System.Runtime.InteropServices (mscorlib.dll)struct

When you pass a managed object into unmanaged code using PInvoke, there is a chance that the garbage collector will finalize the object before the unmanaged code is finished with it. This can only happen when your managed code does not reference the object after the PInvoke call. Because the garbage collector's reach does not extend into unmanaged code, this fools the garbage collector into thinking that you are finished with it.

This class is used to wrap your managed object before passing it into unmanaged code, and you are guaranteed that the garbage collector will not touch it until the PInvoke call returns.

public struct HandleRef {
// Public Constructors
   public HandleRef(object wrapper, IntPtr handle);
// Public Instance Properties
   public IntPtr Handle{get; }
   public object Wrapper{get; }
// Public Static Methods
   public static explicit operator IntPtr(HandleRef value);


System.Object System.ValueType HandleRef

    Part II: Programming with the .NET Framework
    Part IV: API Quick Reference
    Chapter 26. System