ListBox--列表框

SelectionMode	组件中条目的选择类型：单选，多选
Row	此组件显示多少行
Selected	检测条目是否被选中
SelectedItem	返回类型是ListItem,获得组件中被选择的条目
Count	组件中条目的总数
SelectIndex	组件中被选择条目的索引值
Items	泛指组件中所有的条目，每个条目的类型都是ListItem

1、动态添加列表框

  protected   void  TextBox1_TextChanged( object  sender, EventArgs e)
     {
        ListBox2.Items.Add(TextBox1.Text);
        Button1.Text = "移除";
        Button1.Enabled = true;
        Button2.Text = "清空";
        Button2.Enabled = true;
    }
     protected   void  Button2_Click( object  sender, EventArgs e)
     {
        if (ListBox2.Items.Count > 0)
        {
            
            ListBox2.Items.Clear();
            Button2.Enabled = false;
        }
   
    }
     protected   void  Button1_Click( object  sender, EventArgs e)
     {
        if (ListBox2.Items.Count > 0)
        {
            ListBox2.Items.Remove(ListBox2.SelectedItem);  //移除选定项
        }
        else
        {
            Button1.Enabled = false;
        }
    }

2、ListBox两级联动

  protected   void  ListBox3_SelectedIndexChanged( object  sender, EventArgs e)
     {
        switch (ListBox3.SelectedValue)
        { 
            case "fz":
                ListBox4.Items.Clear();
                ListBox4.Items.Add("鼓山");
                ListBox4.Items.Add("西湖");
                ListBox4.Items.Insert(1,"旗山");
                break;
            case "sh":
                ListBox4.Items.Clear();
                ListBox4.Items.Add("东方明珠");
                ListBox4.Items.Add("浦东");
                break;
            case "hk":
                ListBox4.Items.Clear();
                ListBox4.Items.Add("维多利亚港");
                
                break;
            case "bj":
                ListBox4.Items.Clear();
                ListBox4.Items.Add("故宫");
                ListBox4.Items.Add("长城");
                break;
        }

3、列表指定项位移与光标移动

protected   void  Button3_Click( object  sender, EventArgs e)
     {
        if (((Button)sender).CommandName == "up" && ListBox5.SelectedIndex > 0 || ((Button)sender).CommandName == "down" && ListBox5.SelectedIndex < ListBox5.Items.Count - 1)
        {
            int index;
            if (((Button)sender).CommandName == "up")
            {
                index = -1;
            }
            else
            {
                index = 1;
            }
            ListItem lt = new ListItem(ListBox5.SelectedItem.Text,ListBox5.SelectedItem.Value);
            ListBox5.Items[ListBox5.SelectedIndex].Text = ListBox5.Items[ListBox5.SelectedIndex + index].Text;
            ListBox5.Items[ListBox5.SelectedIndex].Value = ListBox5.Items[ListBox5.SelectedIndex + index].Value;
            ListBox5.Items[ListBox5.SelectedIndex + index].Text = lt.Text;
            ListBox5.Items[ListBox5.SelectedIndex + index].Value = lt.Value;
            ListBox5.SelectedIndex = ListBox5.SelectedIndex + index;
        }

    }
     protected   void  Button5_Click( object  sender, EventArgs e)
     {
        ListBox5.SelectedIndex = 0;
    }
     protected   void  Button6_Click( object  sender, EventArgs e)
     {
        ListBox5.SelectedIndex -= 1;

    }
     protected   void  Button7_Click( object  sender, EventArgs e)
     {
        ListBox5.SelectedIndex += 1;
    }
     protected   void  Button8_Click( object  sender, EventArgs e)
     {
        ListBox5.SelectedIndex = ListBox5.Items.Count - 1;
    }