Question

I have string array say string str[] = {"a", "b"}

and List<string> lst = new List<string> {"a", "b"}

How can I make sure that both string array and list contains the same values. Note: The values can be in any order but must have the same frequency.

Can anyone tell me how to do it in LINQ?

Thanks.

Answer 1

Okay, since order does not matter but frequncies do, you need to count each key, and then check that the resulting pairs of keys/counts are equal:

var first = str.GroupBy(s => s)
               .ToDictionary(g => g.Key, g => g.Count());

var second = lst.GroupBy(s => s)
                .ToDictionary(g => g.Key, g => g.Count());

bool equals = first.OrderBy(kvp => kvp.Key)
                   .SequenceEquals(second.OrderBy(kvp => kvp.Key));