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

Short answer is no you can't.

Longer answer is that is because foreach is syntactic sugar - it gets an iterator from the collection and calls Next on it. This is not possible with two collections at the same time.

If you just want to have a single loop, you can use a for loop and use the same index value for both collections.

for(int i = 0; i < collectionsLength; i++)
{
   list1[i];
   list2[i];
}

An alternative is to merge both collections into one using the LINQ Zip operator (new to .NET 4.0) and iterate over the result.