Question

I have two List’s which I want to check for corresponding numbers.

for example

List<int> a = new List<int>(){1, 2, 3, 4, 5}; List<int> b = new List<int>() {0, 4, 8, 12}; 

Should give the result 4. Is there an easy way to do this without too much looping through the lists?

I’m on 3.0 for the project where I need this so no Linq.

Answer 1

You can use the .net 3.5 .Intersect() extension method:-

List<int> a = new List<int>() { 1, 2, 3, 4, 5 }; List<int> b = new List<int>() { 0, 4, 8, 12 };  List<int> common = a.Intersect(b).ToList();