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

davidfowl

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

davidfowl

using System.Buffers;
using System.Net.WebSockets;

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

app.MapGet("/ws", async (HttpContext context) =>
{
    const int MaxMessageSize = 1024 * 1024;

davidfowl

#!/usr/bin/env dotnet run

var builder = WebApplication.CreateBuilder(args);
var config = builder.Configuration;
var connString = config["connectionString"] ?? "Data Source=todos.db";

builder.AddDbContext<TodoDb>(options => options.UseSqlite(connString));
builder.AddSqlite<Todo>(connString) // Higher level API perhaps?

var app = builder.Build();

davidfowl

using System;
using System.Threading.Tasks;

namespace System.Collections.Concurrent
{
    public static class ConcurrentDictionaryExtensions
    {
        /// <summary>
        /// Provides an alternative to <see cref="ConcurrentDictionary{TKey, TValue}.GetOrAdd(TKey, Func{TKey, TValue})"/> that disposes values that implement <see cref="IDisposable"/>.
        /// </summary>

davidfowl

using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Runtime.Loader;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc.ApplicationParts;
using Microsoft.AspNetCore.Mvc.Infrastructure;

davidfowl

var t1 = DoFooAsync(obj);
var t2 = DoBarAsync(obj);

var t = await WhenAnySuccessOrAllFail(t1, t2);

async Task WhenAnySuccessOrAllFail(params Task[] tasks)
{
    var remaining = new List<Task>(tasks);

    while (remaining.Count > 0)

davidfowl

// Question: Implement a route matching enging
// Given a list of routes as a list of strings and a matching route, build a route matching engine
// that returns true if a path matches.

const routes = ['/foo/blah/bar', '/foo', '/products']

function buildTrie(routes) {
    var root = { path: {} };
    for (var route of routes) {
        var node = root;

davidfowl

using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Loader;
using System.Threading;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;

davidfowl

using System;
using System.Collections.Generic;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.ApplicationParts;
using Microsoft.AspNetCore.Mvc.Infrastructure;