The most reliable way to clear the <T> list depending on the Predicate <T>

Question

I have List<T> dataandPredicate<T> condition.

How should I use for cleaning datadepending on the result condition?

• Option 1:

  var del = data.Where(i => condition);
  data.RemoveAll(i => del.Contains(i));
  

• Option 2:

  var del = data.Where(i => condition);
  for (int i = 0; i < del.Count; i++)
      data.Remove(del[i]);
  

• Option 3:

  var del = data.Where(i => condition);
  foreach (var i in del)
     data.Remove(i);
  

• Option 4:

  data = data.Where(i => !condition);
  

• Any others?

Answer 1

What about:

data.RemoveAll(condition);

Please note that your fourth option will not work without a call ToList().