What should you know about Net Core?

.NET Core
daenet Lead Architect, Microsoft Regional Director, Azure MVP
@ddobric
Damir Dobric
https://about.me/damirdobric

AGENDA
 Intro
 Building, Linking Optimizing
 Performance improvements
 Benchmark .NET
 Ref Types, Span<T>
 Assembly forwarding
 Global Tools
 .NET Core IoT (Pi)
 What is coming in .NET 3?

.NET Core is
a general purpose development platform
with cross-platform support for
Windows, macOS and Linux,
various devices and
cloud
https://docs.microsoft.com/en-us/dotnet/core/

https://github.com/dotnet/core/blob/master/microsoft-support.md

Welcome .NET Core 2.1.x
 Plattform support
 Windows Client: 7, 8.1, 10 (1607+)
 Windows Server: 2008 R2 SP1+
 macOS: 10.12+
 RHEL: 6+
 Fedora: 26+
 Ubuntu: 14.04+
 Debian: 8+
 SLES: 12+
 openSUSE: 42.3+
 Alpine: 3.7+
https://github.com/dotnet/core/blob/master/release-notes/2.1/2.1-supported-os.md
 Chip support
 x64 on:
 Windows,
 macOS,
 Linux
 x86 on
 Windows
 ARM32 on Linux (Ubuntu 18.04+, Debian 9+)
 VS 15.7

Framework Dependent (FDD) vs. Self-Contained (SC)
>dotnet publish -c release -r win-x64 -o out
>dotnet publish -c release
FDD
SC

TRUE is default
Self-Contained publish with small footprint
>dotnet new nuget
<ItemGroup>
<PackageReference Include="ILLink.Tasks" Version="0.1.4-preview-906439" />
</ItemGroup>
>dotnet publish -c release -r win-x64 -o out-with-linker
/p:LinkDuringPublish=true /p:ShowLinkerSizeComparison=true
Generates details
related to linking
process
Required to
activate IL Linker
Activates v3 feed
with IL-Linker

ShowLinkerSizeComparison
100%
means not used at all.
0%
No optimization.
Most likely your own
code
Typical case. This app
use Console.

Build Performance Improvements

Runtime JIT Performance Improvements
 Devirtualization => Micro-optimization
 JIT is able to statically determine the target of some virtual invocations
 Avoid virtual dispatch costs and enable potential inlining
https://www.infoq.com/news/2017/12/Devirtualization

Runtime Performance Improvements
 String improvements
 String.Equal
 String.IndexOfAny
 String.ToLower, String.ToUpper
 String.Concat
 Formatting and Parsing
 String.Format
 Type.Parse
 Networking
 Parsing of URIs and IPAdresses
 HttpClient, Socket and SslStream
 File System

Runtime Thread Performance Improvements
 Access to thread static [ThreadStatic]
 Improves scalable code with access to thread statics.
 Timer Global lock optimization
 Improves creation of many timer
 Create/Dispose cancelation tokens
 Async/Await overhead reduced
https://blogs.msdn.microsoft.com/dotnet/2018/04/18/performance-improvements-in-net-core-2-1/
v2.0: 20.36 ns
v2.1: 13.48 ns

https://blogs.msdn.microsoft.com/dotnet/2018/04/18/performance-improvements-in-net-core-2-1/
https://github.com/dotnet/BenchmarkDotNet

C# 7.2
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
<LangVersion>7.2</LangVersion>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
<LangVersion>7.2</LangVersion>
</PropertyGroup>

“Ref” returns
 A reference return value allows a method to return a reference to a
variable
public ref T this[int index] { get { ... } }
https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/ref-returns
ref var value = ref store.FindNumber(number);
public ref int FindNumber(int target)
{
for (int ctr = 0; ctr < numbers.Length; ctr++)
{
if (numbers[ctr] >= target)
return ref numbers[ctr];
}
return ref numbers[0];
}

DEMO
Read Only Ref ‘in’ in C# 7.2, 7.3
Returning references

Span<T>
 ref T field in C# and MSIL
 Span<T> uses a special internal type in the runtime that’s treated as a
just-in-time (JIT) intrinsic
https://msdn.microsoft.com/en-us/magazine/mt814808.aspx

DEMO
New era of memory management
Span<T>

Windows Compatibility Pack
 20000 APIs
 Windows only
 Cross-platform
https://github.com/dotnet/docs/blob/master/docs/core/porting/windows-compat-pack.md
<ItemGroup>
<PackageReference
Include="Microsoft.Windows.Compatibility"
Version="2.0.0" />
</ItemGroup>

.NET Global Tools
Run tool
Tool can do anything
https://github.com/natemcmaster/dotnet-tools

