Program.cs

using ElectronNET;
using ElectronNET.API;
using ElectronNET.API.Entities;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddRazorPages();
builder.Services.AddElectron(); // <- might be useful to set up DI

builder.UseElectron(args, async () =>
{
    var browserWindow = await Electron.WindowManager.CreateWindowAsync(
        new BrowserWindowOptions { Show = false, AutoHideMenuBar = true });

    browserWindow.OnReadyToShow += () => browserWindow.Show();
});

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error");
}

app.UseStaticFiles();
app.UseRouting();
app.UseAuthorization();
app.MapRazorPages();
app.Run();