WinForm中的ListBox组件编程

ChinaItLab

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2006-7-24

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四．本文中源程序代码(listbox.aspx)和执行的界面：

下图是执行了下列源程序代码(listbox.aspx)后，生成的界面：

listbox.aspx源程序代码，具体如下：

＜% @ 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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