c# modifying structs in a List

Question

Short question: How can I modify individual items in a List? (or more precisely, members of a struct stored in a List?)

Full e

Answer 1

The two errors you specified have to do with the fact that you are using structs, which in C# are value types, not reference types.

You absolutely can use reference types in foreach loops. If you change your structs to classes, you can simply do this:

    foreach(var item in gAllCats[c].items)
    {
        item.subItems = item.subItems.OrderBy(x => x.subNum).ToList();
    }

With structs this would need to change to:

    for(int i=0; i< gAllCats[c].items.Count; i++)
    {
        var newitem = gAllCats[c].items[i];
        newitem.subItems = newitem.subItems.OrderBy(x => x.subNum).ToList();
        gAllCats[c].items[i] = newitem;
    }

The other answers have better information on why structs work different than classes, but I thought I could help with the sorting part.