Question

How can i effectively remove duplicates from two string arrays? I want to remove all the duplicates from a string[] a that are in a separate string[] b

for example

a = { "1", "2", "3", "4"};
b = { "3", "4", "5", "6"};

the result i am looking for would just be

c = { "5", "6"};

Answer 1

Enumerable.Except produces set difference of two sequences

var c = b.Except(a).ToArray(); // gives you { "5", "6" }