| ylbtech-.Net Core-3.0-新闻：宣告推出.NET Core 3.0 Preview 7 |
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今天，我们宣布推出.NET Core 3.0 Preview 7。我们已经从创建新特性阶段过渡到了完善版本阶段。对于接下来的预览版，我们将把重点放在质量(改进)上。
在Windows，macOS和Linux上下载.NET Core 3.0 Preview 7。
- .NET Core 3.0发行说明
- API差异
- GitHub发布
- 报告问题
ASP.NET Core和EF Core今天也在发布更新。
Visual Studio用户需要Visual Studio 2019 16.3 Preview 1（将于本周晚些时候发布）才能使用.NET Core 3.0 Preview 7。
Microsoft .NET 网站已经更新到了.NET 3.0 Preview 7（请参阅网站底部显示的版本）。在Azure WebApps上（作为一个独立的应用程序），它已经在预览7上成功运行了两周多。我们可能会在几周内将这个站点迁移到预览8版本。
为了防止错过一些更新，可以查看我们在.NET Core 3.0 Preview 6和WPF 6月更新中发布的改进，这两处更新都是在上个月发布的。
上线
.NET Core 3.0 Preview 7由微软支持，并可用于生产。我们强烈建议您在将应用部署到生产环境之前，测试好基于Preview 7上运行的应用程序。如果您发现.NET Core 3.0存在问题，请提交GitHub Issue或联系Microsoft支持。
对于大多数API，我们打算在预览7之后只进行少量更改。其余API，尤其是：WPF，Windows Forms，Blazor和Entity Framework。将Preview 7之后的任何重大更改都会记录在案。
我们正在努力确保与.NET Core 1.x和2.x应用程序的高度兼容性，从而可以直接将现有应用程序升级到.NET Core 3.0。
.NET Core SDK大小改进
.NET Core SDK中.NET Core 3.0 SDK要明显更小。主要原因是我们改变了构建SDK的方式，转而使用各种特定的“包”（引用程序集，框架，模板）。在以前的版本（包括.NET Core 2.2）中，我们使用NuGet包构建SDK，其中包含许多不需要而且浪费了大量空间的组件。
您可以在.NET Core 3.0 SDK Size Improvements要点中看到我们如何计算这些文件大小。（我们）提供了详细说明，以便您可以在自己的环境中运行相同的测试。
.NET Core 3.0 SDK大小（括号中是大小更改）
| 操作系统 | 安装程序大小（更改） | 磁盘大小（更改） |
| Windows | 164MB (-440KB; 0%) | 441MB (-968MB; -68.7%) |
| Linux | 115MB（-55MB; -32％） | 332MB（-1068MB; -76.2％） |
| macOS | 118MB（-51MB; -30％） | 337MB（-1063MB; -75.9％） |
Linux和macOS的大小改进是巨大的。Windows的改进较小，因为我们已将WPF和Windows Forms添加到了.NET Core 3.0中。令人惊讶的是，即便我们在3.0中添加了WPF和Windows Forms，其安装程序仍然（稍微）小一些。
您可以通过.NET Core SDK Docker映像看到相同的好处（此处仅限于x64 Debian和Alpine）。
| 发行版 | 2.2压缩尺寸 | 3.0压缩尺寸 |
| Debian | 598MB | 264MB |
| Alpine | 493MB | 148MB |
.NET Core 3.0版本即将完成，我们不再构建新功能，因而团队专注于其稳定性和可靠性。请尽快告诉我们您发现的任何问题。我们希望在发布3.0最终版本之前尽可能多地修复。
我们建议您开始计划采用.NET Core 3.0。如果您使用容器，那就更应该采用.NET Core 3.0。3.0关于容器方面的改进对于直接或通过协调器使用docker资源限制的任何人都至关重要。
如果您安装日常构建，请阅读.NET Core主分支上的重要PSA 。
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Announcing .NET Core 3.0 Preview 7
Richard
Today, we are announcing .NET Core 3.0 Preview 7. We’ve transitioned from creating new features to polishing the release. Expect a singular focus on quality for the remaining preview releases.
Download .NET Core 3.0 Preview 7 right now on Windows, macOS and Linux.
ASP.NET Core and EF Core are also releasing updates today.
Visual Studio users need Visual Studio 2019 16.3 Preview 1 to use .NET Core 3.0 Preview 7.
The Microsoft .NET Site has been updated to .NET Core 3.0 Preview 7 (see the version displayed in the website footer). It’s been running successfully on Preview 7 for over two weeks, on Azure WebApps (as a self-contained app). We will likely move the site to Preview 8 builds in a couple of weeks.
ICYMI, check out the improvements we released in .NET Core 3.0 Preview 6 and the June Update on WPF, both from last month.
Go Live
NET Core 3.0 Preview 7 is supported by Microsoft and can be used in production. We strongly recommend that you test your app running on Preview 7 before deploying Preview 7 into production. If you find an issue with .NET Core 3.0, please file a GitHub issue and/or contact Microsoft support.
We intend to make very few changes after Preview 7 for most APIs. Notable exceptions are: WPF, Windows Forms, Blazor and Entity Framework. Any breaking changes after Preview 7 will be documented.
We are working to ensure a high degree of compatibility with .NET Core 1.x and 2.x apps, making it straightforward to upgrade existing apps to .NET Core 3.0.
.NET Core SDK Size Improvements
The .NET Core SDK is significantly smaller with .NET Core 3.0. The primary reason is that we changed the way we construct the SDK, by moving to purpose-built “packs” of various kinds (reference assemblies, frameworks, templates). In previous versions (including .NET Core 2.2), we constructed the SDK from NuGet packages, which included many artifacts that were not required and wasted a lot of space.
You can see how we calculated these file sizes in the .NET Core 3.0 SDK Size Improvements gist. Detailed instructions are provided so that you can run the same tests in your own environment.
.NET Core 3.0 SDK Size (size change in brackets)
| Operating System | Installer Size (change) | On-disk Size (change) |
|---|---|---|
| Windows | 164MB (-440KB; 0%) | 441MB (-968MB; -68.7%) |
| Linux | 115MB (-55MB; -32%) | 332MB (-1068MB; -76.2%) |
| macOS | 118MB (-51MB; -30%) | 337MB (-1063MB; -75.9%) |
The size improvements for Linux and macOS are dramatic. The improvement for Windows is smaller because we have added WPF and Windows Forms as part of .NET Core 3.0. It’s amazing that we added WPF and Windows Forms in 3.0 and the installer is still (a little bit) smaller.
You can see the same benefit with .NET Core SDK Docker images (here, limited to x64 Debian and Alpine).
| Distro | 2.2 Compressed Size | 3.0 Compressed Size |
|---|---|---|
| Debian | 598MB | 264MB |
| Alpine | 493MB | 148MB |
Closing
The .NET Core 3.0 release is coming close to completion, and the team is solely focused on stability and reliability now that we’re no longer building new features. Please tell us about any issues you find, ideally as quickly as possible. We want to get as many fixes in as possible before we ship the final 3.0 release.
We recommend that you start planning to adopt .NET Core 3.0. This recommendation is stronger if you are using containers. The 3.0 improvements for containers are critical for anyone using docker resource limits directly or via an orchestrator.
If you install daily builds, please read an important PSA on .NET Core master branches.
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作者：ylbtech 出处：http://ylbtech.cnblogs.com/ 本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。 |