permutation of array items

Question

How do I go about getting a combination of an array of strings of count 2? Ie.

List myString = {\"a\", \"b\", \"c\", \"d\", \"f\"};
         


        

Answer 1

Without LINQ, you can use a nested loop:

var permutations = new List();
for(int i = 0; i < myString.Count; i++) 
{
    for(int j = 0; j < myString.Count; j++)
    {
        if(i == j)
            continue;

        var permutation = string.Format("{0}{1}", myString[i], myString[j]);
        permutations.Add(permutation);
    }
}