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| ＜% @ Page Language = "C#" %＞ ＜html ＞ ＜head ＞ ＜script runat = "server" ＞ protected void Button_Click ( object sender , EventArgs e ) { //按钮"增加条目"事件处理程序 if ( sender == Add ) { if ( txtItem.Text != "" ) { lstItem . Items . Add ( new ListItem ( txtItem . Text ) ) ; } } //按钮"删除"事件处理程序 if ( sender == Del ) { if ( lstItem . SelectedIndex ＞ -1 ) { lstItem . Items . Remove ( lstItem . SelectedItem ) ; } } //按钮"向上移位"和"向下移位"事件处理程序 if ( ( sender == Up && lstItem . SelectedIndex ＞ 0 ) || ( sender == Down && lstItem . SelectedIndex ＜ lstItem . Items . Count - 1 ) ) { int offset ; if ( sender == Up ) { offset = -1 ; } else { offset = 1 ; } ListItem lstTemp = new ListItem ( lstItem . SelectedItem . Text , lstItem . SelectedItem . Value ) ; lstItem . Items [ lstItem.SelectedIndex ] .Text = lstItem . Items [ lstItem . SelectedIndex + offset ] . Text ; lstItem . Items [ lstItem . SelectedIndex ] . Value = lstItem . Items [ lstItem . SelectedIndex + offset ] . Value ; lstItem . Items [ lstItem . SelectedIndex + offset ] . Text = lstTemp . Text ; lstItem . Items [ lstItem . SelectedIndex + offset ] . Value = lstTemp . Value ; lstItem . SelectedIndex = lstItem . SelectedIndex + offset ; } //按钮"至首条"事件处理程序 if ( sender == First ) { if ( lstItem . Items . Count ＞ 0 ) { lstItem . SelectedIndex = 0 ; } } //按钮"至尾条"事件处理程序 if ( sender == Last ) { if ( lstItem . Items . Count ＞ 0 ) { lstItem . SelectedIndex = lstItem . Items . Count - 1 ; } } //按钮"上一条"事件处理程序 if ( sender == Prev ) { if ( lstItem . SelectedIndex ＞ 0 ) { lstItem . SelectedIndex = lstItem . SelectedIndex - 1 ; } } //按钮"下一条"事件处理程序 if ( sender == Next ) { if ( lstItem . SelectedIndex ＜ lstItem . Items . Count - 1 ) { lstItem . SelectedIndex = lstItem . SelectedIndex + 1 ; } } } ＜/script ＞ ＜/head ＞ ＜body ＞ ＜form runat = "server" ＞ ＜table ＞ ＜tr ＞ ＜td Colspan = 2 ＞ ＜h1 ＞ ＜font color = "red" ＞ WinForm组件ListBox演示程序 ＜/font ＞ ＜/h1 ＞ ＜/td＞ ＜/tr ＞ ＜tr ＞ ＜td ＞ 请输入要增加的条目名称:＜/td ＞ ＜td ＞ ＜asp:TextBox id = "txtItem" TextMode = "SingleLine" runat = "server"/＞ ＜asp:Button id = Add Text = "增加条目" runat = "server" onclick = "Button_Click"/＞ ＜/td ＞ ＜/tr ＞ ＜tr ＞ ＜td ＞ListBox: ＜br ＞ ＜asp:ListBox id = "lstItem" Width = 200 Height = 250 runat = "server" ＞ ＜asp:ListItem ＞ 第一个条目 ＜/asp:ListItem ＞ ＜/asp:ListBox ＞ ＜/td ＞ ＜td ＞ ＜asp:Button id = "Del" Text = "删除" runat = "server" onclick = "Button_Click" /＞ ＜asp:Button id = "Up" Text = "向上移位" runat = "server" onclick = "Button_Click" /＞ ＜asp:Button id = "Down" Text = "向下移位" runat = "server" onclick = "Button_Click" /＞ ＜asp:Button id = "First" Text = "至首条" runat = "server" onclick = "Button_Click" /＞ ＜asp:Button id="Prev" Text = "上一条" runat = "server" onclick = "Button_Click" /＞ ＜asp:Button id = "Next" Text = "下一条" runat = "server" onclick = "Button_Click" /＞ ＜asp:Button id = "Last" Text = "至尾条" runat = "server" onclick = "Button_Click" /＞ ＜/td ＞ ＜/tr ＞ ＜/table ＞ ＜/form ＞ ＜body ＞ ＜/html ＞ |
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