DropDownList DataBound事件

当我们在对DropDownList绑定数据的时候

DropDownList1.DataTextField = "";DataTextField 绑定要显示的值
DropDownList1.DataValueField = "";DataValueField 绑定value值

可是当绑定的时候没有value值的话，value的值就会和Text值相等，可是我们value值又不想取文字形式的

这时可以用DropDownList的DataBound事件

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string[] BookingStatus = { "NoUse", "未提交", "已提交", "已取消", "受理中", "已退回", "已订妥", "已过期" };
            DropDownList1.DataSource = BookingStatus;
            DropDownList1.DataBound += new EventHandler(DropDownList1_DataBound);
            DropDownList1.DataBind();
        }
    }

    void DropDownList1_DataBound(object sender, EventArgs e)
    {
        int i = 0;
        //ListControl此类由其他类（如 CheckBoxList、DropDownList、ListBox 和 RadioButtonList 类）继承以提供通用的基本功能
        ListControl list = sender as ListControl;
        foreach (ListItem l in list.Items)
        {
            l.Value = i.ToString();
            i++;
        }
    }