Announcing .NET Native Preview

.NET Team

This post was written by Subramanian Ramaswamy and Andrew Pardoe, Senior Program Managers on the .NET Native team.

We’re thrilled to announce the first release of .NET Native. Windows Store apps start up to 60% faster with .NET Native and have a much smaller memory footprint. Our first release is a Developer Preview that allows you to develop and test apps with this new compiler. This preview release of .NET Native offers you the performance of C++ with the productivity of C#.  .NET Native enables the best of both worlds!

Download the .NET Native developer preview today and tell us what you think.  This developer preview currently enables building apps for Windows Store on ARM and x64 architectures (stay tuned for x86.) .NET Native will soon enable a consistent and converged experience across devices. Today’s preview supports Windows Store applications. We will continue to evolve and improve native compilation for the range of .NET applications.

.NET Native continues to provide a first-class .NET developer experience in Visual Studio. You still get a great edit/compile/debug environment with productivity enhancers like Edit and Continue and code refactoring. You continue to upload MSIL app packages to the Windows Store. Our compiler in the cloud compiles the app using .NET Native in the Store, creating a self-contained app package that’s customized to the device where the app will be installed.

.NET Native optimizes Store apps for device scenarios in all stages of compilation. We optimized the .NET Native runtime (a refactored and optimized CLR) to make apps start faster and consume less memory. The .NET Native compiler uses the world-class Microsoft VC++ optimizer back-end to make your app run faster. .NET Native libraries are refactored and optimized for Store apps. And .NET Native has the capability to link in library code your app uses into the app, allowing the optimizer to work globally across your app’s code and library code. In the end, your app is optimized for your user’s device, whatever platform, architecture, OS or form factor it might be running.  The end result –apps just get faster!

Some of the most popular Windows Store apps on Surface devices are already running on .NET Native. This includes applications such as Wordament and Fresh Paint, which are seeing multi-second startup wins.

Tune into the //BUILD conference for more details. Also, check out the Going Deep Channel 9 Video on .NET Native.

Getting started with .NET Native

The .NET Native developer preview installs on top of Visual Studio 2013 Update 2 RC.

Compiling with the .NET Native Toolchain

After your project is loaded, you can enable the .NET Native compiler. Make sure you’ve configured your app to compile for a specific architecture, x64 or ARM. .NET Native compiles to native code, so you need to target a real machine type instead of Any CPU. There are a few ways to do this—in the Solution Property Pages:


Or in the handy dropdowns at the top of the editor window:


Once you’ve selected a supported machine type you’re ready to enable your project for .NET Native compilation. Right-click on the project name and you’ll see the “Enable for .NET Native” option has appeared. (OK, it was always there, but if you selected it without selecting x64 or ARM you’d get an error.)


Selecting this actually causes a few things to happen. First, it creates a new file for your project called “default.rd.xml”. This file contains runtime directives that help the .NET Native compiler understand what metadata and type information needs to be preserved in order for your app to run correctly, so things like reflection mostly just work, even though you are statically compiling everything!


Second, selecting “Enable for .NET Native” builds your app. Visual Studio will also run a static analysis tool on your app to give a quick read on whether you are using any feature that’s not yet in the preview release. This will generate a “.NET Native Code Generation Compatibility Report” that will pop up with information about your app. Also, you can always rerun the static analysis from your project’s context menu.

If your app is like most Store apps, you’ll see this in the Compatibility Report, meaning you’re ready to test your app thoroughly with .NET Native.


If your app uses many complicated patterns or yet to be implemented features (e.g., WCF), you might instead get some workarounds and guidance. We’ll dive into each and every topic but for now if you run into any issues, please send us feedback, either in the .NET Native forum or by emailing us directly at

We look forward to hearing from you! Get the new VS Update, download the .NET Native Tools, start making your apps faster and tell us what you think!

Update: A number of the questions that have been asked in the comments are addressed in the .NET Native FAQ.



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