Filtern mit dem Blacklist - Whitelist Verfahren

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using System.Collections.Generic;

namespace Filter
{
    internal class BlackWhite<T>
    {
        private Dictionary<T, bool> black = new Dictionary<T, bool>();
        private Dictionary<T, bool> white = new Dictionary<T, bool>();

        public BlackWhite(IList<T> black, IList<T> white)
        {
            foreach (T t in black) {
               this.black [t] = true;
            }
            foreach (T t in white) {
               this.white [t] = true;
            }
        }

        public List<T> GetGoodList(IList<T> inputList)
        {
            List<T> goodList = new List<T>();

            foreach (T t in inputList)
            {
                if (white.ContainsKey(t) || !black.ContainsKey(t)) {
                    goodList.Add(t);
                }
            }
            return goodList;
        }
    }
}