Does C# 8 Support .NET Framework, and What Are the Limitations?

Does C# 8 support .NET Framework?

Although there is no C# 8 option in the advanced build settings for .NET Framework projects in Visual Studio 2019, this does not mean that C# 8 does not support .NET Framework. You can enable C# 8 by manually modifying your project's csproj file and setting the language version to 8.0. However, it's important to note that some C# 8 features are only fully supported in .NET Core 3.0 and .NET Standard 2.1.

Supported features:

• Static local function
• using statement
• Null value merge assignment
• Read-only members
• Disposable ref structure
• Location Mode
• Tuple pattern
• switch expression
• Nullable reference types (partially supported)

Features that require Polyfills:

• Asynchronous streaming
• Indices and ranges

Unsupported features:

• Default interface members

Enable C# 8 in Visual Studio 2019:

For Visual Studio 2019 16.3 and above, the language selection drop-down menu has been disabled. However, you can still manually edit the .csproj file to force the language version to 8.

Detailed description:

Most C# language features are generally framework-agnostic. However, some C# 8 features rely on new types or CLR support that are not available in all .NET Framework versions. Therefore, Microsoft recommends using C# 8 only with frameworks that implement .NET Standard 2.1 or higher.

Use with caution:

While C# 8 can be used with the .NET Framework, it is important to acknowledge that this combination is not officially supported by Microsoft. Therefore, it is recommended to proceed with caution and only consider using unsupported features if you have the necessary expertise.

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