds your log4net configuration
            XmlConfigurator.Configure(logRepository, new FileInfo("App.config"));

            logger.Info("Now I don't blame him 'cause he run and hid");
            logger.Info("But the meanest thing he ever did");
            logger.Info("Before he left was he went and named me Sue");

            LogManager.Shutdown();
        }
    }
}

Code

using log4net;
using log4net.Core;
using log4net.Repository.Hierarchy;
using Logzio.DotNet.Log4net;

namespace dotnet_log4net
{
    class Program
    {
        static void Main(string[] args)
        {
            var hierarchy = (Hierarchy)LogManager.GetRepository();
            var logger = LogManager.GetLogger(typeof(Program));
            var logzioAppender = new LogzioAppender();
            
            logzioAppender.AddToken("<<LOG-SHIPPING-TOKEN>>");
            logzioAppender.AddListenerUrl("https://<<LISTENER-HOST>>:8071");
            // <-- Uncomment and edit this line to enable proxy routing: --> 
            // logzioAppender.AddProxyAddress("http://your.proxy.com:port");
            // <-- Uncomment this to enable sending logs in Json format -->  
            // logzioAppender.ParseJsonMessage(true);
            // <-- Uncomment these lines to enable gzip compression --> 
            // logzioAppender.AddGzip(true);
            // logzioAppender.ActivateOptions();
            // logzioAppender.JsonKeysCamelCase(false)
            // logzioAppender.AddTraceContext(false);
            // logzioAppender.AddDebug(false);
            // logzioAppender.AddDebugLogFile("my_absolute_path_to_file");
            // logzioAppender.UseStaticHttpClient(false);
            logzioAppender.ActivateOptions();
            
            hierarchy.Root.AddAppender(logzioAppender);
            hierarchy.Configured = true;
            hierarchy.Root.Level = Level.All;

            logger.Info("Now I don't blame him 'cause he run and hid");
            logger.Info("But the meanest thing he ever did");
            logger.Info("Before he left was he went and named me Sue");

            LogManager.Shutdown();
        }
    }
}

Serverless platforms

If you’re using a serverless function, you’ll need to call the appender's flush method at the end of the function run to make sure the logs are sent before the function finishes its execution. You’ll also need to create a static appender in the Startup.cs file so each invocation will use the same appender. The appender should have the UseStaticHttpClient flag set to true.

Azure serverless function code sample

Startup.cs

using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using log4net;
using log4net.Repository.Hierarchy;
using Logzio.DotNet.Log4net;

[assembly: FunctionsStartup(typeof(LogzioLog4NetSampleApplication.Startup))]

namespace LogzioLog4NetSampleApplication
{
    public class Startup : FunctionsStartup
    {
        public override void Configure(IFunctionsHostBuilder builder)
        {
            var hierarchy = (Hierarchy)LogManager.GetRepository();
            var logzioAppender = new LogzioAppender();
            logzioAppender.AddToken("<<LOG-SHIPPING-TOKEN>>");
            logzioAppender.AddListenerUrl("https://<<LISTENER-HOST>>:8071");
            logzioAppender.ActivateOptions();
            logzioAppender.UseStaticHttpClient(true);
            hierarchy.Root.AddAppender(logzioAppender);
            hierarchy.Configured = true;
        }
    }
}

FunctionApp.cs

using System;
using Microsoft.Azure.WebJobs;
using Microsoft.Extensions.Logging;
using log4net;
using MicrosoftLogger = Microsoft.Extensions.Logging.ILogger;

namespace LogzioLog4NetSampleApplication
{
    public class TimerTriggerCSharpLog4Net
    {
        
        private static readonly ILog logger = LogManager.GetLogger(typeof(TimerTriggerCSharpLog4Net));

        [FunctionName("TimerTriggerCSharpLog4Net")]
        public void Run([TimerTrigger("*/30 * * * * *")]TimerInfo myTimer, MicrosoftLogger msLog)
        {
            msLog.LogInformation($"Log4Net C# Timer trigger function executed at: {DateTime.Now}");

            logger.Info("Now I don't blame him 'cause he run and hid");
            logger.Info("But the meanest thing he ever did");
            logger.Info("Before he left was he went and named me Sue");
            LogManager.Flush(5000);

            msLog.LogInformation($"Log4Net C# Timer trigger function finished at: {DateTime.Now}");
        }
    }
}