Windows 10: Announcing .NET Core 3.0

Brink · Oct 15, 2019

We’re excited to announce the release of .NET Core 3.0. It includes many improvements, including adding Windows Forms and WPF, adding new JSON APIs, support for ARM64 and improving performance across the board. C# 8 is also part of this release, which includes nullable, async streams, and more patterns. F# 4.7 is included, and focused on relaxing syntax and targeting .NET Standard 2.0. You can start updating existing projects to target .NET Core 3.0 today. The release is compatible with previous versions, making updating easy.

Watch the team and the community talk about .NET at .NET Conf, live NOW!

You can download .NET Core 3.0, for Windows, macOS, and Linux:

.NET Core 3.0 SDK and Runtime

Snap installer

Docker images

ASP.NET Core 3.0 and EF Core 3.0 are also releasing today.

Visual Studio 2019 16.3 and Visual Studio for Mac 8.3 were also released today and are required update to use .NET Core 3.0 with Visual Studio. .NET Core 3.0 is part of Visual Studio 2019 16.3. You can just get .NET Core by simply upgrading Visual Studio 2019 16.3.

Thank you to everyone that contributed to .NET Core 3.0! Hundreds of people were involved in making this release happen, including major contributions from the community.

Release notes:

.NET Core 3.0 release notes

.NET Core 2.2 -> 3.0 API diff

.NET Core 3.0 contributor list

GitHub release

GitHub issue for .NET Core 3.0 issues

Note: There are some contributors missing from the contributor list. We’re working on fixing that. Send mail to L: [email protected] if you are missing.

What you should know about 3.0

There are some key improvements and guidance that are important to draw attention to before we go into a deep dive on all the new features in .NET Core 3.0. Here’s the quick punch list.

.NET Core 3.0 is already battle-tested by being hosted for months at dot.net and on Bing.com. Many other Microsoft teams will soon be deploying large workloads on .NET Core 3.0 in production.

Performance is greatly improved across many components and is described in detail at Performance Improvements in .NET Core 3.0.

C# 8 add async streams, range/index, more patterns, and nullable reference types. Nullable enables you to directly target the flaws in code that lead to NullReferenceException. The lowest layer of the framework libraries has been annotated, so that you know when to expect null.

F# 4.7 focuses on making some thing easier with implicit yield expressions and some syntax relaxations. It also includes support for LangVersion, and ships with nameof and opening of static classes in preview. The F# Core Library now also targets .NET Standard 2.0. You can read more at Announcing F# 4.7.

.NET Standard 2.1 increases the set of types you can use in code that can be used with both .NET Core and Xamarin. .NET Standard 2.1 includes types since .NET Core 2.1.

Windows Desktop apps are now supported with .NET Core, for both Windows Forms and WPF (and open source). The WPF designer is part of Visual Studio 2019 16.3. The Windows Forms designer is still in preview and available as a VSIX download.

.NET Core apps now have executables by default. In past releases, apps needed to be launched via the dotnet command, like dotnet myapp.dll. Apps can now be launched with an app-specific executable, like myapp or ./myapp, depending on the operating system.

High performance JSON APIs have been added, for reader/writer, object model and serialization scenarios. These APIs were built from scratch on top of Span<T> and use UTF-8 under the covers instead of UTF-16 (like string). These APIs minimize allocations, resulting in faster performance, and much less work for the garbage collector. See The future of JSON in .NET Core 3.0.

The garbage collector uses less memory by default, often a lot less. This improvement is very beneficial for scenarios where many applications are hosted on the same server. The garbage collector has also been updated to make better use of large numbers of cores, on machines with >64 cores.

.NET Core has been hardened for Docker to enable .NET applications to work predictably and efficiently in containers. The garbage collector and thread pool have been updated to work much better when a container has been configured for limited memory or CPU. .NET Core docker images are smaller, particularly the SDK image.

Raspberry Pi and ARM chips are now supported to enable IoT development, including with the remote Visual Studio debugger. You can deploy apps that listen to sensors, and print messages or images on a display, all using the new GPIO APIs. ASP.NET can be used to expose data as an API or as a site that enables configuring an IoT device.

.NET Core 3.0 is a ‘current’ release and will be superseded by .NET Core 3.1, targeted for November 2019. .NET Core 3.1 will be a long-term supported (LTS) release (supported for at least 3 years). We recommend that you adopt .NET Core 3.0 and then adopt 3.1. It’ll be very easy to upgrade.

.NET Core 2.2 will go EOL on 12/23 as it is now the previous ‘current’ release. See .NET Core support policy.

.NET Core 3.0 will be available with RHEL 8 in the Red Hat Application Streams, after several years of collaboration with Red Hat.

Visual Studio 2019 16.3 is a required update for Visual Studio users on Windows that want to use .NET Core 3.0.

Visual Studio for Mac 8.3 is a required update for Visual Studio for Mac users that want to use .NET Core 3.0.

Visual Studio Code users should just always use the latest version of the C# extension to ensure that the newest scenarios work, including targeting .NET Core 3.0.

Azure App Service deployment of .NET Core 3.0 is currently ongoing. See our tracking site to track when .NET Core 3.0 is available in your region.

Azure DevOps deployment of .NET Core 3.0 is coming soon. Will update when it is available.

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Read more: https://devblogs.microsoft.com/dotne...-net-core-3-0/

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Brink · Oct 15, 2019

Announcing .NET Core 3 Preview 2

.NET Core 3.0 Preview 2 is now available and it includes a bunch of new updates to ASP.NET Core.

