Question

I’ve two arrays like

string[] a = { "a", "b", "c" };
string[] b = { "a", "b", "c" };

I need to compare the two arrays using LINQ.

The comparison should take place only if both arrays have same size. The data can be in any order and still return true if all values of a[] and all values of b[] are the same.

Answer 1

string[] a = { "a", "b" };
string[] b = { "a", "b" };

return (a.Length == b.Length && a.Intersect(b).Count() == a.Length);

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After some performance testing:

• Over 10,000 small strings – 5ms
• Over 100,000 small strings – 99ms
• Over 1,000,000 small strings – Avg. 601ms
• Over 100,000 ~500 character strings – 190ms