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  • ListBox控件

    呈现形态

    <select size=”4” name=”lb_cai” multiple=”multiple”id=”lb_cai”>
         <option value=”1”>糖醋排骨</option>
         <option value=”2”>红烧鸡块</option>
         <option value=”3”>清蒸鲍鱼</option>
         <option value=”4”>酸菜鱼</option>
         <option value=”5”>香辣鸡翅</option>
    </select>

    控件语句

    <asp:ListBox ID=”lb_food” runat=”server” selectionMode=”multiple”>
      <asp:ListItem value=”1”>糖醋排骨</asp:ListItem>
      <asp:ListItem value=”2”>红烧鸡块</asp:ListItem>
      <asp:ListItem value=”3”>清蒸鲍鱼</asp:ListItem>
      <asp:ListItem value=”4”>酸菜鱼</asp:ListItem>
    </asp:ListBox>

    ListBox可多选

       可调用属性与DropDownList相同

                          Ibox_selectIndex                只返回一个数值(0,1,2,3)

                          Ibox_selectValue                返回字符串value的值

                          Ibox_selectedItem.text           返回字符串(显示的文本内容)

     

    可多选,就表示我们编程时常需要对控件下的ListItem集合进行遍历操作

     

     

    .NET
    
    <body>
        <form id="form1" runat="server">
        <div>
    <asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple" Height="159px" Width="250px" CssClass="option">
                <asp:ListItem Value="1">糖醋排骨</asp:ListItem>
                <asp:ListItem Value="2">酸菜鱼</asp:ListItem>
                <asp:listitem Value="3">胡辣子兔</asp:listitem>
                 <asp:ListItem Value="4">西瓜</asp:ListItem>
                <asp:listitem Value="5">包子</asp:listitem>
                 <asp:ListItem Value="6">黄瓜炒蛋</asp:ListItem>
                <asp:listitem Value="7">扬州炒饭</asp:listitem>
                 <asp:ListItem Value="8">青岛啤酒</asp:ListItem>
                <asp:listitem Value="9">狗不理包子</asp:listitem>
            </asp:ListBox>
            <asp:Button ID="Button1" runat="server" Text="确定" OnClick="Button1_Click" />
            <asp:TextBox ID="TextBox1" runat="server" TextMode="MultiLine" Height="150px" Width="247px"></asp:TextBox>
        </div>
        </form>
    </body>
    </html> 
    
    
    
    C#
    
    
     protected void Button1_Click(object sender, EventArgs e)
        {
            //第一种方法
            TextBox1.Text="";  //每次选择后textbox1中的记录清空
            //for (int i = 0; i < ListBox1.Items.Count; i++)
            //{
            //    if (ListBox1.Items[i].Selected)
            //    {
            //        TextBox1.Text += ListBox1.Items[i].Text + ",";
            //    }
            //}
    
            //第二种方法
            foreach (ListItem item in ListBox1.Items)
            {
    
                if (item.Selected)
                {
                    TextBox1.Text += item.Text+",";
                }
            }
    
        }

    对Items的删除

    Obj.Items.add(Obj_ListItem);         添加

     

    Obj.Items.Remove(Obj_ListItem);         删除一个特定的ListItem

     

    Obj.Items.Removeat(i);             产出索引号为I的这个项

     

    .NET
    
    <body>
        <form id="form1" runat="server">
        <div>
    <asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple" Height="159px" Width="250px" CssClass="option">
                <asp:ListItem Value="1">糖醋排骨</asp:ListItem>
                <asp:ListItem Value="2">酸菜鱼</asp:ListItem>
                <asp:listitem Value="3">胡辣子兔</asp:listitem>
                 <asp:ListItem Value="4">西瓜</asp:ListItem>
                <asp:listitem Value="5">包子</asp:listitem>
                 <asp:ListItem Value="6">黄瓜炒蛋</asp:ListItem>
                <asp:listitem Value="7">扬州炒饭</asp:listitem>
                 <asp:ListItem Value="8">青岛啤酒</asp:ListItem>
                <asp:listitem Value="9">狗不理包子</asp:listitem>
            </asp:ListBox>
            <asp:Button ID="Button1" runat="server" Text="确定" OnClick="Button1_Click" />
            <asp:TextBox ID="TextBox1" runat="server" TextMode="MultiLine" Height="150px" Width="247px"></asp:TextBox>
        </div>
        </form>
    </body>
    </html> 
    
    
    
    C#
    
    
     protected void Button1_Click(object sender, EventArgs e)
        {
            //第一种方法
            TextBox1.Text="";  //每次选择后textbox1中的记录清空
            //for (int i = 0; i < ListBox1.Items.Count; i++)
            //{
            //    if (ListBox1.Items[i].Selected)
            //    {
            //        TextBox1.Text += ListBox1.Items[i].Text + ",";
            //    }
            //}
    
            //第二种方法
            foreach (ListItem item in ListBox1.Items)
            {
    
                if (item.Selected)
                {
                    TextBox1.Text += item.Text+",";
                }
            }
    
        }
    
    
    
    
    
    
    
    
        protected void Button2_Click(object sender, EventArgs e)
        {
            //反向遍历  用正向遍历的话 两个连续的只能提交一个上去(酸菜鱼、牛肉  只能上去其中一个)
            //不能foreach遍历  因为会破坏集合报错。
            for (int i = ListBox2.Items.Count-1; i >=0; i--)
            {
                if (ListBox2.Items[i].Selected)
                {
                    ListBox3.Items.Add(ListBox2.Items[i]); //listbox3集合中添加listbox2集合删除的
                    ListBox2.Items.RemoveAt(i);  //移除listbox2中已经选择的条目  
                }
            }
        }
        protected void Button3_Click(object sender, EventArgs e)
        {
            for (int i = ListBox3.Items.Count - 1; i >= 0; i--)
            {
                if (ListBox3.Items[i].Selected)
                {
                    ListBox2.Items.Add(ListBox3.Items[i]); 
                    ListBox3.Items.RemoveAt(i);  
                }
            }
        }
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  • 原文地址:https://www.cnblogs.com/xiaowie/p/9150132.html
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