Difference between managed and unmanaged

Question

I hear read about it sometimes when talking about  NET  for example  managed code  and  unmanaged code  but I have no idea what they are and what are their differences  What are their difference  by definition  What are the consequences of using either of them  Does this distinction exist in  NET Windows only

User · Answer

This is more general than  NET and Windows  Managed is an environment where you have automatic memory management  garbage collection  type safety      unmanaged is everything else  So for example  NET is a managed environment and C C   is unmanaged

User · Answer

Managed Code  Managed code is what Visual Basic  NET and C  compilers create  It runs on the CLR  Common Language Runtime   which  among other things  offers services like garbage collection  run-time type checking  and reference checking  So  think of it as   My code is managed by the CLR    Visual Basic and C  can only produce managed code  so  if you re writing an application in one of those languages you are writing an application managed by the CLR  If you are writing an application in Visual C    NET you can produce managed code if you like  but it s optional   Unmanaged Code  Unmanaged code compiles straight to machine code  So  by that definition all code compiled by traditional C C   compilers is  unmanaged code   Also  since it compiles to machine code and not an intermediate language it is non-portable   No free memory management or anything else the CLR provides   Since you cannot create unmanaged code with Visual Basic or C   in Visual Studio all unmanaged code is written in C C     Mixing the two  Since Visual C   can be compiled to either managed or unmanaged code it is possible to mix the two in the same application  This blurs the line between the two and complicates the definition  but it s worth mentioning just so you know that you can still have memory leaks if  for example  you re using a third party library with some badly written unmanaged code   Here s an example I found by googling    using  lt mscorlib dll gt  using namespace System    include  stdio h   void ManagedFunction         printf  Hello  I m managed in this section n        pragma unmanaged UnmanagedFunction         printf  Hello  I am unmanaged through the wonder of IJW  n        ManagedFunction        pragma managed int main         UnmanagedFunction        return 0

User · Answer

Managed code is a differentiation coined by Microsoft to identify computer program code that requires and will only execute under the  management  of a Common Language Runtime virtual machine  resulting in Bytecode    http   en wikipedia org wiki Managed code  http   www developer com net cplus article php 2197621 Managed-Unmanaged-Native-What-Kind-of-Code-Is-This htm

[.net] Difference between "managed" and "unmanaged"

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