C#键值对容器的介绍

Dictionary dic = new Dictionary ();
dic.Add( "1 ", "Jerry ");
dic.Add( "2 ", "Kimmy ");
dic.Add( "3 ", "Tommy ");

public class KeyValueItem
    {
        private int _Value;
        public int Value
        {
            get
            {
                return _Value;
            }
        }
        private string _Name;
        public string Name
        {
            get
            {
                return _Name;
            }
        }
        //
        public KeyValueItem(string name, int value)
        {
            _Name = name;
            _Value = https://www.jb51.net/dgjack/archive/2012/03/03/value;
        }
        public override string ToString()
        {
            return _Name;
        }
    }

KeyValueItem it = new KeyValueItem("客户1", 1);
            comboBox1.Items.Add(it);
            it = new KeyValueItem("客户2", 2);
            comboBox1.Items.Add(it);
            it = new KeyValueItem("客户3", 3);
            comboBox1.Items.Add(it);

int relatiOntype= ((KeyValueItem)comboBox1.SelectedItem).Value;