ASP Core .NET 6 works when I run it manually, but it fails when I install as windows service - asp.net-core

Question

I have an ASP Core .NET 6 application that I want to install as windows services.
I am using minimal API and this is the code:
using Microsoft.AspNetCore.ResponseCompression;
using Microsoft.AspNetCore.Server.Kestrel.Core;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Hosting.WindowsServices;
using System.IO.Compression;
using System.Security.Cryptography.X509Certificates;
using GestorOrdenadores.Service.Server.Grpc;
using Serilog;
using Microsoft.Extensions.Configuration;
using Serilog.Events;
File.AppendAllText("LogManual.txt", DateTime.Now + ": Iniciado");
Log.Logger = new LoggerConfiguration()
.WriteTo.Console()
.CreateBootstrapLogger();
Log.Information("Starting up");
try
{
WebApplicationOptions options = new WebApplicationOptions
{
Args = args,
ContentRootPath = WindowsServiceHelpers.IsWindowsService() ? AppContext.BaseDirectory : default
};
WebApplicationBuilder builder = WebApplication.CreateBuilder(options);
builder.Host.UseSerilog((ctx, lc) => lc
.WriteTo.Console()
.ReadFrom.Configuration(ctx.Configuration));
builder.WebHost.ConfigureKestrel((context, options) =>
{
string miStrCertificado = File.ReadAllText("certificados/server.crt");
string miStrKey = File.ReadAllText("certificados/server.key");
X509Certificate2 miCertficadoX509 = X509Certificate2.CreateFromPem(miStrCertificado, miStrKey);
X509Certificate2 miCertificado2 = new X509Certificate2(miCertficadoX509.Export(X509ContentType.Pkcs12));
miCertficadoX509.Dispose();
options.ListenAnyIP(5001, listenOptions =>
{
listenOptions.Protocols = HttpProtocols.Http1AndHttp2;
listenOptions.UseHttps(miCertificado2);
});
});
builder.Services.AddGrpc();
builder.Host.UseWindowsService();
WebApplication app = builder.Build();
app.UseSerilogRequestLogging();
app.MapGrpcService<GestorOrdenadoresService>();
app.MapGet("/", () => "Communication with gRPC endpoints must be made through a gRPC client. To learn how to create a client, visit: https://go.microsoft.com/fwlink/?linkid=2086909");
await app.RunAsync();
}
catch(Exception ex)
{
File.AppendAllText("LogManual.txt", DateTime.Now + ": EXCEPTION: " + ex.Message);
Log.Fatal(ex, "Unhandled exception");
}
finally
{
File.AppendAllText("LogManual.txt", DateTime.Now + ": Finally");
Log.Information("Shut down complete");
Log.CloseAndFlush();
}
When I debug or run the application manually, it creates the log, but when I install the service and try to run it, in the service manager of windows, when I click to start, I get the error 1067.
If I go to the event viewer of windows, I get the error with ID 7034.
And in this case no log files are created.
How the application can run when I run it manually, I guess the problem is how I try to set the service part of the code, but I don't know how could be the problem.

Answer 1

Win32 services run in %WinDir%\System32 by default (as I describe on my blog), and I'd be surprised if you could just write out a LogManual.txt in that folder. So, you're probably getting an exception, which is causing your service to fail to start.
A lot of services find this inconvenient, and change their working directory on startup:
Environment.CurrentDirectory = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);