Welcome to the .NET Framework 4.7.1 Early Access!

Last Updated: 9/28/2017

Today, we are happy to share the .NET Framework 4.7.1 Early Access build with the Developer Pack. The .NET Framework 4.7.1 Developer Pack lets developers build applications that target the .NET Framework 4.7.1 by using Visual Studio 2017, Visual Studio 2015 or other IDEs. This is a single package that bundles the .NET Framework 4.7.1, the .NET 4.7.1 Targeting Pack, and the .NET Framework 4.7.1 SDK. The .NET Framework 4.7.1 is the next version of the .NET Framework. It is currently feature-complete and in the testing phase. We are asking for individuals and companies to help validate the quality and compatibility of the release. It is not ready for production and is not supported. The current build of the .NET Framework 4.7.1 being shared is build 2539.

The main difference between the build we shared few weeks back 2538 and this build we are sharing now is we are making the Developer Pack available in this build. This pre-release build enables you to try out the new features available in .NET Framework 4.7.1.

You can install .NET Framework 4.7.1 Early Access:

Go to the .NET Framework Early Access site
Review, accept the pre-release license terms and download the current build.
Provide your feedback by reporting an issue at the .NET Framework Early Access GitHub repository.

This pre-release build of .NET Framework 4.7.1 includes improvements in several areas. You can learn more about these features by going to the respective feature blog posts linked in the following list.

You can see the complete list of improvements on this build in the release notes.

The .NET Framework 4.7.1 will replace any existing .NET Framework 4 and later installation on your machine. This means all .NET Framework 4 and later applications on your machine will run on the .NET Framework early access builds upon installation. That’s great for testing, but a potential problem for production workloads (at this stage in the release).

Applicable Operating System Platforms

The build being shared installs on the following client operating systems:

Windows 10 Anniversary Update
Windows 8.1
Windows 7 SP1

It also installs on the following server platforms:

Windows Server 2016
Windows Server 2012 R2
Windows Server 2012
Windows Server 2008 R2 SP1

The .NET Framework 4.7.1 is also included in the next update for Windows 10. You can sign up for Windows Insiders to validate that your applications work great on the latest .NET Framework included in the latest Windows 10 releases.

Closing

Thanks for trying out this pre-release build of .NET Framework 4.7.1. Do let us know what you think. Your feedback is valuable and helps shape a high quality product release. Further details on installing the build and additional information can be found on the .NET Framework Early Access GitHub site.

Update 9/13/2017 – Share the .NET Framework 4.7.1 Developer Pack in build 2539 and links to feature overview for ASP.NET, Configuration and System.Messaging areas.

Update 9/21/2017 – Links to accessibility and WPF improvements blogpost.

Update 9/28/2017 – Links to Runtime and Compiler features blogpost.

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