Immo Landwerth

Program Manager, .NET

Immo Landwerth is a program manager on the .NET Framework team at Microsoft. He specializes in API design, the base class libraries (BCL), and .NET Standard. He works on base class libraries which represents the core types of the .NET platform, such as string and int but also includes collections and IO. He's involved with portable class libraries and works on shipping more framework components in an out-of-band fashion via NuGet.

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Survey: Library & Open Source

February 22nd, 2021
Are you an open source maintainer, contributor or consumer? Please help us to identify pain points and concerns so we can make your experience better!

The future of .NET Standard

September 15th, 2020
Since .NET 5 was announced, many of you have asked what this means for .NET Standard and whether it will still be relevant. In this post, I'm going to explain how .NET 5 improves code sharing and replaces .NET Standard. I'll also cover the cases where you still need .NET Standard.

Update on .NET Standard adoption

August 7th, 2019
It's about two years ago that I announced .NET Standard 2.0. Since then we've been working hard to increase the set of .NET Standard-based libraries for .NET. This includes many of the BCL components, such as the Windows Compatibility Pack, but also other popular libraries, such as the JSON.NET, the Azure SDK, or the AWS SDK. In this blog post...

Try the new System.Text.Json APIs

June 13th, 2019
For .NET Core 3.0, we're shipping a brand new namespace called System.Text.Json with support for a reader/writer, a document object model (DOM), and a serializer. In this blog post, I'm telling you why we built it, how it works, and how you can try it. We also have a video: Getting the new JSON library If you're targeting .NET...

Announcing .NET Standard 2.1

November 5th, 2018
Since we shipped .NET Standard 2.0 about a year ago, we've shipped two updates to .NET Core 2.1 and are about to release .NET Core 2.2. It's time to update the standard to include some of the new concepts as well as a number of small improvements that make your life easier across the various implementations of .NET. Keep reading to learn ...

Announcing the Windows Compatibility Pack for .NET Core

November 16th, 2017
Porting existing code to .NET Core used to be quite hard because the available API set was very small. In .NET Core 2.0, we already made this much easier, thanks to .NET Standard 2.0. Today, we're happy to announce that we made it even easier with the Windows Compatibility Pack, which provides access to an additional 20,000 APIs via a single...

Introducing API Analyzer

October 31st, 2017
This post was written by Olia Gavrysh. Have you ever wondered which APIs are deprecated and which should you use instead? Or have you ever used an API and then found out it didn't work on Mac or Linux? Have that ever happened to you too late when a major part of your code is already implemented and refactoring is way too hard? Both of ...

Announcing UWP Support for .NET Standard 2.0

October 10th, 2017
This post was mostly written by Rich Lander with contributions from Immo Landwerth. Today, we are releasing huge updates to UWP for .NET developers. The really big improvement is adding support for .NET Standard 2.0. UWP developers now have access to ~ 20k more APIs. This release brings UWP to partity with the other .NET implementations that...

UWP & .NET Standard 2.0: A preview is now available!

August 25th, 2017
Today, we released the first Preview of Visual Studio 2017 version 15.4. This includes an update to the UWP tooling that supports .NET Standard 2.0. In this post, I'll outline what this means for UWP development with .NET. Prerequisites In order to use .NET Standard 2.0 in UWP, you need to target Fall Creators Update (FCU) as the minimum ...
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Announcing .NET Standard 2.0

August 14th, 2017
The .NET Standard 2.0 specification is now complete. It is supported in .NET Core 2.0, in the .NET Framework 4.6.1 and later versions, and in Visual Studio 15.3. You can start using .NET Standard 2.0 today. While this post demos .NET Standard in C#, it's also supported in Visual Basic and F#. For more details, take a look at the .NET ...
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