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

1.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;

}

}

}

2.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);

3.取值

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

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

4.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