asp.net 两个listbox交互

两个ListBox的互动方法

效果:



ASPX页面:      
 <table>
   
<tbody>
      
<tr>
         
<td>
            
<asp:ListBox ID="lbLeft" runat="server" SelectionMode="Multiple">
               
<asp:ListItem>添加名字</asp:ListItem>
               
<asp:ListItem>出生年月</asp:ListItem>
            
</asp:ListBox>
         
</td>
         
<td style="width: 27px">
            
<asp:Button ID="btnToRight" runat="server" Text=">>"
                    OnClick
="btnToRight_Click" />
            
<br />
            
<asp:Button ID="btnToLeft" runat="server" Text="<<"
                        OnClick
="btnToLeft_Click" />
            
</td>
         
<td style="width: 3px">
            
<asp:ListBox ID="lbRight" runat="server"
                    SelectionMode
="Multiple"></asp:ListBox></td>
      
</tr>
   
</tbody>
</table>
<asp:Label ID="lblMsg" runat="server"></asp:Label>

CS Code :
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;


   
public partial class Test1 : System.Web.UI.Page
   
{
      
protected void Page_Load ( object sender , EventArgs e )
      
{

      }

      
protected void btnToRight_Click(object sender, EventArgs e)
      
{
         
if(lbLeft.SelectedItem != null)
         
{
            AddItemFromSourceListBox(lbLeft, lbRight);

            RemoveSelectedItem(lbLeft);

            lblMsg.Text
=""//注意:为什么要这一行?
            
            
foreach(ListItem item in lbRight.Items)
            
{
               
if(item.Selected)
                  lblMsg.Text 
+=item.Text;
            }

         }

      }


      
protected void btnToLeft_Click(object sender, EventArgs e)
      
{
         
if(lbRight.SelectedItem != null)
         
{            
            AddItemFromSourceListBox(lbRight, lbLeft);
            RemoveSelectedItem(lbRight);
         }

      }


      
private void RemoveSelectedItem(ListBox listControl)
      
{         
         
while(listControl.SelectedIndex != -1)
         
{
            listControl.Items.RemoveAt(listControl.SelectedIndex);
         }
         
      }


      
private void AddItemFromSourceListBox(ListBox sourceBox,ListBox targetBox)
      
{
         
foreach(ListItem item in sourceBox.Items)
         
{
            
if(item.Selected == true && !targetBox.Items.Contains(item))
            
{
               targetBox.Items.Add(item);
            }

         }

      }


}
 

posted @ 2007-12-01 09:04  Be Myself  阅读(608)  评论(0编辑  收藏  举报