Windows 10: Announcing .NET 5.0 Preview 3 now available

Brink · Apr 25, 2020

Today, weâre releasing .NET 5.0 Preview 3. It contains a set of new features and performance improvements. Weâre continuing to work on the bigger features that will define the 5.0 release. The .NET 5.0 Preview 1 post covers what we are planning on building for .NET 5.0. Please take a look at the post and the dotnet/designs repository and share any feedback you have. And, of course, please install Preview 3, and test your workloads with it.

You can download .NET 5.0 Preview 3, for Windows, macOS, and Linux:

.NET 5.0 Preview 3 and Runtime

Docker images

Snap installer

ASP.NET Core and EF Core are also being released today.

You need to use Visual Studio 2019 16.5 to use .NET 5.0. Install the latest version of the C# extension, to use .NET 5.0 with Visual Studio Code. .NET 5.0 isnât yet supported with Visual Studio for Mac.

Release notes:

.NET 5.0 Preview 3 release notes

.NET 5.0 known issues

GitHub tracking issue

Letâs look at some of the improvements in Preview 3.

Code quality improvements in RyuJIT

Every release includes a set of changes that improve the machine code that the JIT generates (we call this âcode qualityâ&#157. Better code quality means better application performance.

Vectorise BitArray for ARM64 â dotnet/runtime #33749 â The BitArray class was updated to include a hardware-accelerated implementation for ARM64 using ARM64 intrinisics. The performance improvements for BitArray are very significant. Credit to @Gnbrkm41.

Implement simple version of On Stack Replacement (OSR) â dotnet/runtime #32969. On-stack replacement (OSR) is a new capability that allows the code executed by currently running methods to be changed in the middle of method execution, while those methods are active âon stackâ. This feature is currently experimental and opt-in (on x64), and targeted at improving the more challenging performance characteristics of tiered compilation. Please try it out and give us feedback.

Dynamic generic dictionary expansion feature dotnet/runtime #32270 â Some (maybe many) uses of generics now have better performance (initial performance findings), based on improving the implementation of low-level (native code) dictionaries used by the runtime to store information about generic types and methods. See Perf: Collection Count() is Slower in Core than the CLR for more information. Credit to @RealDotNetDavefor the bug report.

Implement Vector.Ceiling / Vector.Floor dotnet/runtime #31993 â Implement Vector.Ceiling / Vector.Floor using x64 and ARM64 intrinsics, per API proposal. Credit to @Gnbrkm41.

JIT: allow CORINFO_HELP_READYTORUN_GENERIC_HANDLE to be optimized dotnet/runtime #34221. Improves code quality for generics in Ready2Run images.

JIT: enable tail calls and copy omission for implicit byref structs #33004. Improves code quality for structs as arguments in âtail callâ position calls.

System.Text.Json improvements

Add support for preserve references on JSON dotnet/runtime #655 â Enables ReferenceLoopHandling, which is one of the key features of JSON.NET serialization.

Add new System.Net.Http.Json project/namespace dotnet/runtime #33459 â Adds new extension methods for HttpClient that allow serialization from/to JSON.

Add JsonConstructor and support for deserializing with parameterized ctors dotnet/runtime #33444 â Adds support for immutable classes and structs to JsonSerializer.

Add JsonIgnoreCondition & per-property ignore logic #34049 â Adds support for null value handling, which is another feature of JSON.NET serialization.

.NET SDK Support for .NET Framework Assemblies

The .NET SDK will now auto-reference the Microsoft.NETFramework.ReferenceAssemblies NuGet package given a .NET Framework target framework in a project file. This change enables building .NET Framework projects on a machine without the required .NET Framework targeting pack installed. This improvement is specific to targeting packs, and doesnât account for other dependencies that a project may have.

Closing

Please take a moment to try out Preview 3, possibly in a container, a VM. Weâd like your feedback on the quality of the release. There is a lot more coming, over the next several months, leading up a November release.

Richard Lander
Program Manager, .NET Team
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Source: https://devblogs.microsoft.com/dotne...5-0-preview-3/

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Brink · Apr 25, 2020

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 · Apr 25, 2020

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 · Apr 25, 2020

Announcing .NET Core 3.0 Preview 5

Today, we are announcing .NET Core 3.0 Preview 5. It includes a new Json serializer, support for publishing single file executables, an update to runtime roll-forward, and changes in the BCL. If you missed it, check out the improvements we released in .NET Core 3.0 Preview 4, from last month.

Download .NET Core 3.0 Preview 5 right now on Windows, macOS and Linux.

ASP.NET Core and EF Core are also releasing updates today.
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Read more: Announcing .NET Core 3.0 Preview 5 | .NET Blog

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Windows 10: Announcing .NET 5.0 Preview 3 now available

Announcing .NET 5.0 Preview 3 now available

Announcing .NET 5.0 Preview 3 now available

Announcing .NET 5.0 Preview 3 now available

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