.NET 5 - What you need to know about the latest .NET  

Today, we’re releasing .NET 5.0 Preview 3. It contains a set of new features and performance improvements. We’re continuing to work on the bigger features that will define the 5.0 release. 

var numbers1_CS11 = new[] { 1, 2, 3 };

var numbers1_CS_11 = new int[] { 1, 2, 3 };

int[] numbers1_CS12 = [ 1, 2, 3 ];

error CS9176: There is no target type for the collection expression.

Span<string> span1_CS11 = new string[] { "AC", "AL" };

Span<string> span1_CS12 = [ "AC", "AL" ];

ReadOnlySpan<string> readOnlySpan_CS12 = [ "Africa",  "Asia", "Europa"];

int[][] array2D_CS11 =
  {
    new int[] { 2002, 2006, 2010},
    new int[] { 2014, 2018},
    new int[] { 2022, 2026, 2030}
  };

int[][] array2D_CS12 =
  [
     [2002, 2006, 2010],
     [2014, 2018],
     [2022, 2026, 2030]
  ];

List<string> list_CS11 = new List<string> { "Item 1", "Item 2" };

List<string> list_CS12 = [ "Item 1", "Item 2" ];

// Before C#12
List<User> users = new List<User>();
// or
var users = new List<User>();
// or
List<User> user = new();

// C#12
List<User> users = [];

int[] numbers1_CS12 = [ 1, 2, 3 ];
int[] numbers2_CS12 = [ 4, 5, 6 ];

int[] allItems = [ ..numbers1_CS12, ..numbers2_CS12 ];

int[] allItems_CS11 = numbers1_CS12.Concat(numbers2_CS12).ToArray();

int[] join = [..a, ..b, ..c, 6, 5];

int[] a =[1, 2, 3];
Span<int> b = [2, 4, 5, 4, 4];
List<int> c = [4, 6, 6, 5];

List<int> join = [..a, ..b, ..c, 6, 5];

List<(string, int)> otherScores = [("Dave", 90), ("Bob", 80)];

(string name, int score)[] scores = [("Alice", 90), ..otherScores, ("Charlie", 70)];

As part of our .NET unification, Xamarin.iOS and Xamarin.Android will become part of .NET 6 as .NET for iOS and .NET for Android. Because these bindings are projections of the SDKs shipped from Apple and Google, nothing changes there, however build tooling, target framework monikers, and runtime framework monikers will be updated to match all other .NET 6 workloads. Our commitment to keeping .NET developers up-to-date with the latest mobile SDKs is foundational to .NET MAUI and remains firm. When .NET 6 ships, we expect to ship a final release of Xamarin SDKs in their current form that will be serviced for a year. All modern work will at that time shift to .NET 6. 

At Build 2019, Microsoft announced the release date for .NET Core 3.0 to be this coming September. This release includes the highly touted support for desktop platforms like WinForms and WPF. Today, there’s still a large developer base that’s building desktop applications using these .NET Windows desktop frameworks and by using .NET Core 3.0, you can now build desktop applications on the .NET Core platform. 

MySQL Connector/Net 7.0.4 is the first development release that expands
cross-platform support to Linux and OS X when using Microsoft's .NET Core
framework. 

MVC in .NET 8
13 Videos
 

Exploring new Blazor features in .NET 8.0 

ASP.NET Core Roadmap for .NET 8