How to compare two lists?

Question

How to compare two lists?

There are two lists

var lst1 = new List<string>(){"1","2","3"};
var lst2 = new List<string>(){"4","2","3"};</string></string>

Using Intersect I bring those elements that are repeated but I would like to know how many times each element is repeated.

var rez = lst1.Intersect(lst2); // here the result is 2 and 3

And I would like so
var rez = lst1.Method(lst2)
2 found 2 times
3 occurs 2 times.

C#

Elliot_Leffl asked July 9th 19 at 13:56

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2 answers

caesar answered on · Answer 1 · 2019-07-09T13:58:18.115Z

caesar answered on July 9th 19 at 13:58

First, determine which elements coincide in a separate list (using Intersect). And then in the loop check whether each element required of the list this checklist (using Contains).

Sister.OConner74 answered on · Answer 2 · 2019-07-09T14:00:18.115Z

You can record the result Interselect in the dictionary element is the number of occurrences, then run in a loop through the worksheets, counting a specific number. Something like

var lst1 = new List<string>(){"1", "2", "3"};
 var lst2 = new List<string>(){"4", "2", "3"};

 var intersect = new List<string>(lst1.Intersect(lst2));
 var res = new Dictionary<string, int32>();
 intersect.ForEach(el => res.Add(el,0));

 foreach (var el in lst1)
 if (res.ContainsKey(el))
res[el]++;
 foreach (var el in lst2)
 if (res.ContainsKey(el))
res[el]++;


 foreach (var el in res)
 Console.WriteLine("{0}: {1} time(s)", el.Key, el.Value);</string></string></string></string>