Compare Values of 2 Lists C#

Question

I want to compare the values of two lists for a program I'm making. I want it to compare the 1st value of List 1 to the first value of List 2, and then the second value of List 1 to the second value of List 2, and so on.

How would I go about doing this in C#?

We can't help you if you can't show us what you've tried and that you at least researched for some time. — Ricardo Souza, Jun 15 '13 at 02:27

score 12 · Accepted Answer · edited Jun 15 '13 at 03:02

12

There is a special method for this, called SequenceEqual:

IList<int> myList1 = new List<int>(...);
IList<int> myList2 = new List<int>(...);
if (myList1.SequenceEqual(list2)) {
    ...
}

You can do custom comparison of sequences using the Zip method. For example, to see if any pair is not within the difference of three, you can do this:

IList<int> myList1 = new List<int>(...);
IList<int> myList2 = new List<int>(...);
if (myList1.Zip(list2, (a, b) => Math.Abs(a - b)).Any(diff => diff > 3)) {
    ...
}

edited Jun 15 '13 at 03:02

p.s.w.g

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answered Jun 15 '13 at 02:27

Sergey Kalinichenko

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2

We can't educate the children if you give'em candies before dinner. ;) – Ricardo Souza Jun 15 '13 at 02:32
Is it possible for me to just get the variable? Because I'm not just wanting to check if it's equal, but I want to see if it's between the range of -3 and +3 (which I know how to do). – ShaunRussell Jun 15 '13 at 02:33
@rcdmk This one is not exactly named for easy searching on, say, google. You need to know where to search to find it. – Sergey Kalinichenko Jun 15 '13 at 02:34
@Spl33nMaster You need a different method then - take a look at the update. – Sergey Kalinichenko Jun 15 '13 at 02:38
OK, OK... +1 for the `Zip` solution. – Ricardo Souza Jun 15 '13 at 18:47

Compare Values of 2 Lists C#

1 Answers1