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  • A look out the window 
  • The future of .Net
  • Asp.Net 5 (aka vNext)
  • Hands on

A look out the window

  • Ruby on Rails + gems
  • Node.js + NPM

Why they matter

  • Very high-level languages
  • Smooth dev workflow
  • Package managers
  • Huge influence on current and future Asp.Net development

Huge open source communities - 

Comparison on # of published modules

Iper productive

var express = require('express');
var app = express();
var fs = require('fs');
// Code based configuration
  app.use(express.static(__dirname + '/public'));

app.get('/', function(req, res) {
  res.setHeader('Content-Type', 'text/html');
  fs.createReadStream(__dirname + '/index.html').pipe(res);

var port = process.env.PORT || 3000;
console.log("Express server listening on port %d in %s mode", port, app.settings.env);

Iper productive /2

  "name": "ShopWithMe",
  "description": "ShopWithMe allows you to create and share your shopping lists with your friends to collaboratively edit them",
  "version": "0.1.0",
  "private": false,
  "dependencies": {
    "express": "3.x",
    "mongoose": "3.5.x",
    "winston": "0.6.x",
    "moment": "2.1.x",
		"request": "~2.27.0"
  "devDependencies": {
    "supertest": "0.5.x",
    "mocha": "1.8.x",
    "should": "1.2.x",
    "grunt": "~0.4.0",
    "grunt-contrib-jshint": "~0.6.0",
    "grunt-contrib-concat": "~0.1.1",
    "grunt-contrib-uglify": "~0.1.0",
    "grunt-contrib-watch": "~0.1.4",
    "grunt-cafe-mocha": "~0.1.3",
    "grunt-mocha-cov": "0.0.7"
  "scripts": {
    "test": "make test",
    "blanket": {
      "pattern": [

The future of .Net

Open source all the things!

A brand new runtime

.Net Core 5

What is .Net Core 5

  • An alternative to the full .Net framework
  • Modular development stack delivered via Nuget
    • Application-local vs 
      Machine-wide framework 
  • Basis of Asp.Net 5
  • Foundation of all future .Net platforms
    • Moonshot?
    • Risk of fragmentation? 

.Net core platform
architectural diagram

.Net core platform
architectural diagram

Main features

  • Smaller API surface
  • Lighter runtime​
    • 11 MB vs 200 MB full .Net framework
  • Higher performances
  • Supports full side by side
    • The runtime is deployed alongside the app

One more thing...


Today vs tomorrow

The open .Net ecosystem

Asp.Net 5

  • Open source and accepting contributions
  • Lean and composable stack
  • Can target full .Net CLR but to get most benefits, target .Net Core 5
  • Based on OWIN
  • Drop-in support for old Asp.Net based projects

What's new

But first...

New HTTP request pipeline


  • System.Web (not even available on CoreCLR)
  • HTTP Modules
  • HTTP Handlers

functions instead!

public class Startup
    public void Configure(IApplicationBuilder app)
           new Func<RequestDelegate, RequestDelegate>(
        // Other middleware components go here
    RequestDelegate MyMiddleware(
                         RequestDelegate next)
        RequestDelegate rd = (HttpContext ctxt) =>
                          "Hello, ASP.NET 5");
            return next(ctxt);
        return rd;

Unified programming model 




New project system

  • global.json contains solution-level settings, and enables project-to-project references.
  • src folder
    • wwwroot: static content

New Project.json file 


*.csproj and packages.config files

It doesn't contain the list of files inside the project!

No more merge conflicts!

Project.json (looks familiar...)

    "dependencies": {
        "EntityFramework.SqlServer": "7.0.0-beta1",
        "Microsoft.AspNet.Mvc": "6.0.0-beta1",
        "Microsoft.AspNet.Identity.EntityFramework": "3.0.0-beta1",
        "Microsoft.AspNet.Security.Cookies": "1.0.0-beta1",
        "Microsoft.AspNet.Server.IIS": "1.0.0-beta1",
        "Microsoft.AspNet.Server.WebListener": "1.0.0-beta1",
        "Microsoft.AspNet.StaticFiles": "1.0.0-beta1",
        "Microsoft.Framework.ConfigurationModel.Json": "1.0.0-beta1",
        "Microsoft.Framework.CodeGenerators.Mvc": "1.0.0-beta1"
    "commands": {
        "web": "Microsoft.AspNet.Hosting --server Microsoft.AspNet.Server.WebListener --server.urls http://localhost:5000",
        "ef":  "EntityFramework.Commands"
    "frameworks": {
        "aspnet50": { },
        "aspnetcore50": { }

New configuration system

  • Everything is code based

    • Unlearn
      • Web.config (based on System.web)
        • cannot restart anymore AppDomain by modifying Web.config
        • configuration transformations
      • Global.asax (was based on old Http pipeline)
  • Support multiple configuration sources


public Startup()
    Configuration = new Configuration()
                //.AddIniFile("test.ini") Multiple sources

public void Configure(IApplicationBuilder app)
    var day = Configuration.Get("demo:day");
    var people = Configuration.Get<int>("demo:people");
    var cool = Configuration.Get<bool>("demo:areTheyCool");
    var tags = Configuration.Get("demo:tags").Split(';');
    app.UseMvc(routes =>
        // Classic routing code

New dependency management system

  • Supports true side by side .Net versions (CoreCLR)
    • dependencies defined into deployment package
    • Unlearn GAC!
  • Unlearn assembly references:
    • Manage dependencies by referencing NuGet packages

refresh-and-go development process

Courtesy of Roslyn

Built in dependency injection

public class Startup
    public void Configure(IApplicationBuilder app)
        app.UseServices(services =>
            // Set up the dependencies
            services.AddTransient<IFooService, FooService>();
            services.AddSingleton<IFooRepository, FooRepository>();

Demo time


A look into the future of .Net

By Valerio Gheri

A look into the future of .Net

  • 1,610
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