RBLNews/RBLNews.Web/Program.cs

using RBLNews.Shared.Services;
using RBLNews.Web.Components;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorComponents()
	.AddInteractiveServerComponents();
builder.Services.AddBlazorBootstrap();

builder.Services.AddSingleton<IFeedDataService, FeedDataService>();
builder.Services.AddSingleton<AppLifecycleService>();
builder.Services.AddSingleton<EnvironmentVariablesService>();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
	app.UseExceptionHandler("/Error", createScopeForErrors: true);

	// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
	app.UseHsts();
}

using var serviceScope = app.Services.CreateScope();
IServiceProvider services = serviceScope.ServiceProvider;

EnvironmentVariablesService environmentVariablesService = services.GetRequiredService<EnvironmentVariablesService>();
string? backendApiUrl = environmentVariablesService.RblApiUrl;

if (string.IsNullOrEmpty(backendApiUrl))
{
	throw new Exception($"can't instantiate services, due to paramters are null. backendApiUrl: '{backendApiUrl}'");
}

app.UseHttpsRedirection();

app.UseStaticFiles();
app.UseAntiforgery();

app.MapRazorComponents<App>()
	.AddInteractiveServerRenderMode()
	.AddAdditionalAssemblies(typeof( RBLNews.Shared._Imports ).Assembly);

app.Run();