Create a StringDictionary Class

I want to be able to create a class type with a StringDictionary as one of the members.

        public class Filter
        {
            public string type = "criterion_filter";
            public NameValueCollection patterns;

            public AdultFilter(string Type, NameValueCollection Patterns)
            {
                this.type = Type;
                NameValueCollection patterns = new NameValueCollection();
                patterns.Add(Patterns);
            }
        }

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Where I can add multiple patterns into the class, which eventually I'll convert into a JSON object that looks like:

“patterns” : {
     “sex” : [ “s”, “e” ],
      “nin” : [“a”],
      “shoes” : [“f”],
      “run” : [“e”]
}

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using the NewtonSoft.Json library...