asp.net列表框中的事件 [英] Event in asp.net list box

问题描述

我如何在列表框事件处理程序中编写代码，我正在尝试valuechanged 和indexchanged 事件，但无法获取该事件.


请帮助我...

解决方案

很可能您没有设置AutoPostBack [ MSDN:ListControl.SelectedIndexChanged事件 [ ^ ]

样本:

 <  表格    id   ="     runat   ="  <   asp:ListBox     id   ="  
                   span>          ="   ListBox1_SelectedIndexChanged" 
                        ="   true" 
                        ="  服务器" <   asp:ListItem  >  Item 1 <  /asp:ListItem  > 
         <   asp:ListItem  >  Item 2 <  /asp:ListItem  > 
         <   asp:ListItem  >  Item 3 <  /asp:ListItem  > 
         <   asp:ListItem  >  Item 4 <  /asp:ListItem  > 
         <   asp:ListItem  >  Item 5 <  /asp:ListItem  > 
         <   asp:ListItem  >  Item 6 <  /asp:ListItem  > 
       <  /asp:ListBox  > 

       <   asp:Label     id   ="   runat   服务器" > 
    <  /form  >  

 受保护的 无效 ListBox1_SelectedIndexChanged(对象发​​件人，EventArgs e)
{
    Label1.Text = "  + ListBox1.SelectedItem.Text +
                     "  + ListBox1.SelectedItem.价值+
                     " ;
   // 选择Item4会得出:您选择的Item 4的值为

How can i write the code in list box event handler, i am trying valuechanged and indexchanged event but i can not get the event.


please help me...

解决方案

Most likely you haven''t set the AutoPostBack[^] to true

Here, have a look at how it can be done:
MSDN: ListControl.SelectedIndexChanged Event[^]

Sample:

<form id="form1" runat="server">
       <asp:ListBox id="ListBox1"

            OnSelectedIndexChanged="ListBox1_SelectedIndexChanged"

            AutoPostBack="true"

            runat="server">
         <asp:ListItem>Item 1</asp:ListItem>
         <asp:ListItem>Item 2</asp:ListItem>
         <asp:ListItem>Item 3</asp:ListItem>
         <asp:ListItem>Item 4</asp:ListItem>
         <asp:ListItem>Item 5</asp:ListItem>
         <asp:ListItem>Item 6</asp:ListItem>
       </asp:ListBox>

       <asp:Label id="Label1" runat="server"/>
    </form>

protected void  ListBox1_SelectedIndexChanged(object sender, EventArgs e) 
{
    Label1.Text = "You selected " + ListBox1.SelectedItem.Text +
                     " with a value of

" + ListBox1.SelectedItem.Value + "."; // Selection of Item4 gives: "You selected Item 4 with a value of

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