c#(winform)中自定义ListItem类方便ComboBox添加Item项
一，定义ListItem类

 public class ListItem    {        private string _key = string.Empty;        private string _value = string.Empty;        public ListItem(string pKey, string pValue)        {            _key = pKey;            _value = pValue;        }        public override string ToString()        {            return this._value;        }        public string Key        {            get            {                return this._key;            }            set            {                this._key = value;            }        }        public string Value        {            get            {                return this._value;            }            set            {                this._value = value;            }        }    }

二，使用

ListItem listItem1 = new ListItem("1","中国");ListItem listItem2 = new ListItem("1","美国");ListItem listItem3 = new ListItem("1","英国");comboBox1.Items.Add(listItem1);comboBox1.Items.Add(listItem2);comboBox1.Items.Add(listItem3);

三，取值

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

四、默认选中项
comboBox1.SelectedIndex = 0;//设置第一项为默认选择项
comboBox1.SelectedItem = listItem1//设置指定的项为默认选择项