ComboBox添加Item

自定义一个ListItem类

public class ListItem
    {
        private string _key;

        public string Key
        {
            get { return _key; }
            set { _key = value; }
        }

        private string _value;

        public string Value
        {
            get { return this._value; }
            set { this._value = value; }
        }

        public ListItem(string key, string value)
        {
            _key = key;
            _value = value;
        }

        public override string ToString()
        {
            return this._value;
        }
    }

取值

string key = ((ListItem)comboBox1.SelectedItem).Key;
string value = ((ListItem)comboBox1.SelectedItem).Value;
string value = ((ListItem)comboBox1.SelectedItem).ToString();