davidfowl

$/
  artifacts/
  build/
  docs/
  lib/
  packages/
  samples/
  src/
 tests/

davidfowl

Migration to ASP.NET Core in .NET 6

• WebApplication and WebApplicationBuilder
• Differences in the hosting model
• Building libraries for ASP.NET Core
• FAQ
• Cheatsheet

WebApplication and WebApplicationBuilder

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using Microsoft.Extensions.Configuration.Memory;

var builder = WebApplication.CreateBuilder(args);

builder.Configuration.AddConfigurationDefaults(new()
{
    { "request:timeout", "60" }
});

var app = builder.Build();

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using System;
using System.Linq;
using System.Diagnostics;
using System.Linq.Expressions;
using System.Reflection;
using System.Collections.Generic;

namespace ConsoleApplication3
{
    class Program

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using System;
using System.Collections.Generic;
using System.Web;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;
using Microsoft.Extensions.DependencyInjection;
using WebApplication16;
using WebApplication16.Controllers;

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using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Hosting;

public class Program
{
    public static void Main(string[] args) =>
        Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webBuilder =>

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Minimal APIs at a glance

This document now exists on the official ASP.NET core docs page.

• Application
  • WebApplication
  • WebApplicationBuilder
• Request Handling
  • Routing
  • Parameter Binding

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namespace Analogy
{
    /// <summary>
    /// This example shows that a library that needs access to target .NET Standard 1.3
    /// can only access APIs available in that .NET Standard. Even though similar the APIs exist on .NET 
    /// Framework 4.5, it implements a version of .NET Standard that isn't compatible with the library.
    /// </summary>INetCoreApp10
    class Example1
    {
        public void Net45Application(INetFramework45 platform)

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public void ConfigureServices(IServiceCollection services)
{
    services.AddHttpClient("myclient");

    // Global header propagation for any HttpClient that comes from HttpClientFactory
    services.AddHeaderPropagation(options =>
    {
        options.HeaderNames.Add("Correlation-Id");
    });
}

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using System.Diagnostics;
using System.Net.Sockets;
using System.Security.Authentication;
using Yarp.Telemetry.Consumption;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddTelemetryConsumer<TelemetryConsumer>();

var app = builder.Build();