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 not?! “Why did you open source the new ASP.NET?” An attitude / strategy change at Microsoft towards “Mobile first, Cloud first” Why not?!

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 GC, JIT compiler, base .NET data types, low-level classes CoreFX = foundational libraries 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? 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 dnvm use Just a text file in .dnx/alias folder 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 OS X 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 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… (solved)

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

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