case 中的部分内容看不懂，请各位大虾指点指点~~

前台代码<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>無題のページ</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h1>
        BulletedList Control
    </h1>
        <asp:BulletedList ID="bltList" runat="server" Target="_blank" OnClick="bltList_Click">
            <asp:ListItem Value="http://www.163.com/">
                网易
            </asp:ListItem>
            <asp:ListItem Value="http://vc.hanghai.com/index.asp">
                航海世紀
            </asp:ListItem>
            <asp:ListItem Value="http://www.baidu.com/" Text="百度">
               
            </asp:ListItem>
        </asp:BulletedList>
        <table>
            <tr>
                <td colspan="3" id="tdMessage" runat="server">
                </td>               
            </tr>
            <tr>
                <td>
                    BulletedStyle
                </td>
                <td>
                    FristBulletNumber
                </td>
                <td>
                    DisplayMode
                </td>
            </tr>
            <tr>
                <td>
                    <asp:ListBox ID="lbBulletStyle" runat="server" AutoPostBack="True" OnSelectedIndexChanged="lb_SelectedIndexChanged">
                        <asp:ListItem>NotSet
                        </asp:ListItem>
                        <asp:ListItem>Numberd
                        </asp:ListItem>
                        <asp:ListItem>LowerAlpha
                        </asp:ListItem>
                        <asp:ListItem>UpperAlpha
                        </asp:ListItem>
                        <asp:ListItem>LowerRoman
                        </asp:ListItem>
                        <asp:ListItem>UpperRoman
                        </asp:ListItem>
                        <asp:ListItem>Disc
                        </asp:ListItem>
                        <asp:ListItem>Cricle
                        </asp:ListItem>
                        <asp:ListItem>Square
                        </asp:ListItem>
                        <asp:ListItem>CustomImage
                        </asp:ListItem>
                    </asp:ListBox>
                </td>
                <td >
                    <asp:ListBox ID="lbFristBulletNumber" runat="server" AutoPostBack="True" Width="50" OnSelectedIndexChanged="lb_SelectedIndexChanged">
                        <asp:ListItem>1
                        </asp:ListItem>
                        <asp:ListItem>2
                        </asp:ListItem>
                        <asp:ListItem>3
                        </asp:ListItem>
                        <asp:ListItem>4
                        </asp:ListItem>
                        <asp:ListItem>5
                        </asp:ListItem>
                        <asp:ListItem>6
                        </asp:ListItem>
                    </asp:ListBox>
                </td>
                <td>
                    <asp:ListBox ID="lbDisplayMode" runat="server" AutoPostBack="True" OnSelectedIndexChanged="lb_SelectedIndexChanged">
                        <asp:ListItem>NotSet
                        </asp:ListItem>
                        <asp:ListItem>Text
                        </asp:ListItem>
                        <asp:ListItem>HyperLink
                        </asp:ListItem>
                        <asp:ListItem>LinkButton
                        </asp:ListItem>
                    </asp:ListBox>
                </td>
            </tr>
        </table>
    </div>
    </form>
</body>
</html> 后台的代码：protected void lb_SelectedIndexChanged(object sender, EventArgs e)
    {
        ListBox lb = (ListBox)sender;
        string strID = lb.ID;
        string strValue = lb.SelectedValue;
        switch (strID)
        {
            case"lbBulletStyle":
                BulletStyle style = (BulletStyle)Enum.Parse(typeof(BulletStyle), strValue);
                bltList.BulletStyle = style;
                if (style == BulletStyle.CustomImage)
                {
                    bltList.BulletImageUrl = "heart.bmp";
                }
                break;
            case"lbFristBulletNumber":
                bltList.FirstBulletNumber = Convert.ToInt32(strValue);
                break;
            case "lbDisplayMode":
                BulletedListDisplayMode displayMode = (BulletedListDisplayMode)Enum.Parse(typeof(BulletedListDisplayMode), strValue);
                bltList.DisplayMode = displayMode;
                break;
            default:
                break;
        }
    }    protected void bltList_Click(object sender, BulletedListEventArgs e)
    {
        BulletedList b = (BulletedList)sender;
        tdMessage.InnerHtml = "selected index:" + e.Index.ToString() + "selected value:" + b.Items[e.Index].Value + "<br>";
    }这些case 中的部分看不懂，请各位大虾指点指点~~

解决方案 »

  1.   

    多个listbox控件用了同一个委托，OnSelectedIndexChanged="lb_SelectedIndexChanged"在lb_SelectedIndexChanged事件中，通过strID来判断是哪一个listbox触发了这一事件，每个case对应一个listbox，执行相应的代码
      

  2.   

    就是根据不同的ListBox 做不同的事情
    哪句话不懂
    请指点指点～～～
      

  3.   

    switch (strID)
            {
                case"lbBulletStyle":
    这就一根据strID的不同值选择case啊~有什么不懂的?具体点说嘛
      

  4.   

    用一个事件处理程序lb_SelectedIndexChanged处理不同的对象((ListBox)sender)引发的事件
      

  5.   

    不懂之一：BulletStyle style = (BulletStyle)Enum.Parse(typeof(BulletStyle), strValue);
    bltList.BulletStyle = style;
    不懂之二：
    bltList.FirstBulletNumber = Convert.ToInt32(strValue);
    不懂之三：
    BulletedListDisplayMode displayMode = (BulletedListDisplayMode)Enum.Parse(typeof(BulletedListDisplayMode), strValue);
    bltList.DisplayMode = displayMode;
      

  6.   

    不懂之一：BulletStyle style = (BulletStyle)Enum.Parse(typeof(BulletStyle), strValue);
    bltList.BulletStyle = style;
    不懂之二：
    bltList.FirstBulletNumber = Convert.ToInt32(strValue);
    不懂之三：
    BulletedListDisplayMode displayMode = (BulletedListDisplayMode)Enum.Parse(typeof(BulletedListDisplayMode), strValue);
    bltList.DisplayMode = displayMode;
    --------------------------------------------------------------------这些不都是类型转换吗?有什么不懂的?