? Windows 窗體 ComboBox 控件用于在下拉組合框中顯示數據。默認情況下， ComboBox 控件分兩個部分顯示：頂部是一個允許用戶鍵入列表項的文本框。第二個部分是列表框.
?我們就是根據它有兩部分組成,來實現對現有的COMBOBOX的擴展..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 ();
??}

?}
}

讓后我們可以通過繼承該COMBOBOX來實現COMBOBOX下拉內容的自定義..
?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


??

自定義COMBOBOX控件