I have ASP.NET server. I would like to log fatal error, that crashes server. And save in database some information about this fatal error. What should I use? I thought about IHostApplicationLifetime, but it's used for graceful shutdown and not for fatal errors.

CodePudding user response：

if you use serilog you could do something like this

public static void Main(string[] args)
{
    Log.Logger = new LoggerConfiguration()
                .MinimumLevel.Debug()
                .MinimumLevel.Override("Microsoft.AspNetCore", LogEventLevel.Warning)
                .MinimumLevel.Override("Microsoft.EntityFrameworkCore",LogEventLevel.Warning)
                .Enrich.FromLogContext()
                .WriteTo.Console(outputTemplate: "[{Timestamp:HH:mm:ss} {Level}] {SourceContext}{NewLine}{Message:lj}{NewLine}{Exception}{NewLine}", theme: AnsiConsoleTheme.Literate)
                .WriteTo.File(new JsonFormatter(),"\logs\serilog.json", shared: true)
               .CreateLogger();

            try
            {
                Log.Information("Starting up");
                CreateHostBuilder(args).Build().Run();
            }
            catch (Exception ex)
            {
                Log.Fatal(ex, "Application start-up failed");
            }
            finally
            {
                Log.CloseAndFlush();
            }
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup<Startup>();
                webBuilder.UseSerilog();
            });
    }