C#是否依赖Runtime Environment？与C/C++开发模式有何区别？

Great question—this is a key distinction that trips up a lot of folks moving from C/C++ to C#. Let's break it down clearly:

First off, yes—C# absolutely uses a Runtime Environment (the .NET Runtime, specifically CoreCLR for modern cross-platform .NET 5+ or the legacy CLR for .NET Framework). This runtime isn't just an extra layer; it's core to how C# operates:

• It handles automatic memory management via garbage collection (so you don't have to deal with manual free/delete like in C/C++).
• When you compile C# code, you don't get native machine code right away—you generate Intermediate Language (IL), a platform-agnostic bytecode. The runtime uses Just-In-Time (JIT) compilation to convert that IL to native machine code on the fly when your app runs. (Newer .NET versions also support Native AOT, which compiles IL directly to native code upfront, but this is an optional feature, not the default.)
• It enforces type safety, manages exception handling, and provides other runtime services that make C# a safer, more productive language compared to C/C++.

That said, C# still relies on a toolchain just like C/C++—they're not mutually exclusive:

• The C# compiler (csc for .NET Framework, or dotnet build for modern .NET) comes bundled with the .NET SDK.
• IDEs like Visual Studio, Rider, or VS Code with the C# extension wrap these tools, giving you debugging, IntelliSense, and project management features out of the box—similar to how Visual Studio or CLion works for C/C++.
• .NET includes a robust standard library (think System.Collections, System.IO, etc.) that's comparable to C/C++'s STL or standard library headers.

C/C++ works without a dedicated runtime environment:

• You compile source code directly to native machine code using compilers like GCC, Clang, or MSVC.
• The resulting executable runs directly on the operating system, with no intermediary layer managing memory or execution. This means you're fully responsible for manual memory management, and there's no built-in safety net for issues like type errors or memory leaks.
• You still need a compiler, debugger, and libraries (like the STL) to build and debug C/C++ apps—just no runtime environment overseeing execution.

内容的提问来源于stack exchange，提问作者JAYD3V