How is unmanaged code run in .NET?

Question

How does unmanaged code run in .net?

Answer 1

Most commonly, using P/Invoke, COM, or C++/CLI.

Answer 2

If you want a good overview of how .Net interoperates with unmanaged code, you could start with An Overview of Managed/Unmanaged Code Interoperability on MSDN.

It discusses security, performance, and what exactly happens at the interop boundary.

There are links for further reading at the bottom.