Can C# 8 Be Used with the .NET Framework?

Detailed explanation of compatibility between C# 8 and .NET Framework

Contrary to the screenshot in the question, C# 8 is actually compatible with the .NET Framework. To use C# 8 with the .NET Framework, just set the language version to 8.0 in the .csproj file.

Supported Features

Most C# 8 features, including static local functions, using declarations, and switch expressions, work correctly in the target framework.

Some supported features

Asynchronous streams and indexes/ranges require new types not found in the .NET Framework. However, these features can be enabled using "polyfill" NuGet packages or custom code files.

Unsupported feature

Default interface members are not supported and will never be compatible with the .NET Framework due to required runtime changes in the CLR.

Visual Studio 2019

In Visual Studio 2019 16.3 and above, the language selection dropdown menu has been disabled and C# 8 must be explicitly enabled in the .csproj file.

Notes

While C# 8 is technically compatible with the .NET Framework, some features may have limited support or require additional workarounds. We recommend caution and thorough testing of any C# 8 code targeting the .NET Framework.

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