17.2. Marshaling Common Types

The CLR marshaler is a .NET facility that knows about the core types used by COM and the Windows API, and provides default translations to CLR types for you. The bool type, for instance, can be translated into a two-byte Windows BOOL type or a four-byte Boolean type. Using the MarshalAs attribute, you can override a default translation:

using System.Runtime.InteropServices;
static extern int Foo([MarshalAs(UnmanagedType.LPStr)]
                      string s);