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

Use the good old goto:

restart:
foreach(Constrain c in Constrains)
{
   if(!c.Allows(a))
   {
      a.Change();
      goto restart;
   }
}

If you're diagnosed with gotophobia 100% of the time for some reason (which is not a good thing without a reason), you can try using a flag instead:

bool restart;
do {
   restart = false;
   foreach(Constrain c in Constrains)
   {
      if(!c.Allows(a))
      {
         a.Change();
         restart = true;
         break;
      }
   }
} while (restart);