How do I remove duplicates from a C# array?

You could possibly use a LINQ query to do this:

int[] s = { 1, 2, 3, 3, 4};
int[] q = s.Distinct().ToArray();

Here is the HashSet<string> approach:

public static string[] RemoveDuplicates(string[] s)
{
    HashSet<string> set = new HashSet<string>(s);
    string[] result = new string[set.Count];
    set.CopyTo(result);
    return result;
}

Unfortunately this solution also requires .NET framework 3.5 or later as HashSet was not added until that version. You could also use array.Distinct(), which is a feature of LINQ.

How do I remove duplicates from a C# array?

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