© { JSL }
42
·unboxing
copies the boxed value back again
wthis
requires an explicit cast to exact type
wif the
target type is wrong - InvalidCastException
struct Pair
{
public int X, Y;
...
}
static void Function()
{
Pair p = new Pair(1,2);
object o = p;
p.X = p.Y = 0;
Pair q = (Pair)o;
}
p.X
stack
heap
0
0
p.Y
.X
1
2
.Y
@
o
cast
q.X
1
2
q.Y
box
unbox