Easy log with asp.net core: Serilog

It is well known why logging is a key point in the development of an application. It is also useless to say how non-sense it is today to develop a custom framework that does this: there are a thousand plugins that do it (and often very well) so you are truly spoiled for choice. However, not all of them are easy to set up (some are a real nightmare). My choice is SeriLog. You can find a lot of documentation on the subject on the web, I suggest a couple of them below at the bottom of the post.

Specifically, these are the actions I carried out to install and configure it:

  • Download from NuGet Packages Manager the package Serilog.AspNetCore
  • Initialize the Logger within Program.cs
var logger = new LoggerConfiguration()

  • Add in the file appsettings.js the write configurations, like the name of the file, where it is located etc…
"Serilog": {
  "Using": [ "Serilog.Sinks.File" ],
  "MinimumLevel": {
    "Default": "Information"
  "WriteTo": [
      "Name": "File",
      "Args": {
        "path": "../APIlogs/webapi-WebAPICoreAuthBearer.log",
        "rollingInterval": "Day",
        "outputTemplate": "[{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} {CorrelationId} {Level:u3}] {Username} {Message:lj}{NewLine}{Exception}"

With these simple actions your system will be already able to log. If you need to explicitly log into your controllers in the case of an API, of course, just use the usual “injective” mode.

 private readonly ILogger<InfoAPIController> _logger;
 private readonly IConfiguration _configuration;

 public InfoAPIController(ILogger<InfoAPIController> logger, IConfiguration iConfig)
     _logger = logger;
     _configuration = iConfig;

 [HttpGet(Name = "GetInfo")] ]
 public InfoAPI Get()
     _logger.Log(LogLevel.Information, "GetInfo");

[1] https://www.claudiobernasconi.ch/2022/01/28/how-to-use-serilog-in-asp-net-core-web-api/

[2] https://www.youtube.com/watch?v=QjO2Jac1uQw

[3] https://www.milanjovanovic.tech/blog/5-serilog-best-practices-for-better-structured-logging

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