Is there a constraint, interface or class that envelops IEnumerable or array?

Question

I'd like to take the following if possible and combine them:

public static T[] ForEach<T>(this T[] TArray, Action<T> doWhat)
 {
  foreach (var item in TArray)
  {
   doWhat(item);
  }
  return TArray;
 }

The above handles array, below handles lists

 public static IEnumerable<T> ForEach<T>(this IEnumerable<T> TList, Action<T> action)
 {
  foreach (var item in TList)
   action(item);
  return TList;
 }

Is there something in common that both inherit from or implement as an interface?

Answer 1

Array inherits from IEnumerable.