P / Invoke with SafeHandle作为参考参数

Question

我在一个非托管的Dll中有一个函数，它需要一个像Handle那样的指针：

extern "C" __declspec(dllexport) BOOL __stdcall MySetEvent(HANDLE* handle, 
int size)
{
    if (!handle) return FALSE;
    assert(sizeof(*handle) == size);
    printf("MySetEvent(%p, %d)\n", *handle, size);
    return SetEvent(*handle);
}

如何在不使用DangerousGetHandle的情况下从C＃调用此方法？

[DllImport("UnmanagedDll", SetLastError = true)]
static extern int MySetEvent(ref IntPtr handle, int size);


AutoResetEvent ev = new AutoResetEvent(false);
var handle = ev.SafeWaitHandle.DangerousGetHandle();
MySetEvent(ref handle, Marshal.SizeOf(handle));

这不起作用（抛出.ctor的MissingMethodException）：

[DllImport("UnmanagedDll", SetLastError = true)]
static extern int MySetEvent([In] ref SafeHandle handle, int size);


SafeHandle handle = ev.SafeWaitHandle;
MySetEvent(ref handle,  Marshal.SizeOf(IntPtr.Zero));