[](https://codecov.io/github/Microsoft/ApplicationInsights-dotnet-logging?branch=develop)
## Nuget packages
- For ILogger:
[Microsoft.Extensions.Logging.ApplicationInsights](https://www.nuget.org/packages/Microsoft.Extensions.Logging.ApplicationInsights/)
[](https://www.nuget.org/packages/Microsoft.Extensions.Logging.ApplicationInsights/)
- For NLog:
[Microsoft.ApplicationInsights.NLogTarget](http://www.nuget.org/packages/Microsoft.ApplicationInsights.NLogTarget/)
[](https://www.nuget.org/packages/Microsoft.ApplicationInsights.NLogTarget/)
- For Log4Net: [Microsoft.ApplicationInsights.Log4NetAppender](http://www.nuget.org/packages/Microsoft.ApplicationInsights.Log4NetAppender/)
[](https://www.nuget.org/packages/Microsoft.ApplicationInsights.Log4NetAppender/)
- For System.Diagnostics: [Microsoft.ApplicationInsights.TraceListener](http://www.nuget.org/packages/Microsoft.ApplicationInsights.TraceListener/)
[](https://www.nuget.org/packages/Microsoft.ApplicationInsights.TraceListener/)
- [Microsoft.ApplicationInsights.DiagnosticSourceListener](http://www.nuget.org/packages/Microsoft.ApplicationInsights.DiagnosticSourceListener/)
[](https://www.nuget.org/packages/Microsoft.ApplicationInsights.DiagnosticSourceListener/)
- [Microsoft.ApplicationInsights.EtwCollector](http://www.nuget.org/packages/Microsoft.ApplicationInsights.EtwCollector/)
[](https://www.nuget.org/packages/Microsoft.ApplicationInsights.EtwCollector/)
- [Microsoft.ApplicationInsights.EventSourceListener](http://www.nuget.org/packages/Microsoft.ApplicationInsights.EventSourceListener/)
[](https://www.nuget.org/packages/Microsoft.ApplicationInsights.EventSourceListener/)
Application Insights logging adapters.
==============================
If you use NLog, log4Net or System.Diagnostics.Trace for diagnostic tracing in your application, you can have your logs sent to Application Insights, where you can explore and search them. Your logs will be merged with the other telemetry coming from your application, so that you can identify the traces associated with servicing each user request, and correlate them with other events and exception reports.
Read more:
- [Microsoft Docs: "Explore .NET trace logs in Application Insights"](https://docs.microsoft.com/azure/application-insights/app-insights-asp-net-trace-logs)
- [Microsoft Docs: "Diagnose sudden changes in your app telemetry"](https://docs.microsoft.com/azure/application-insights/app-insights-analytics-diagnostics#trace)
## ILogger
See [this](https://github.com/Microsoft/ApplicationInsights-dotnet-logging/tree/develop/src/ILogger/Readme.md).
## NLog
Application Insights NLog Target nuget package adds ApplicationInsights target in your web.config.
If your application does not have web.config then it can also be configured manually.
* **Configure ApplicationInsightsTarget using NLog.config** :
```xml
Your_Resource_Key
```
```csharp
// You need this only if you did not define InstrumentationKey in ApplicationInsights.config (Or in the NLog.config)
TelemetryConfiguration.Active.InstrumentationKey = "Your_Resource_Key";
Logger logger = LogManager.GetLogger("Example");
logger.Trace("trace log message");
```
* **Configure ApplicationInsightsTarget using NLog Config API** :
If you configure NLog programmatically with the [NLog Config API](https://github.com/nlog/NLog/wiki/Configuration-API), then create Application Insights target in code and add it to your other targets:
```csharp
var config = new LoggingConfiguration();
ApplicationInsightsTarget target = new ApplicationInsightsTarget();
// You need this only if you did not define InstrumentationKey in ApplicationInsights.config or want to use different instrumentation key
target.InstrumentationKey = "Your_Resource_Key";
LoggingRule rule = new LoggingRule("*", LogLevel.Trace, target);
config.LoggingRules.Add(rule);
LogManager.Configuration = config;
Logger logger = LogManager.GetLogger("Example");
logger.Trace("trace log message");
```
## Log4Net
Application Insights Log4Net adapter nuget modifies web.config and adds Application Insights Appender.
For more information, see [Log4Net Configuration](https://logging.apache.org/log4net/release/manual/configuration.html)
```csharp
// You do not need this if you have instrumentation key in the ApplicationInsights.config
TelemetryConfiguration.Active.InstrumentationKey = "Your_Resource_Key";
log4net.Config.XmlConfigurator.Configure();
var logger = LogManager.GetLogger(this.GetType());
logger.Info("Message");
logger.Warn("A warning message");
logger.Error("An error message");
```
## System.Diagnostics
Microsoft.ApplicationInsights.TraceListener nuget package modifies web.config and adds application insights listener.
For more information, see ["Microsoft Docs: "Tracing and Instrumenting Applications"](https://docs.microsoft.com/dotnet/framework/debug-trace-profile/tracing-and-instrumenting-applications)
```xml
```
If your application type does not have web.config, add listener programmatically or in the configuration file appropriate to your application type
```csharp
// You do not need this if you have instrumentation key in the ApplicationInsights.config
TelemetryConfiguration.Active.InstrumentationKey = "Your_Resource_Key";
System.Diagnostics.Trace.TraceWarning("Slow response - database01");
```
## EventSource
`EventSourceTelemetryModule` allows you to configure EventSource events to be sent to Application Insights as traces.
For more information, see [Microsoft Docs: "Using EventSource Events"](https://docs.microsoft.com/azure/application-insights/app-insights-asp-net-trace-logs#using-eventsource-events).
## ETW
`EtwCollectorTelemetryModule` allows you to configure events from ETW providers to be sent to Application Insights as traces.
For more information, see [Microsoft Docs: "Using ETW Events"](https://docs.microsoft.com/azure/application-insights/app-insights-asp-net-trace-logs#using-etw-events).
## DiagnosticSource
You can configure `System.Diagnostics.DiagnosticSource` events to be sent to Application Insights as traces.
For more information, see [CoreFX: "Diagnostic Source Users Guide"](https://github.com/dotnet/corefx/blob/master/src/System.Diagnostics.DiagnosticSource/src/DiagnosticSourceUsersGuide.md).
To enable, edit the `TelemetryModules` section of the ApplicationInsights.config file:
```xml
```