C中的结构修改会影响非托管内存吗?

我相信会发生的是: 当从我的非托管DLL中获取一个结构时,这与调用获取一个IntPtr,然后使用它和Marshal类将结构复制到托管内存中是一样的(在托管内存中对结构所做的更改不会冒泡)。

下面是我的代码:

[DllImport("mydll.dll", BestFitMapping=false, CharSet=CharSet.Ansi)]
private static extern int GetStruct(ref MyStruct s);

[StructLayout(LayoutKind.Sequential, Pack=0)]
struct MyStruct
{
     public int    Field1;
     public IntPtr Field2;
}

public void DoSomething()
{
      MyStruct s = new MyStruct();
      GetStruct(ref s);

      s.Field1 = 100; //does unmanaged memory now have 100 in Field1 as well?
      s.Field2 = IntPtr.Zero; //does unmanaged memory now have a NULL pointer in field Field2 as well?
}