Indicates that any copying of values of this type must use the copy constructor provided by the type. This class cannot be inherited.
Assembly: mscorlib (in mscorlib.dll)
Any type modified by the class must implement a method named MarshalCopy that calls the native copy constructor.
Any native C++ type that is emitted into metadata with copy constructors needs to have those methods called by the marshaler when copying values across the marshaling boundary. The Microsoft C++ compiler modifies all native C++ types in method parameters and return types that have this modifier to trigger this behavior in the marshaling code.
Compilers emit custom modifiers within metadata to change the way that the just-in-time (JIT) compiler handles values when the default behavior is not appropriate. When the JIT compiler encounters a custom modifier, it handles the value in the way that the modifier specifies. Compilers can apply custom modifiers to methods, parameters, and return values. The JIT compiler must respond to required modifiers but can ignore optional modifiers.
You can emit custom modifiers into metadata using one of the following techniques:
Generating a Microsoft intermediate language (MSIL) instruction file that contains calls to modopt and modreq, and assembling the file with the Ilasm.exe (MSIL Assembler).
Using the unmanaged reflection API.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.