Nuget

A NuGet-package is available here.

NlogViewer

NlogViewer is a ui control library to visualize NLog logs in your personal application. It is mainly based on Sentinel and its controls.

supported Framework: .NET6

Quick Start

Add a namespace to your Window

xmlns:dj="clr-namespace:DJ;assembly=NLogViewer"

use the control

<dj:NLogViewer/>

NlogViewer is subscribing to CacheTarget. By default, the NlogViewer is automatically creating a CacheTarget with loggingPattern "*" and LogLevel "Trace".

If you want to customize the loggingPattern and LogLevel, add the following to your Nlog.config.

<?xml version="1.0" encoding="utf-8" ?>
<nlog 
  xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.nlog-project.org/schemas/NLog.xsd NLog.xsd"
  autoReload="true">

  <extensions> 
    <add assembly="NLogViewer"/> 
  </extensions> 

  <targets async="true">
    <target
      xsi:type="CacheTarget"
      name="cache"/>
  </targets>

  <rules>
    <logger name="*" writeTo="cache" minlevel="Debug"/> 
  </rules>
</nlog>

Customize

Colors

Customize foreground or background of every logLevel

Multi targeting

Use more than one instance of NLogViewer to match different rules.

Create 2 targets with their own rules.

<targets async="true">
  <target xsi:type="CacheTarget" name="target1"/>
  <target xsi:type="CacheTarget" name="target2"/>
</targets>

<rules>
  <logger name="*" writeTo="target1" maxlevel="Info"/> 
  <logger name="*" writeTo="target2" minlevel="Warn"/> 
</rules>

Set TargetName property to link them.

<dj:NLogViewer TargetName="target1"/>
<dj:NLogViewer TargetName="target2"/>

Format output (ILogEventInfoResolver)

To format the output of a LogEventInfo, implement a new instance of ILogEventInfoResolver and bind it to the Resolver you want to customize:

/// <summary>
/// Reformat the DateTime
/// </summary>
public class FooTimeStampResolver : ILogEventInfoResolver
{
    public string Resolve(LogEventInfo logEventInfo)
    {
        return logEventInfo.TimeStamp.ToUniversalTime().ToString();
    }
}

NLogViewer1.TimeStampResolver = new FooTimeStampResolver();

Samples

open on a new window

Create a new Window and add a default NLogViewer

<dj:NLogViewer TargetName="target1"/>

Open the new Window

TestPopup popup = new TestPopup();
popup.Show();

seperate logger for a task

Below is a sample how you could create a NLogViewer for a task

// create unique target name
var taskNumber = _RandomTaskCounter++;
string targetName = $"task{taskNumber}";
// create a unique logger
var loggerName = $"MyFoo.Logger.{taskNumber}";
var logger = LogManager.GetLogger(loggerName);

// create new CacheTarget
CacheTarget target = new CacheTarget
{
    Name = targetName
};

// get config // https://stackoverflow.com/a/3603571/6229375
var config = LogManager.Configuration;

// add target
config.AddTarget(targetName, target);

// create a logging rule for the new logger
LoggingRule loggingRule = new LoggingRule(loggerName, LogLevel.Trace, target);

// add the logger to the existing configuration
config.LoggingRules.Add(loggingRule);

// reassign config back to NLog
LogManager.Configuration = config;

// create a new NLogViewer Control with the unique logger target name
NLogViewer nLogViewer = new NLogViewer
{
    TargetName = targetName,
};

// add it to the tab control
var tabItem = new TabItem { Header = $"Task {taskNumber}", Content = nLogViewer };
TabControl1.Items.Add(tabItem);
TabControl1.SelectedItem = tabItem;

// create task which produces some output
var task = new Task(async () =>
{
    while (true)
    {
        logger.Info($"Hello from task nr. {taskNumber}. It's {DateTime.Now.ToLongTimeString()}");
        await Task.Delay(1000);
    }
});

Why CacheTarget?

There is already a NLogViewerTarget, which is used for Sentinel. See here

<target 
    xsi:type="NLogViewer"
    name="sentinel"
    address="udp://127.0.0.1:9999"/>

Contributors

Feel free to make a PullRequest or open an Issue to extend this library!