How should I use properties when dealing with read-only List members

Question

When I want to make a value type read-only outside of my class I do this:

public class myClassInt
{
    private int m_i;
    public int i {
        get { ret         


        

Answer 1

public static IEnumerable AsReallyReadOnly(this IEnumerable source)
{
    foreach (T t in source) yield return t;
}

if I add to Earwicker's example

...
IEnumerable f = a.AsReallyReadOnly();
IList g = f.AsWritable(); // finally can't get around it

g.Add(8);
Debug.Assert(a.Count == 78);

I get InvalidOperationException: Sequence contains no matching element.