ASP.NET Core Application Logs Not Written To Blob in Azure App Service

If we want to write Application logs to Azure blob storage ,firstly we need to enable Application log and configure blob storage for it on the Azure portal.

We could following the blog to set up logging in the Asp.net core app.

setting up logging in an ASP.NET Core app doesn’t require much code. ASP.NET Core new project templates already setup some basic logging providers with this code in the Startup.Configure method:

loggerFactory.AddConsole(Configuration.GetSection("Logging")); 
loggerFactory.AddDebug();

I also do demo for it. It works correctly on my side.

1.In the Sartup.cs file add the following code

 loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();
            loggerFactory.AddAzureWebAppDiagnostics(
                new AzureAppServicesDiagnosticsSettings
                {
                    OutputTemplate = "{Timestamp:yyyy-MM-dd HH:mm:ss zzz} [{Level}] {RequestId}-{SourceContext}: {Message}{NewLine}{Exception}",

                }
            );

2.add following code in the HomeController.cs

 private readonly ILogger _logger;
 public HomeController(ILoggerFactory loggerFactory)
 {
     _logger = loggerFactory.CreateLogger<HomeController>();
 }

 public IActionResult Index()
 {
    _logger.LogInformation("Log information");
    _logger.LogError("Logger error");
    return View();
 }

3.Visit the home/index page and check it from the Azure storage blob. Last section of log blob name. Defaults to "applicationLog.txt". We also could set it ourselves.