Restart a foreach loop in C#?

Question

How can I restart a foreach loop in C#??

For example:

Action a;
foreach(Constrain c in Constrains)
{
   if(!c.Allows(a))
   {
      a.Change         


        

Answer 1

void Main()
{
    IEnumerable cons;
    SomeObject a;

    while(!TryChangeList(cons, a)) { }
}

// the name tryChangeList reveals the intent that the list will be changed
private bool TryChangeList(IEnumerable constrains, SomeObject a)
{
    foreach(var con in constrains)
    {
        if(!c.Allows(a))
        {
            a.Change();
            return false;
        }
    }
    return true;
}