.NET Global Tools
 Creat32e tool
 Pack:
 Find tool on web or Nuget.Org
 Install the tool.
 Location:
 Command:
 Call the tool.
 Update the tool.
 Uninstall the tool.
<PackAsTool>true</PackAsTool>
dotnet tool install -g toolsample
%USERPROFILE%.dotnettools $HOME/.dotnet/tools
toolsample
dotnet pack -c release -o nupkg
dotnet tool update -g toolsample
dotnet tool uninstall -g toolsample
https://docs.microsoft.com/en-us/dotnet/core/tools/global-tools

Roll Forward
 .NET Core 2.N forwarded to .NET Core 2.N+M
 Example: .NET Core 2.1 -> .NET Core 2.3
 Example: .NET Core 2.1 -> .NET Core 3.0 (NOT SUPPORTED!)
 Minor versions only
 Doesn't occur between preview versions and release versions.

.NET Core for IoT
 ARM 32 support
 GPIO (planning)
 .NET Core GPIO support is coming
https://github.com/ianhays/corefxlab/blob/gpio/src/System.Devices.Gpio/Planning.md
 You can start now with GPIO in .NET Core
https://jeremylindsayni.wordpress.com/2017/05/01/controlling-gpio-pins-using-a-net-core-2-
webapi-on-a-raspberry-pi-using-windows-10-or-ubuntu/
 .NET Core on Raspberry 2+
 Setup Ubuntu
-https://ubuntu-mate.org/blog/ubuntu-mate-xenial-final-release
https://github.com/dotnet/core/blob/master/samples/RaspberryPiInstructions.md

.NET Core on Linux (ARM 32)
https://blogs.msdn.microsoft.com/benjaminperkins/2017/10/18/create-a-net-core-2-application-on-linux-with-visual-studio-code/
https://developers.de/2018/06/06/setup-net-core-2-1-on-arm
$ sudo apt-get -y update
$ sudo apt-get -y install libunwind8 gettext
$ wget https://dotnetcli.blob.core.windows.net/dotnet/Sdk/2.1.300/dotnet-sdk-linux-arm.tar.gz
$ wget https://dotnetcli.blob.core.windows.net/dotnet/aspnetcore/Runtime/2.1.0/aspnetcore-runtime-2.1.0-linux-
arm.tar.gz $ sudo mkdir /opt/dotnet
$ sudo tar -xvf dotnet-sdk-2.1.300-linux-arm.tar.gz -C /opt/dotnet/
$ sudo tar -xvf aspnetcore-runtime-2.1.0-linux-arm.tar.gz -C /opt/dotnet/ $ sudo ln -s /opt/dotnet/dotnet /usr/local/bin

Windows Forms and UWP in .NET Core
 Support for WinForms and WPF
 Apps can be self-contained and run in a single folder.
 XCOPY deployment
 No requirement to install anything
else (Self-Contained)
 C#, F#, VB
 Migration support from .NET 3.5
apps to .NET Core 3
 NO LINUX SUPPORT!

Recap
 V2.1 is RTM. Long Term Support
 Faster build
 Better Memory Management=>Performance Improvements
 Lot of micro-improvements (i.e.: devirtualization)
 IL Linker => Footprint optimization
 Span<TEverything>
 Global Tools are nuget packages. In .csproj <PackAsTool>true</PackAsTool>
 ARM 32 support. Runs on Raspberry PI 2+
 .NET 3.0:
 Self-contained assembly =>XCOPY
 WPF/WinForms

References
 Summary
 https://blogs.msdn.microsoft.com/dotnet/2018/05/30/announcing-net-core-2-1/
 Video .NET Core 2.1 and .NET Core 3
https://youtu.be/KAIJ3ezQb3c
 Setup .NET Core on ARM (PI)
 https://developers.de/2018/06/06/setup-net-core-2-1-on-arm
 IL Linker
 https://github.com/dotnet/core/blob/master/samples/linker-instructions.md
 GPIO Roadmap
 https://github.com/ianhays/corefxlab/blob/gpio/src/System.Devices.Gpio/Planning.md
 .NET Core on Linux with VS code
 https://blogs.msdn.microsoft.com/benjaminperkins/2017/10/18/create-a-net-core-2-
application-on-linux-with-visual-studio-code

Damir Dobric
https://about.me/damirdobric
Vielen Dank


Introduction to .NET Core
DEWX 2017

• Creating and deploying .NET core Applications
• .NET Standard
• Unit Testing .NET Core
• Migration
• Dependency Injection
• Logging
AGENDA

Creating and Running .NET Core applications
dotnet new console
dotnet restore
dotnet build
dotnet run

Types of Deployment
 Framework Dependent
 Net Core Framework must be installed on the machine
 Small application footprint
 Framework Independent
 Net Core framework does not have to be installed
 Framework is installed (xcopy) with application binaries
 Bigger footprint
 Every application can use any kind of framework

