//定义字典Dictionary<string, string> Address = new Dictionary<string, string>();        void loadData()        {           //这是你要添加的数据          //也可以选择动态添加但是考虑到数据不多不影响性能就这么做了            Address.Add("绵阳", "四川");            Address.Add("成都", "四川");            Address.Add("广汉", "四川");            Address.Add("南京", "江苏");            Address.Add("扬州", "江苏");            Address.Add("无锡", "江苏");            Address.Add("珠海", "广州");            Address.Add("东莞", "广州");            Address.Add("深圳", "广州");            Address.Add("上海", "直辖市");            //通过循环值添加进省会下拉框            foreach (string province in Address.Values)            {                  //判断下 避免重复添加省会名                if (!comboBoxEdit1.Properties.Items.Contains(province))                    comboBoxEdit1.Properties.Items.Add(province);            }//省会下拉框选择索引方法private void comboBoxEdit1_SelectedIndexChanged(object sender, EventArgs e)        {            //添加之前先把市级下拉框清空 避免追加数据             //你也可以选择动态添加            comboBoxEdit2.Properties.Items.Clear();           //通过值查找键值            foreach (KeyValuePair<string, string> kvp in Address)            {                if (kvp.Value.Equals(comboBoxEdit1.SelectedItem.ToString()))                {                    comboBoxEdit2.Properties.Items.Add(kvp.Key);                }            }                }