Windows 窗体 ComboBox 控件用于在下拉组合框中显示数据。默认情况下，ComboBox 控件分两个部分显示：顶部是一个允许用户键入列表项的文本框。第二个部分是列表框.
我们就是根据它有两部分组成,来实现对现有的COMBOBOX的扩展..CODING AS FOLLOWWING:
public class ComboBase : System.Windows.Forms.ComboBox
{
System.Data.DataTable oTable = null;
System.Data.DataView oDv = null;
public ComboBase()
{
SetIniDrop("disPlay","valPlay");
}
private void SetIniDrop(string DisPlay,string ValPlay)
{
oTable = new System.Data.DataTable("combo");
oTable.Columns.Add(DisPlay,typeof(string));
oTable.Columns.Add(ValPlay,typeof(string));
oTable.Rows.Add(new object[]{"",""});
oDv = new System.Data.DataView(oTable,"","",System.Data.DataViewRowState.CurrentRows);
this.DataSource = oDv;
this.DisplayMember = DisPlay;
this.ValueMember = ValPlay;
}
public void Add(string[] sender)
{
oTable.Rows.Add(sender);
}
protected override void OnCreateControl()
{
base.OnCreateControl ();
}
}
}
让后我们可以通过继承该COMBOBOX来实现COMBOBOX下拉内容的自定义..
public class MyComBase : ClassLibrary2.ComboBase
{
/// <summary>
public MyComBase()
{
}
protected override void OnCreateControl()
{
base.Add(new string[]{"1","ENGLISH"});
base.Add(new string[]{"2","CHINA"});
base.OnCreateControl ();
}
}
THAT'S ALL