BlazorFluentUIPractice/BlazorFluentUI/Program.cs

using Microsoft.FluentUI.AspNetCore.Components;
using BlazorFluentUI.Components;
using BlazorFluentUI.Services;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorComponents(options =>
    {
        options.DetailedErrors = true;
    })
    .AddInteractiveServerComponents(options =>
    {
        options.DetailedErrors = true;
    });
builder.Services.AddFluentUIComponents();

builder.Services.AddSingleton<CountryService>();

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();
}

app.UseHttpsRedirection();

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

app.MapRazorComponents<App>()
    .AddInteractiveServerRenderMode();

app.Run();