NLog.Etw

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NLog Target for Event Tracing for Windows (ETW)

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# NLog.Etw

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NLog Target for writing logevents to Event Tracing for Windows (ETW).

## Install nuget-package to your project:

> dotnet add package NLog.Etw

## Example NLog.config file

Example of `NLog.config`-file that writes to ETW:

```xml
<?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">

<targets async="true">
        <target type="EtwEventSource"
                name="eetw"
                providerName="MyEventSourceName"
                taskName="${level}"
                layout="${message}"
              />
    </targets>
    
    <rules>
      <logger name="*" minlevel="Trace" writeTo="eetw" />
    </rules>
</nlog>
```

## Example Custome EventSource

Example of providing own custom EventSource for writing events:

```c#
[EventSource(Name = "MyEventSourceName")]
public class MyEventSource : EventSource, NLog.Etw.INLogEventSource
{
    /// <inheritdoc/>
    [NonEvent]
    public void Write(EventLevel eventLevel, string layoutMessage, LogEventInfo logEvent)
    {
        // TODO Call own custom logging-method
    }

/// <inheritdoc/>
    EventSource EventSource { get { return this; } }

internal readonly static MyEventSource Log = new MyEventSource();
}

var config = new NLog.Config.LoggingConfiguration();
config.AddRuleForAllLevels(new NLog.Etw.NLogEtwExtendedTarget(MyEventSource.Log) { Name = "eetw" });
NLog.LogManager.Configuration = config;
```

### Example with EtwEventCounter Target

Example of `NLog.config`-file that writes to ETW-EventCounter:

```xml
<?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">

<targets async="true">
        <target type="EtwEventCounter"
                name="etwCounter"
                providerName="MyEventSourceName"
                counterName="MyEventCounterName"
                metricValue="${event-properties:MyMetricValue:whenEmpty=1}"
              />
    </targets>
    
    <rules>
      <logger name="*" minlevel="Trace" writeTo="etwCounter" />
    </rules>
</nlog>
```

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