Windows 10: Announcing .NET Core 3 Preview 2

Brink · Jan 29, 2019

.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 · Jan 29, 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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Brink · Jan 29, 2019

Announcing .NET Core 2.2 Preview 2

Today, we are announcing .NET Core 2.2 Preview 2. We have great improvements that we want to share and that we would love to get your feedback on, either in the comments or at dotnet/core #1938.

ASP.NET Core 2.2 Preview 2 and Entity Framework 2.2 Preview 2 are also releasing today. We are also announcing C# 7.3 and ML.NET 0.5.

You can see complete details of the release in the .NET Core 2.2 Preview 2 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 #1938.

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 2 SDK (includes the runtime)

.NET Core 2.2 Runtime

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

.NET Core 2.2 Preview 2 can be used with Visual Studio 15.8, Visual Studio for Mac and Visual Studio Code.

Tiered Compilation Enabled

The biggest change in .NET Core 2.2 Preview 2 is tiered compilation is enabled by default. We announced that tiered compilation was available as part of the .NET Core 2.1 release. At that time, you had to enable tiered compilation via application configuration or an environment variable. It is now enabled by default and can be disabled, as needed.

You can see the benefit of tiered compilation in the image below. The baseline is .NET Core 2.1 RTM, running in a default configuration, with tiered compilation disabled. The second scenario has tiered compilation. You can see a significant request-per-second (RPS) throughput benefit with tiered compilation enabled.

The numbers in the chart are scaled so that baseline always measures 1.0. That approach makes it very easy to calculate performance changes as a percentage. The first two tests are TechEmpower benchmarks and the last one is Music Store, our frequent sample ASP.NET app.

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 2. We’re looking for feedback on the release with the intent of shipping the final version later this year.

We recently shared how Bing.com runs of .NET Core 2.1. The Bing.com site experienced significant benefits when it moved to .NET Core 2.1. Please do check out that post if you are interested in case study of running .NET Core in production. You may also want to take a look at the .NET Customers site, if you are interested in a broader set of customer stories.
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Source: Announcing .NET Core 2.2 Preview 2 | .NET Blog

Brink · Jan 29, 2019

Announcing .NET Core 2.1

We’re excited to announce the release of .NET Core 2.1. It includes improvements to performance, to the runtime and tools. It also includes a new way to deploy tools as NuGet packages. We’ve added a new primitive type called Span<T> that operates on data without allocations. There are many other new APIs, focused on cryptography, compression, and Windows compatibility. It is the first release to support Alpine Linux and ARM32 chips. You can start updating existing projects to target .NET Core 2.1 today. The release is compatible with .NET Core 2.0, making updating easy.

ASP.NET Core 2.1 and Entity Framework Core 2.1 are also releasing today.

You can download and get started with .NET Core 2.1, on Windows, macOS, and Linux:

.NET Core 2.1 SDK (includes the runtime)

.NET Core 2.1 Runtime

.NET Core 2.1 is supported by Visual Studio 15.7, Visual Studio for Mac and Visual Studio Code.

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

The Build 2018 conference was earlier this month. We had several in-depth presentations on .NET Core. Check out Build 2018 sessions for .NET on Channel9.

You can see complete details of the release in the .NET Core 2.1 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 #1614

Thanks for everyone that contributed to .NET Core 2.1. You’ve helped make .NET Core a better product!
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Read more: Announcing .NET Core 2.1 | .NET Blog

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