How can I log events to the event viewer in an asp net core web api


events is an essential part of any application process. It helps to track and analyze the behavior of applications, identify issues, and make informed decisions. In this article, we will explore how to log events to the event viewer in an ASP.NET Core Web API.


ASP.NET Core provides a built-in logging framework that allows developers to log events easily. The ILogger interface is the main component of this framework, which provides methods for logging events at different levels such as , Warning, Error, etc.

To log events to the event viewer, we need to configure the ILogger to use the EventLog provider. Let's see an example:

using Microsoft.Extensions.Logging;
using System;

namespace YourNamespace
    public  YourController : ControllerBase
        private readonly ILogger _logger;

        public YourController(ILogger logger)
            _logger = logger;

        public IActionResult YourAction()
            _logger.LogInformation("This is an information message.");
            _logger.LogWarning("This is a warning message.");
            _logger.LogError("This is an error message.");

            return Ok();

In the above example, we inject the ILogger into our controller and use it to log events. The LogInformation, LogWarning, and LogError methods are used to log events at different levels. These events will be to the event viewer.

Configuring EventLog Provider

To configure the EventLog provider, we need to the appsettings.json file. Add the following configuration:

"Logging": {
  "LogLevel": {
    "Default": "Information",
    "Microsoft": "Warning",
    "Microsoft.Hosting.Lifetime": "Information"
  "EventLog": {
    "SourceName": "YourApplicationName",
    "LogName": "YourLogName"

In the above configuration, we set the default log level to Information and specify the source name and log name for the EventLog provider. Make sure to replace “YourApplicationName” and “YourLogName” with appropriate values.

Registering EventLog Provider

Next, we need to register the EventLog provider in the ConfigureServices method of the Startup class. Add the following code:

public void ConfigureServices(IServiceCollection services)
    services.AddLogging(logging =>

The AddLogging method is used to register the logging services, and the AddEventLog method is used to add the EventLog provider.


In this article, we have learned how to log events to the event viewer in an ASP.NET Core Web API. By using the ILogger interface and configuring the EventLog provider, developers can easily log events at different levels and analyze the behavior of their applications. Logging events to the event viewer is a crucial step in ensuring the reliability and of your ASP.NET Core Web API.

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