关于C#语言版本跨框架支持性及C# 8.0兼容范围的技术咨询

Hey there, let's unpack your questions about C# version support step by step:

Understanding the C# 8.0 Framework Support Statement #

First, let's clear up the confusion around that official docs line:

"C# 8.0 is supported only on .NET Core 3.x and newer versions"

This means C# 8.0 requires a minimum framework version of .NET Core 3.x — it does NOT mean it only works on .NET Core 3.x. All newer .NET releases (like .NET 5, 6, 7, 8, etc.) fully support C# 8.0, since they're part of the unified .NET platform that succeeded .NET Core. You can absolutely use C# 8.0 features (like nullable reference types, pattern matching enhancements) in a .NET 6 project, for example.

Can C# Versions Run on Non-Native Frameworks? #

Great question! C# is deeply tied to the .NET ecosystem, but there are scenarios where it can run on alternative .NET-based runtimes (often referred to as non-"native" in this context):

• Unity Engine: Unity uses a customized Mono runtime, which supports specific C# versions based on your editor release — for example, Unity 2022 supports up to C# 10.
• .NET MAUI/Xamarin: These cross-platform frameworks are built on .NET (previously Mono) and align their C# version support with the underlying .NET runtime.
• Blazor WebAssembly: Runs C# code directly in browsers via a WebAssembly-compiled .NET runtime, supporting modern C# versions.

That said, legacy frameworks like the Windows-only .NET Framework have strict limits on C# support — it tops out at C# 7.3, since .NET Framework is no longer receiving major updates. You can't use C# 8.0+ features in a .NET Framework project.

内容的提问来源于stack exchange，提问作者Matin Malik