自动绑定列表控件的数据

来源：互联网发布：人员管理系统 php 编辑：程序博客网时间：2024/05/23 18:32

<asp:ScriptManager ID="smForm" runat="server">
        </asp:ScriptManager>
        <asp:UpdatePanel ID="upForm" runat="server">
        <ContentTemplate>
            <asp:DropDownList ID="ddlFilter" runat="server" AutoPostBack="True"
                onselectedindexchanged="ddlFilter_SelectedIndexChanged" Width="150px">
                <asp:ListItem Value="1">A-G</asp:ListItem>
                <asp:ListItem Value="2">H-K</asp:ListItem>
                <asp:ListItem Value="3">L-N</asp:ListItem>
                <asp:ListItem Value="4">O-Q</asp:ListItem>
                <asp:ListItem Value="5">R-T</asp:ListItem>
                <asp:ListItem >U-Z</asp:ListItem>
            </asp:DropDownList>
            <asp:ListBox ID="lbLetter" Rows="10" Width="150px" runat="server"></asp:ListBox>
        </ContentTemplate>
        </asp:UpdatePanel>

protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
            BindListData('A','G');
    }

    private void BindListData(char lower, char upper)
    {
        if (lower < 'A' || upper > 'Z')
        { return; }
        lbLetter.Items.Clear();
        for (int i = 0; i < (int)(upper - lower) + 1; i++)
        {
            char ch = (char)(lower+i);
            lbLetter.Items.Add(new ListItem(ch.ToString(),ch.ToString()));
        }
    }

    protected void ddlFilter_SelectedIndexChanged(object sender, EventArgs e)
    {
        char lower = char.Parse(ddlFilter.SelectedItem.Text.Substring(0,1));
        char upper = char.Parse(ddlFilter.SelectedItem.Text.Substring(2,1));
        BindListData(lower,upper);
    }