是否可以使用 c# 代码将 object 引用重新解释为本机 int ？

Question

Disclaimer: I understand this is an unsafe operation and bad practice, I merely want to know if it's possible.

Basically, I'm trying to convert an object reference to a nint ( IntPtr ). They take up the same size in memory, so it should be possible in theory. I've gotten it to work using a DynamicMethod:

DynamicMethod dyn = new DynamicMethod("", typeof(nint), new[] { typeof(object) });
ILGenerator il = dyn.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ret);
Func<object, nint> objectToIntFunction = (Func<object, nint>)dyn.CreateDelegate(typeof(Func<object, nint>));
object obj = new object();
nint asNativeInt = objectToIntFunction(obj);

Is this possible using only C# code? I haven't found anything suitable in System.Runtime.CompilerServices.Unsafe .

I've also tried this:

[StructLayout(LayoutKind.Explicit)]
struct Cast
{
    [FieldOffset(0)]
    public nint Number;
    [FieldOffset(0)]
    public object Object;
};

Cast cast = new Cast
{
    Object = obj
};
nint number = cast.Number;

But I get the following error:

System.TypeLoadException: 'Could not load type 'Cast' from assembly because it contains an object field at offset 0 that is incorrectly aligned or overlapped by a non-object field.'

Answer 1

I haven't found anything suitable in System.Runtime.CompilerServices.Unsafe

object obj = new object();
nint asNativeInt = Unsafe.As<object, nint>(ref obj);

There you have it.