Framework Dependent Application
 dotnet restore
 dotnet build
 dotnet publish -f netcoreapp2.0 -c Debug

Framework Independent Application
dotnet publish -r win10-x64 --self-contained
<RuntimeIdentifiers>
win10-x64;osx.10.11-x64
</RuntimeIdentifiers>

What is .NET Standard?
The .NET Standard is an API spec that describes
the consistent set of .NET APIs that developers
can expect in each .NET implementation
https://github.com/dotnet/standard/blob/master/docs/versions.md

.NET Standard
 PCL is common lowest
denominator
 Standard is replacement for PCL

Which standard should I support?
1.0 2.0
NumberofAPIs
NumberofApplications
1.1 1.2 1.3 1.4 1.5 1.6

What should you know about Net Core?

API Browser
https://apisof.net

Cross Referencing
 netstandard 2.0 -> netstandard 1.1,..,1.6
 net461 -> netstandard 2.0
error CS0012: The type 'Object' is defined in an assembly that is not
referenced. You must add a reference to assembly 'netstandard,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.
 Net452 -> netstandard 2.0
error : Project “NetCoreLib2.csproj' targets '.NETStandard,Version=v2.0’.
It cannot be referenced by a project that targets
'.NETFramework,Version=v4.5.2’.
 ss

Unit testing with XUnit
<ItemGroup>
<PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />
<PackageReference Include="xunit" Version="2.2.0" />
<PackageReference Include="xunit.runner.visualstudio" Version="2.2.0" />
</ItemGroup>

Unit testing with MSTest
<ItemGroup>
<PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />
<PackageReference Include="MSTest.TestAdapter" Version="1.1.11" />
<PackageReference Include="MSTest.TestFramework" Version="1.1.11" />
</ItemGroup>

Test Execution
 dotnet test -h
 dotnet test --list-tests
 Execute specific tests
 dotnet test --filter "MessageOnly_LogsCorrectValues“
 dotnet test --filter Message -v d
 dotnet test --filter Message -v n
 dotnet test --filter Message -v d
 dotnet test --filter Message –filter ”Priority = 1”

Migration of .NET to .NET Core

API PORT ANALYZER
https://github.com/Microsoft/dotnet-apiport/
apiport analyze -f AddTokenGenDotNet.exe

Dependency Injection
• Inversion of Control IoC in 5 Min.
• Service Locator

Arguments are injected in constructor
public class MySmsSender : ISmsProvider
{
private readonly SmsTradeSettings m_Settings;
private readonly ILogger m_Logger;
public SmsTradeSender(IOptions<SmsTradeSettings> options,
ILogger<SmsTradeSender> logger) :this(options.Value, logger)
{
}
public SmsTradeSender(SmsSettings settings, ILogger<MySmsSender> logger)
{
m_Settings = settings;
m_Logger = logger;
}
}

Required Packages
 Microsoft.Extensions.Configuration
 Microsoft.Extensions.Configuration.Binder
 Microsoft.Extensions.Configuration.Json
 Microsoft.Extensions.DependencyInjection
 Microsoft.Extensions.Options

Required Packages
 Microsoft.Extensions.Logging
 Microsoft.Extensions.Logging.Console
 Microsoft.Extensions.Logging.Debug
 Microsoft.Extensions.Logging.EventHub (*)
 …

How to build UI with .NET Core
 Graphic support overview
https://github.com/dotnet/corefx/issues/20325
 Open Source 2D Graphics Library
https://skia.org/

• Creating and deploying .NET core Applications
• .NET Standard
• Unit Testing .NET Core
• Migration
• Logging
Recap

References
 .NET Core Guide:
 https://docs.microsoft.com/en-us/dotnet/core/
 Specification netstandard 2.0
 https://github.com/dotnet/standard/blob/master/docs/netstandard-20/README.md
 Building a C# Hello World Application with .NET Core in Visual Studio 2017 - Learn to to build,
debug, and publish a simple .NET Core console application using Visual Studio 2017.
 Building a class library with C# and .NET Core in Visual Studio 2017 - Learn how to build a class
library written in C# using Visual Studio 2017.
 Get started with Visual Studio Code using C# and .NET Core on Windows - This Channel9 video
shows you how to install and use Visual Studio Code, Microsoft's lightweight cross-platform code
editor, to create your first console application in .NET Core.
 Get Started with .NET Core and Visual Studio 2017 - This Channel9 video shows you how to install
and use Visual Studio 2017, Microsoft's fully-featured IDE, to create your first cross-platform console
application in .NET Core.
 Getting started with .NET Core using the command-line - Use any code editor with the .NET Core
cross-platform command-line interface (CLI).

What should you know about Net Core?

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