What's new in .NET Core and C# Space? .NET Core 3.0 and convergence towards .NET 5. C# 8.0. Desktop development rewamped.

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Visual Studio Saturday 2019
.NET & C# Updates Fall 2019
Marco Parenzan

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The .NET and .NET Core Path

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What’s new in .NET Core 3.0
• C# 8.0
• .NET Standard 2.1
• Improved .NET Core Version APIs
• .NET Platform-Dependent Intrinsics
• Default executables
• Single-file executables
• Assembly linking
• Tiered compilation
• ReadyToRun images
• Build copies dependencies
• Local tools
• Major-version Roll Forward
• Windows desktop
• COM-callable components - Windows Desktop
• MSIX Deployment - Windows Desktop
• WinForms high DPI
• Ranges and indices
• Async streams
• IEEE Floating-point improvements
• Fast built-in JSON support
• Interop improvements
• HTTP/2 support
• TLS 1.3 & OpenSSL 1.1.1 on Linux
• Cryptography ciphers
• Cryptographic Key Import/Export
• SerialPort for Linux
• Docker and cgroup memory Limits
• Smaller Garbage Collection heap sizes
• Garbage Collection Large Page support
• GPIO Support for Raspberry Pi
• ARM64 Linux support

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.NET 5
INFRASTRUCTURE
.NET STANDARD
DESKTOP WEB CLOUD MOBILE GAMING IoT AI
WPF
Windows Forms
UWP
ASP.NET Xamarin UnityAzure ARM32
ARM64
ML.NET
.NET for
Apache Spark
.NET – A unified platform

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.NET Schedule
• .NET Core 3.0 released today!
• .NET Core 3.1 = Long Term Support (LTS)
• .NET 5.0 release in November 2020
• Major releases every year, LTS for even numbered releases
• Predictable schedule, minor releases if needed
July 2019
.NET Core 3.0
RC
Sept 2019
.NET Core 3.0
Nov 2019
.NET Core 3.1
LTS
Nov 2020
.NET 5.0
Nov 2021
.NET 6.0
LTS
Nov 2022
.NET 7.0
Nov 2023
.NET 8.0
LTS

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.NET Core SDK Windows Installer
• The MSI installer for Windows has changed starting with .NET
Core 3.0. The SDK installers will now upgrade SDK feature-band
releases in place. Feature bands are defined in
the hundreds groups in the patch section of the version number.
For example, 3.0.101 and 3.0.201 are versions in two different
feature bands while 3.0.101 and 3.0.199 are in the same feature
band. And, when .NET Core SDK 3.0.101 is installed, .NET Core
SDK 3.0.100 will be removed from the machine if it exists. When
.NET Core SDK 3.0.200 is installed on the same machine, .NET
Core SDK 3.0.101 won't be removed.

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Single-file executable
Con questa opzione possiamo ottenere un solo exe/eseguibile
che contenga tutto il necessario affinché l'applicativo funzioni.
Questo file alla prima esecuzione scompatta tutte le dll e le
dipendenze in una cartella temporanea e lancia l'app.
<PropertyGroup>
<RuntimeIdentifier>win10-x64</RuntimeIdentifier>
<PublishSingleFile>true</PublishSingleFile>
</PropertyGroup>

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Single-file executable
• La prima esecuzione rallenta notevolmente il cold startup perciò lo
rende più ideale in ambiti desktop dove si vuole privilegiare la facilità
di distribuzione
• File statici, come la cartella wwwroot degli applicativi web, non
vengono inclusi e vanno distribuiti a parte.

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.NET Standard 2.1
• Span<T>
• Index and Range
• IAsyncEnumerable<T>
• Reflection emit and capability APIs
• Hardware Intrinsics API [post]
• DbProviderFactories
• No support in full .NET Framework

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HTTP/2
var client = new HttpClient()
{
BaseAddress = new Uri("https://localhost:5001"),
DefaultRequestVersion = new Version(2, 0)
};
// HTTP/2 abilitato sul client
using var response = await client.GetAsync("/");
var client2 = new HttpClient();
// HTTP/2 abilitato sulla SINGOLA richiesta
using var request = new HttpRequestMessage(HttpMethod.Get, "/")
{ Version = new Version(2, 0) }
using var response = await client2.SendAsync(request)

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JSON
• System.Text.Json
• Utf8JsonReader
• Utf8JsonWriter
• JsonDocument
• JsonSerializer

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Microsoft.Data.SqlClient package
• 2 distinct System.Data.SqlClient code basis for Framework and Core
• Side-by-side execution
• .NET Standard (also for .NET Framework)

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Jupyter Notebooks with C#
• Based on dotnet-try
• Based on C# interactive
• Using C# in notebooks
• Spark//Databricks//C# scenario

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C# language evolution
• C# 1.0 was a new managed language
• C# 2.0 introduced generics
• C# 3.0 enabled LINQ
• C# 4.0 was all about interoperability with dynamic non-strongly typed languages.
• C# 5.0 simplified asynchronous programming with the async and await keywords.
• C# 6.0 the language has been increasingly shaped by conversation with the community,
now to the point of taking language features as contributions from outside Microsoft
• C# 7.x will be no exception, with tuples and pattern matching as the biggest features,
transforming and streamlining the flow of data and control in code. Point releases
• C# 7.1, 7.2, 7.3 Safe Efficient Code, More Freedom, Less Code
• C# 8.x (“unicorn”) running in the function path

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C# 7 objectives
•Working with data
• Pattern Matching
• Tuples
• Deconstruction
• Discards
•Code Simplification
• Expression Bodied Properties, Constructor Finalizer
• Throw expression
• Out Variables
• Binary Literals and Digit separator
•Improved Performances
• Local Functions
• Return values and local variables by reference

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What’s new in C# 8
• Default interface methods
• Pattern matching enhancements:
• Switch expressions
• Property patterns
• Tuple patterns
• Positional patterns
• Using declarations
• Static local functions
• Indices and ranges
• Null-coalescing assignment
• stackalloc in nested expressions

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Two more C# 8 enhancement
• Better to see with EF3.0

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Two more C# 8 enhancement
•Nullable reference types
• I call it my billion-dollar mistake (Tony Hoare)
• It’s a breaking change for the semantics of C#
•Asynchronous streams

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Entity Framework Core
• C# 8 support
• like async streams and nullable reference types
• EF 6.3 ported to .NET Core
• Lots of breaking changes
• LINQ improvements
• Cosmos DB support
• Microsoft.Data.SqlClient
• Database views reverse engineering
• using Query types Entities without keys
• EF Core no longer part of ASP.NET Core shared framework
• Targets .NET Standard 2.1

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What’s new in EF Core 3.0
• Relational SQL
• Nullable reference types
• LINQ overhaul
• New architecture
• Constrained client evaluation
• Single SQL query per LINQ query
• Reverse engineering of views
• Microsoft.Data.SqlClient
• Cosmos DB provider
• Async streams

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The .NET Desktop Development evolution

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Windows Desktop
Windows Desktop
• Windows Forms
• WPF
• UWP
• Open-source

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IoT in .NET Core 3
• Raspberry PI
• Windows 10 IoT Core

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Visual Studio Saturday 2019
Grazie!