What's new in C# 11 - C# Guide | Microsoft Docs

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These are currently preview features. You must set <LangVersion> to preview to enable these features. Any feature may change before its final release. These features may not all be released in C# 11. Some may remain in a preview phase for longer based on feedback on the feature.

The following features are available in the 6.0.200 version of the .NET SDK. They're available in Visual Studio 2022 version 17.2.

You can download the latest .NET 6 SDK from the .NET downloads page. You can also download Visual Studio 2022, which includes the .NET 6 SDK. You can also try all these features with the preview release of the .NET 7 SDK, which can be downloaded from the all .NET downloads page.

You can declare a generic class whose base class is System.Attribute. This provides a more convenient syntax for attributes that require a System.Type parameter. Previously, you'd need to create an attribute that takes a Type as its constructor parameter: