How to iterate through two collections of the same length using a single foreach

Question

I know this question has been asked many times before but I tried out the answers and they don\'t seem to work.

I have two lists of the same length but not the same

Answer 1

foreach(var tup in list1.Zip(list2, (i1, i2) => Tuple.Create(i1, i2)))
{
  var listItem1 = tup.Item1;
  var listItem2 = tup.Item2;
  /* The "do stuff" from your question goes here */
}

It can though be such that much of your "do stuff" can go in the lambda that here creates a tuple, which would be even better.

If the collections are such that they can be iterated, then a for() loop is probably simpler still though.

Update: Now with the built-in support for ValueTuple in C#7.0 we can use:

foreach ((var listitem1, var listitem2) in list1.Zip(list2, (i1, i2) => (i1, i2)))
{
    /* The "do stuff" from your question goes here */
}