ASP.NET 5
“A lean and composable framework for building web and cloud
applications”
ASP.NET now

Built upon a monolithic .NET 4.* framework

Slow release cycles

BUT! Stability is not an issue – good quality and cohesive, unified platform

Typically one FW version installed / machine – is that really an issue in the public cloud?

Well-defined set of events in the HTTP request pipeline

Extensibility through Modules, Handlers etc.

Goes hand-in-hand with IIS

How do you innovate when stability has to be maintained on millions of devices without
introducing a breaking change?
ASP.NET 5 Concepts

Cross platform

Modular

EntityFramework

Mvc

Antiforgery

CORS

Diagnostics

Identity

Caching

Routing

IISIntegration …
ASP.NET 5 Concepts

Truly Open source -– check repos at github.com/aspnet

not only “source opened”, public GitHub repos with issue tracking

non-MS contributors participate, community members can (and do) send pull
requests
ASP.NET 5 Concepts

“Why did you open source the new ASP.NET?”
Why not?!

An attitude / strategy change at Microsoft towards “Mobile first, Cloud first”
ASP.NET 5 Concepts

Deeply inspired by Node, Ruby…

Run your code anywhere, with any runtime (NVM, RVM)

Light-weight, componentized frameworks

Fast iteration cycles during development

Provide a strong REPL experience - coming to C#

Web app hosting is not tied to IIS – Kestrel, IIS, WebListener

Wide palette of dev tooling – still best quality IDE support on Windows! Don’t fear the CLI

Composable and minimal – achieve high performance


If you need a raw TCP socket, so be it
Cloud-ready + rich tooling in Visual Studio 2015

Right click, Publish… experience further improved

Azure Web app, Docker on a Linux VM
Dev stack comparison current vs vNext
Current ASP.NET stack
ASP.NET 5 Development stack
.NET Core = CoreCLR + CoreFX

CoreCLR = .NET Core Runtime + mscorlib


CoreFX = foundational libraries


GC, JIT compiler, base .NET data types, low-level classes
collections, file systems, console, XML, async, SqlClient…
https://github.com/dotnet

/coreclr

/corefx

Works with ASP.NET, that’s OK. But console tools as well

Even more: on Connect(); event native compilation was announced!

This means .NET native on Windows, Linux, OS X
ASP.NET 5 & .NET Core are RC
What does it mean? Far from RTM?

Working on ASP.NET 5 for ~ 2 years

“Go Live” support for prod systems

Feature complete

No breaking changes are expected in code, only minor API changes

RC 2 will come until 2016 – DNX will be sliced into 3 pieces

RTM is expected by the end of February 2016

Further performance improvements are to be expected until RTM
Full .NET FW vs .NET Core
Which to choose when?


.NET Core

Cross-platform – Windows, Linux, OS X,…

Deploy FW with your app – multiple FWs on the same machine

Runs in its own isolated unit – unaffected by system-wide patches

Microsoft puts huge invests into it, innovation takes places here easier

You want a fully open source stack
Full .NET FW

Reliable & fault tolerant production grade applications

Windows-heavy applications

When cross-platform is not an objective
DNX

SDK + Runtime environment = all you need to build & run .NET on any platform

Managed entry-point discovery

Host process for your .NET application (ASP.NET & console app)

provides a set of services to applications through DI e.g.:
IServiceProvider, IApplicationEnvironment, ILoggerFactory

Hosts the CLR

Different “flavors” (CoreCLR, Mono, Full .NET FW)

Open source friendly

load dependency’s source instead of binary  build in-memory  debug

“Develop on one platform. Run it anywhere”

How to obtain it?
DNVM – 1: .NET Version Manager

Manage installed DNX’s on a machine

Strong resemblance with NVM and RVM

How to get?

Windows: part of tooling that comes with AspNet5.ENU.RC1.msi

OS X / Linux
curl -sSL https://raw.githubusercontent.com/aspnet/Home/dev/dnvminstall.sh
| DNX_BRANCH=dev sh && source ~/.dnx/dnvm/dnvm.sh

What you get? Just a bunch of PS / bash scripts
DNVM – 2: command line tool

Available DNVM commands
DNVM – 3: How’s a DNX installed?

dnvm install latest –r {RUNTIME FLAVOR}

Runtime can be: coreclr | mono | clr
DNVM – 4. Choose an installed DNX

dnvm list
Just a text file in .dnx/alias
folder

dnvm use
Persist: adds to user path as well
Hosting – IIS or Kestrel or…

Kestrel is a .NET based cross-platform web server

Built on top of LibUV

Cross-plat C library

Asynchronous IO & Networking

Used by NodeJS as well

On Linux and Mac  Kestrel: command line with DNX

On Windows

Kestrel: command line with DNX

IIS: bit different than what we get used to so far

not in-proc in IIS, ASP.NET runs in its own process (dnx.exe)

IIS creates process, forwards request to it etc.
How to get started?

get.asp.net

Windows


1.) Install VS2015

2.) Download the ASP.NET 5 RC1 installer – runtime + tooling in a single MSI

3.) dnvm upgrade

4.) File – New Project…
OS X

1.) Get DNVM with CURL

2.) If you’d like to use Mono install it with Homebrew

2.) Get DNX for CoreCLR or Mono
curl -sSL https://raw.githubusercontent.com/aspnet/Home/dev/dnvminstall.sh | DNX_BRANCH=dev sh && source ~/.dnx/dnvm/dnvm.sh
dnvm upgrade -r coreclr
New Project Structure

wwwroot – JS / CSS / HTML

References - .NET assemblies

Dependencies – NPM / Bower packages

Multi-Targeting

global.json

project.json

.xproj, .sln

appsettings.json
global.json

projects [ ] – which folders contain source code?

