how can i use var in .NET 8

Question

I upgraded from .NET 6 to 8 and there is no startup anymore and when I create some code doesn't work and some are declared and error 501.35 something like that and I wanted a

create var

var builder = services.AddIdentityServer(options =>
{
    options.Events.RaiseErrorEvents = true;
    options.Events.RaiseInformationEvents = true;
    options.Events.RaiseFailureEvents = true;
    options.Events.RaiseSuccessEvents = true;
    options.EmitStaticAudienceClaim = true;
}).AddInMemoryIdentityResources(SD.IdentityResources)
.AddInMemoryApiScopes(SD.ApiScopes)
.AddInMemoryClients(SD.clients)
.AddAspNetIdentity <AppDbContext>();

can does not work in .Net 8

and Bing AI create this

//YourStartup
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddDbContext<ApplicationDbContext>(options =>
                options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
            services.AddIdentity<ApplicationUser, IdentityRole>()
                .AddEntityFrameworkStores<ApplicationDbContext>().AddDefaultTokenProviders();

            var builder = services.AddIdentityServer(options =>
            {
                options.Events.RaiseErrorEvents = true;
                options.Events.RaiseInformationEvents = true;
                options.Events.RaiseFailureEvents = true;
                options.Events.RaiseSuccessEvents = true;
                options.EmitStaticAudienceClaim = true;
            }).AddInMemoryIdentityResources(SD.IdentityResources)
            .AddInMemoryApiScopes(SD.ApiScopes)
            .AddInMemoryClients(SD.Clients)
            .AddAspNetIdentity<ApplicationUser>();

            services.AddScoped<IDbInitializer, DbInitializer>();
            services.AddScoped<IProfileService, ProfileService>();
            builder.AddDeveloperSigningCredential();

            services.AddControllersWithViews();
        }

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

And someone can help at least sometimes the builder. Service instead of

var builder = WebApplication.CreateBuilder(args) builder. Services.example();

Answer 1

its really simple to convert startup code to program.cs.

var builder = WebApplication.CreateBuilder(args);
var services = builder.Services;

// do configure service
services.AddDbContext<ApplicationDbContext>(options =>
    options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
services.AddIdentity<ApplicationUser, IdentityRole>()
    .AddEntityFrameworkStores<ApplicationDbContext>().AddDefaultTokenProviders();

var identBuilder = services.AddIdentityServer(options =>
{
    options.Events.RaiseErrorEvents = true;
    options.Events.RaiseInformationEvents = true;
    options.Events.RaiseFailureEvents = true;
    options.Events.RaiseSuccessEvents = true;
    options.EmitStaticAudienceClaim = true;
}).AddInMemoryIdentityResources(SD.IdentityResources)
  .AddInMemoryApiScopes(SD.ApiScopes)
  .AddInMemoryClients(SD.Clients)
  .AddAspNetIdentity<ApplicationUser>();
 
services.AddScoped<IDbInitializer, DbInitializer>();
services.AddScoped<IProfileService, ProfileService>();
identbuilder.AddDeveloperSigningCredential(); // I'd skip the identbuilder an just add to the previous

services.AddControllersWithViews();

var app = builder.Build();

// do app config
if (env.IsDevelopment())
{
     app.UseDeveloperExceptionPage();
}
else
{
   app.UseExceptionHandler("/Home/Error");
   app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();
app.UseIdentityServer();
app.UseAuthorization();
dbInitializer.Initialize();
app.UseEndpoints(endpoints =>
{
    endpoints.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");
});