ASP.NET Core Interview Question: What is startup class?

by amirdaraee

Posted on 24/08

credit: pxfuel.com

ASP.NET Core Interview Question: What is startup class

At the heart of every ASP.NET Core projects lies the startup class. Basicly it's the starting point of your application and as a developer we will need to make changes to this class pretty often.

There are some notable methods in startup class:

1- Constructor: It takes an IConfiguration value which will give us access to settings in appSettings.json and appSettings.Development.json.

public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }
}

2- ConfigureServices: It takes an IServiceCollection value which will allow us to register frameworks and dependencies.

// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
    services.AddDbContext(options =>
        options.UseSqlServer(
            Configuration.GetConnectionString("DefaultConnection")));
    services.AddDatabaseDeveloperPageExceptionFilter();
    services.AddDefaultIdentity(options => options.SignIn.RequireConfirmedAccount = true)
        .AddEntityFrameworkStores();
    services.AddControllersWithViews();
}

3- Configure Method: It takes IApplicationBuilder and IWebHostEnvironment which will help us setup our runtime request pipeline.

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
        app.UseMigrationsEndPoint();
    }
    else
    {
        app.UseExceptionHandler("/Home/Error");
        // 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.UseRouting();
    app.UseAuthentication();
    app.UseAuthorization();
    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllerRoute(
            name: "default",
            pattern: "{controller=Home}/{action=Index}/{id?}");
        endpoints.MapRazorPages();
    });
}
Categories