C#-Specific Metadata Directives

I try to use BinaryFormatter() or Marshal.StructureToPtr() method to convert an class object or a data structure object into byte array.
Both got errors:
(1) it is not marked as serializable
(2) it cannot be marshaled as an unmanaged structure; no meaningful size or offset can be computed

So I added a cs Metadata Directives to the class or struct, but it got errors as well. For example the following is in Ice Document but when I add it to my ice file, does not pass Slice2cs.

["cs:attribute:System.Serializable"]
struct Point {
double x;
double y;
};

Thanks

chang wrote: »

["cs:attribute:System.Serializable"]
struct Point {
double x;
double y;
};

That should work, what is the error reported by slice2cs?

ignor my post

Sorry
The MSVS IDE red colored this line in ice file and make me thinking that Slice2cs produced error.
It does not. After I deleted old cs file and let Slice2cs regenerate the cs file, it works now.
It is a false error message.