fluent interface implementation example

FluentInterface.cs

public class WeightedModel {

        private WeightedModel() {
            _set = new WeightedModelFluentInterface(this);
        }

        public static WeightedModelFluentInterface Create() {
            return new WeightedModel().Set;
        }

        private WeightedModelFluentInterface Set
        {
            get { return _set; }
        }

        private readonly WeightedModelFluentInterface _set;
        private Dictionary<string, Tuple<int, int>> _modelWithWeight = new Dictionary<string, Tuple<int, int>>();

        public class WeightedModelFluentInterface {
            private readonly WeightedModel _weightedModel;

            public WeightedModelFluentInterface(WeightedModel weightedModel) {
                _weightedModel = weightedModel;
            }

            public WeightedModelFluentInterface SetaaaModel(int posWeight, int negWeight) {
                _weightedModel.ModelWithWeight["aaa"] = Tuple.Create(posWeight, negWeight);
                return this;
            }
            public WeightedModelFluentInterface SetbbbModel(int posWeight, int negWeight)
            {
                _weightedModel.ModelWithWeight["bbb"] = Tuple.Create(posWeight, negWeight);
                return this;
            }
            public WeightedModelFluentInterface SetcccModel(int posWeight, int negWeight)
            {
                _weightedModel.ModelWithWeight["ccc"] = Tuple.Create(posWeight, negWeight);
                return this;
            }
            public WeightedModelFluentInterface SetdddModel(int posWeight, int negWeight)
            {
                _weightedModel.ModelWithWeight["ddd"] = Tuple.Create(posWeight, negWeight);
                return this;
            }

            public WeightedModel Complete() {
                return _weightedModel;
            }
        }

        public Dictionary<string, Tuple<int, int>> ModelWithWeight {
            get { return _modelWithWeight; }
            set { _modelWithWeight = value; }
        }
    }