原生代碼(native code)

Native code is the code whose memory is not "managed", as in, memory isn't freed for you (C++' delete and C's free, for instance), no reference counting, no garbage collection. Managed code, you guessed it, is the code whose memory is free and allocated for you, garbage collection and other goodies.

Native code is compiled to work directly with the OS. Managed code however, is precompiled (bytecode in Java-speak) but is then processed by the Just In Time Compiler(這就是Java的JIT編譯器) to native code at runtime. Managed code has the interesting side effect of having the potential of running on different operating systems, because the machine code is not created until the VM actually uses it. This way, you are able to run .NET apps on Windows and also run them on Linux or Mac that have the Mono runtime installed. The portability is not as clean currently as Java is (because of Microsoft's naturally closed architecture), but the concept remains.

If you are running an unmanaged app, the code has been compiled to run for the designated OS/Hardware. Any portability to another OS/instruction set is lost and must be recompiled to execute.

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