AnthonyGiretti

// Before ASP.NET Core 10, depending on the scenario:
// Some attributes were ignored
// Record struct parameters weren’t validated consistently
// Constructor binding didn’t always trigger annotation checks.

public readonly record struct UserInput(
    [Required] string Name,
    [Range(18, 99)] int Age);

AnthonyGiretti

var builder = WebApplication.CreateBuilder(args);

....

builder.WebHost.UseUrls(
    "https://api.localhost:7001",
    "https://admin.localhost:7002",
    "https://frontend.localhost:7003");

var app = builder.Build();

AnthonyGiretti

{
  "Kestrel": {
    "Endpoints": {
      "Api": {
        "Url": "https://api.localhost:7001"
      },
      "Admin": {
        "Url": "https://admin.localhost:7002"
      },
      "Frontend": {

AnthonyGiretti

{
  "profiles": {
    "ApiApp": {
      "commandName": "Project",
      "dotnetRunMessages": true,
      "applicationUrl": "https://api.localhost:7001",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },

AnthonyGiretti

// Before ASP.NET Core 10
// Order matters
app.UseAuthentication();
app.UseRouting();
app.UseAuthorization();  // This might run before endpoint metadata is fully known
app.MapControllers();

// With ASP.NET Core 10
// Order does not matter
app.UseRouting();

AnthonyGiretti

builder.Services
    .AddOpenTelemetry()
    .ConfigureResource(r => r.AddService(
        serviceName: builder.Environment.ApplicationName,
        serviceVersion: "1.0.0"))
    .WithMetrics(metrics =>
    {
        // HTTP pipeline instrumentation (http.server.* etc.)
        metrics.AddAspNetCoreInstrumentation();

AnthonyGiretti

import { Injectable, NgZone } from '@angular/core';
import { Observable } from 'rxjs';
import { Country } from './country.model';

@Injectable({ providedIn: 'root' })
export class CountryStreamService {

  private readonly url = 'https://localhost:5001/countries/stream';

  constructor(private zone: NgZone) {}

AnthonyGiretti

var app = builder.Build();

app.UseCors();

// SSE endpoint in ASP.NET Core 10
app.MapGet("/countries/stream", (CountryService service, CancellationToken ct) =>
{
    var stream = service.StreamCountries(ct);

    // Each Country will be sent as an SSE event named "country"

AnthonyGiretti

public static class AudioAnalyzer
{
    public static double AverageLevel(ReadOnlySpan<byte> data)
        => data.IsEmpty ? 0 : data.ToArray().Average(b => (double)b);
}

var bytes = track.RawData; // byte[]

// Before C# 14
AudioAnalyzer.AverageLevel(bytes.AsSpan()); // implicit conversion

AnthonyGiretti

// Not allowed before C# 14, does not compile
track?.Info = new Metadata();
track?.Info?.Duration = TimeSpan.Zero;
playlist?["title"] = "My Mix";

// Must do this
if (track != null && track.Info != null)
{
    track.Info.Duration = TimeSpan.FromMinutes(5);
}