Here's the list of what's new in this preview:

Razor Components

SignalR client-to-server streaming

Pipes on HttpContext

Generic host in templates

Endpoint routing updates

Get started

To get started with ASP.NET Core in .NET Core 3.0 Preview 2 install the .NET Core 3.0 Preview 2 SDK

If you're on Windows using Visual Studio, you'll also want to install the latest preview of Visual Studio 2019.

Upgrade an existing project

To upgrade an existing an ASP.NET Core app to .NET Core 3.0 Preview 2, follow the migrations steps in the ASP.NET Core docs.

Add package for Json.NET

As part of the work to tidy up the ASP.NET Core shared framework, Json.NET is being removed from the shared framework and now needs to be added as a package.

To add back Json.NET support to an ASP.NET Core 3.0 project:

Add a package reference to Microsoft.AspNetCore.Mvc.NewtonsoftJson

Update your ConfigureServices method to include a call to AddNewtonsoftJson().

services.AddMvc()
.AddNewtonsoftJson();

Runtime compilation removed

As a consequence of cleaning up the ASP.NET Core shared framework to not depend on Roslyn, support for runtime compilation of pages and views has also been removed in this preview release. Instead compilation of pages and views is performed at build time. In a future preview update we will provide a NuGet packages for optionally enabling runtime compilation support in an app.

Other breaking changes and announcements

For a full list of other breaking changes and announcements for this release please see the ASP.NET Core Announcements repo...
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Read more:

Announcing .NET Core 3 Preview 2 | .NET Blog

ASP.NET Core updates in .NET Core 3.0 Preview 2 | ASP.NET Blog

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Brink · Oct 15, 2019

Announcing .NET Core 3 Preview 2

.NET Core 3.0 Preview 2 is now available and it includes a bunch of new updates to ASP.NET Core.

Here's the list of what's new in this preview:

Razor Components

SignalR client-to-server streaming

Pipes on HttpContext

Generic host in templates

Endpoint routing updates

Get started

To get started with ASP.NET Core in .NET Core 3.0 Preview 2 install the .NET Core 3.0 Preview 2 SDK

If you're on Windows using Visual Studio, you'll also want to install the latest preview of Visual Studio 2019.

Upgrade an existing project

To upgrade an existing an ASP.NET Core app to .NET Core 3.0 Preview 2, follow the migrations steps in the ASP.NET Core docs.

Add package for Json.NET

As part of the work to tidy up the ASP.NET Core shared framework, Json.NET is being removed from the shared framework and now needs to be added as a package.

To add back Json.NET support to an ASP.NET Core 3.0 project:

Add a package reference to Microsoft.AspNetCore.Mvc.NewtonsoftJson

Update your ConfigureServices method to include a call to AddNewtonsoftJson().

services.AddMvc()
.AddNewtonsoftJson();

Runtime compilation removed

As a consequence of cleaning up the ASP.NET Core shared framework to not depend on Roslyn, support for runtime compilation of pages and views has also been removed in this preview release. Instead compilation of pages and views is performed at build time. In a future preview update we will provide a NuGet packages for optionally enabling runtime compilation support in an app.

Other breaking changes and announcements

For a full list of other breaking changes and announcements for this release please see the ASP.NET Core Announcements repo...
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Read more:

Announcing .NET Core 3 Preview 2 | .NET Blog

ASP.NET Core updates in .NET Core 3.0 Preview 2 | ASP.NET Blog

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Brink · Oct 15, 2019

Announcing .NET Core 2.2 Preview 3

Today, we are announcing .NET Core 2.2 Preview 3. We have made more improvements to the overall release that we would love to get your feedback on, either in the comments or at dotnet/core #2004.

ASP.NET Core 2.2 Preview 3 and Entity Framework 2.2 Preview 3 were also released today.

You can see more details of the release in the .NET Core 2.2 Preview 3 release notes. Related instructions, known issues, and workarounds are included in the releases notes. Please report any issues you find in the comments or at dotnet/core #2004.

Please see the .NET Core 2.2 Preview 2 post to learn more about the new features coming with .NET Core 2.2.
Thanks for everyone that contributed to .NET Core 2.2. You’ve helped make .NET Core a better product!

Download .NET Core 2.2

You can download and get started with .NET Core 2.2, on Windows, macOS, and Linux:

.NET Core 2.2 Preview 3 SDK (includes the runtime)

.NET Core 2.2 Preview 3 Runtime

Docker images are available at microsoft/dotnet for .NET Core and ASP.NET Core.

.NET Core 2.2 Preview 3 can be used with Visual Studio 15.9 Preview 3 (or later), Visual Studio for Mac and Visual Studio Code.

Platform Support

.NET Core 2.2 is supported on the following operating systems:

Windows Client: 7, 8.1, 10 (1607+)

Windows Server: 2008 R2 SP1+

macOS: 10.12+

RHEL: 6+

Fedora: 27+

Ubuntu: 14.04+

Debian: 8+

SLES: 12+

openSUSE: 42.3+

Alpine: 3.7+

Chip support follows:

x64 on Windows, macOS, and Linux

x86 on Windows

ARM32 on Linux (Ubuntu 18.04+, Debian 9+)

Closing

Please download and test .NET Core 2.2 Preview 3. We’re looking for feedback on the release with the intent of shipping the final version later this year.
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Source: Announcing .NET Core 2.2 Preview 3 | .NET Blog

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Windows 10: Announcing .NET Core 3.0

Announcing .NET Core 3.0

Announcing .NET Core 3.0

Announcing .NET Core 3.0

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