Announcing .NET Core 3.1 Preview 3

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Richard

Today, we’re announcing .NET Core 3.1 Preview 3. .NET Core 3.1 is a small and short release focused on key improvements in Blazor and Windows desktop, the two big additions in .NET Core 3.0.. It will be a long term support (LTS) release. We are coming near the end of the 3.1 release and expect to release it in early December.

You can download .NET Core 3.1 Preview 3 on Windows, macOS, and Linux.

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

Visual Studio 16.4 Preview 5 and Visual Studio for Mac 8.4 Preview 2 are also releasing today. They are required updates to use .NET Core 3.1 Preview 3. Visual Studio 16.4 includes .NET Core 3.1, so just updating Visual Studio to 16.4 Preview 5 will give you the latest version of both products.

Details:

Go Live

This release is supported in production and you can call Microsoft support with issues.

The dotnet.microsoft.com site (see version in footer) has been running .NET Core 3.1 in production since Preview 1 without issue and will be updated to Preview 3 shortly. We are confident about the quality of the release.

Closing

The primary goal of .NET Core 3.1 is to polish the features and scenarios we delivered in .NET Core 3.0. .NET Core 3.1 will be a long term support (LTS) release, supported for at least 3 years.

The initial download numbers for .NET Core 3.0 are even higher than we expected. We guess that 80-90% (or even higher) of the .NET Core ecosystem will move to .NET Core 3.1 within the first 6 months of the release. We are encouraging everyone to move to the 3.1 release as soon as they can, given that it has a lot of improvements (largely via 3.0) and is the newest LTS release.

Please install and test .NET Core 3.1 Preview 3 and give us feedback.

If you missed it, check out the .NET Core 3.0 announcement from earlier this year.

16 comments

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  • Nick
    Nick

    Despite Windows Desktop being one of the “big additions in .Net Core 3.0” there’s still no new previews of the WinForms Designer? Is the Designer not scheduled to land until .Net 5 or something? We don’t even have a preview 0.2 yet.

    • Avatar
      Abul Hasan Lakhani

      I agree. I have the same concern.. there was no mention of the designer support in any of the talks at the recent MS Ignite 2019.

      • Olia Gavrysh
        Olia GavryshMicrosoft employee

        There actually was! Designer Preview 2 is out and available with the latest Visual Studio Preview. You need to enable it by checking the check box in Tools->Options->Preview Features

        • Nick
          Nick

          Am I looking at the wrong place?

          https://github.com/dotnet/winforms/tree/master/Documentation/designer-releases/

          There is no, 0.2 folder there… is there somewhere else I can get info on what’s new? We don’t have preview 0.1 installed because it’s missing core functionality we need, namely Containers and Resource Files. We’re watching closely (or trying to anyway) to see when those make it in as we are aware that .Net Core 3.x -> .Net 5 is the future of even WinForms development.

  • Avatar
    Timothy Liu

    .NET Core is perfect, but it’s still not attractive enough to new developers, especially to those who believe algorithms is important than engineering. So, do we have a schedule when .NET Core SDK can have the built-in PriorityQueue 😉

  • Avatar
    Rolf Kristensen

    Will NetCore 3.1 fix single-file-publish so AppDomain.BaseDirectory matches Process.GetCurrentProcess().MainModule.FileName ?

    See also: https://github.com/dotnet/core-setup/issues/7491

    Right now it ruins the illusion of single-file-publish as AppDomain.BaseDirectory points to a “random” temporary directory.

  • Avatar
    John Tsombakos

    Doesn’t look like Visual Studio for Mac 8.4 Preview 5 is actually available – no updates are showing, and the page is not showing that version. Any word when it will be available?

    • Avatar
      Severin, Dale

      It says in this blog: This release is supported in production and you can call Microsoft support with issues. Is this a GA release?

  • Felix Rabinovich
    Felix Rabinovich

    Everything I read about .NET Core 3 makes me want to upgrade from Core 2 immediately! However, absent some significant changes from Microsoft, it will probably be years! :'( We probably have hundreds of places that EF 2 gave a warning, but EF 3 throws an exception. “Probably” because there is no way to find out, other then during runtime. And unit tests are useless as well. And I just had a conversation with another architect whose organization has exactly same problem.

    I realize, my gripe is about EF, but we are not going to upgrade the rest of .NET Core (even if it is possible) leaving EF behind. Very depressing!

    • Avatar
      Basil Thomas

      Yes…you hit the nail on the head: EF is total crap!!
      Should use something like Dapper for a very lightweight ORM especially if you are moving over to a Microservices based architecture.
      Last used EF @ version 4.2 and way too many problems in production.
      Have not looked back since and simple ORM libraries are the way to go especially if you like only use stored procedures and/or the full features available in SQL.

      I have been using .Net Core since 2.1 and will definitely be upgrading to 3.0 once they have production design tools for WinForms, WPF and WinUI in VS2019

    • Avatar
      Ian Marteens

      Depressing, indeed. EF is not ready for prime time. It was obvious a couple of months ago.

  • Avatar
    东杰 王

    Is there have a roadmap when will dotnet core 3 support for visual studio 2017 ?