sdk { } – which DNX version is targeted?
project.json

wwwroot location

Application version

.NET Dependencies

Commands

Target frameworks

Exclusions

Scripts to run
project.json – project.lock.json

Not for humans

Project.lock.json – flatten dependencies, write means recalc, just like Gemfile.lock
Framework multi-targeting

JSON object in project.json

With .NET Core frameworks are just folders on disk
C:\users\gkovacs\.dnx\runtimes\dnx-coreclr-win-x64.1.0.0-rc1-final

Compile for both .NET and .NET Core from the same project type in one step

Separate dependencies for each target FW in
Solution Explorer

Different icons for NuGet / binary / FW assemblies
Commands

Support for command line tooling

Supports simple invocation of a managed entry point

Can be invoked with DNX

Example: Start Kestrel Web server

When packaged, Commands are made into PS / bash scripts
DNU – .NET Development Utility

Build a project – produce assemblies from source

Package feed configuration (nuget.org, MyGet, VSO,…)

List dependencies of a given project

Create a NuGet package from a folder

Publish

Restore packages

Wrap csproj -> project.json
Dependency management - NuGet

NuGet everywhere – each project is made into a NuGet and
referenced like that

View the transitive dependencies in a hierarchical view

Same JSON property whether it be NuGet, assembly ref, source
from an open source project whatever else

“I have a list of deps, but I don’t care where they come from”
Dependency mgmt. – Bower & NPM
Application Startup

Convention based entry point in Startup class’s Configure() method

Configure()

ConfigureServices()
Startup.Configure()
Injected through the DI container
HTTP request pipeline – 1. Overview

HTTP request pipeline is fully customizable

Middleware concept – you define your own events
HTTP request pipeline – 2. Simple example

Two very simple example for middlewares

Use() and Run()
Run accepts a delegate with no
“next” reference in its signature.
Becomes always the last one in the
pipeline
HTTP request pipeline – 3. Customization

Customizable to the last bit – “Only get what you’ve paid for”

Static File handling (yes, even that!)

Dev time: BrowserLink

Dev time: Exception & DB error pages

How does it come to IIS?

How does it relate to OWIN?

Migration is supported (Katana interface is similar,
IAppBuilder)

Has OWIN compatibility, but ASP.NET 5 itself is NOT built on top of OWIN
Configuration

Where is my web.config?

A Code-based configuration approach

ConfigurationBuilder class


.AddJsonFile()

.AddEnvironmentVariables()
Environmental awareness – built-in support
for multiple environments
Dependency Injection

ASP.NET 5 has built-in DI support for basic scenarios

Core to ASP.NET, own FW’s like MVC use DI to get their components can replace with
your custom easily

Typically through extension methods in Startup.ConfigureServices(IServiceCollection
services)


Transient – new instance each time when requested (light-weight & stateless)

Scoped – once per request

Singleton – created on first request, then same instance is served in subsequent requests

Instance – add a single instance, non lazy loaded compared to Singleton
MVC 6 - Brief

A fusion of Web API and MVC

Using the same routing / filters / dependency injection…

Follows the ASP.NET 5 philosophy

Just step in Startup.Configure()
MVC 6 – Tag Helpers

Razor (no CSS IntelliSense in @class as we’re in C#)

Tag Helpers

Same equivalents of HTML Helpers

Using HTML Attributes instead of C#
EF 7 – Brief

Light-weight & extensible

Supports different OS’es

Supports different DB technologies (e.g.: SQLite on OS X)

Not only for relational DBs: Azure Table Storage & Redis

Removing: EDMX, ObjectContext, MEST, very complex type <-> table mappings
Performance

github.com/aspnet/benchmarks

TechEmpowered

PlainText benchmark


Sends back “Hello World”

Goes through the HTTP pipeline (routing, etc.)
(ASP).NET perf on Win vs Linux?
Deployment – Visual Studio tooling

File System

Docker on a Linux VM: right click, Publish

Azure Web App: right click, Publish
Deployment – Visual Studio tooling
Content to be published
Invoke MSDeploy
Tools for Cross-Platform Development

VSCode is always a fine option on OS X & Linux

No .xproj, .sln files required – completely decoupled from Visual Studio

OmniSharp -> not only in VSCode but Sublime, Emacs…
Determines runtime
based on global.json
Parses discovered
DNX projects to
provide code editor
services
Tools for Cross-Platform Development
X-Plat is not easy

Max path restriction (solved)

Console.Color ???

Eventing – no ETW other places, some analogue is found, usually OS es have
same needs but implemented differently – same exp is provided

SqlClient and ADO.NET had lots of native dependencies on Windows, built ~10
years ago. Porting was a P.I.T.A. SqlClient almost completely rewritten in C#
to support other OSes

Hard to achieve a dev experience like VS on other OS’es

Exception handling / (async) debugging / interactive windows / live perf view /
BrowserLink / designers…
Resources

Try it at home - get.asp.net

Books – not yet

Read the docs - docs.asp.net

Channel9, MVA courses…

Check the source


github.com/aspnet

github.com/dotnet/coreclr

github.com/dotnet/corefx
Community Standups – live.asp.net
Q&A

https://pixelastic.github.io/pokemonorbigdata/