Konami Code in C#

Question

I am looking to have a C# application implement the Konami Code to display an Easter Egg. http://en.wikipedia.org/wiki/Konami_Code

What is the best way to do this?<

Answer 1

I've read all the answers, and found that repeated input of the initial of the sequence was a common problem of implementations. The following is a simple implementation without encountering the repeat of initial problem. No special cases, nothing is really hard-coded, the integers specified in the class is only for a default value.

public partial class KonamiCode {
    public bool IsCompletedBy(int keyValue) {
        for(var i=sequence.Count; i-->0; ) {
            if(sequence[i]!=keyValue) {
                if(0==i)
                    count=0;

                continue;
            }

            if(count!=i)
                continue;

            ++count;
            break;
        }

        var isCompleted=sequence.Count==count;
        count=isCompleted?0:count;
        return isCompleted;
    }

    public KonamiCode(int[] sequence=default(int[])) {
        this.sequence=
            sequence??new[] { 38, 38, 40, 40, 37, 39, 37, 39, 66, 65 };
    }

    int count;
    IList sequence;
    public static readonly KonamiCode Default=new KonamiCode();
}