Asp.net中继器查找控件

Question

转发器中的HTML输入我试图获取复选框的值但找不到

    foreach (RepeaterItem ri in RpSorular.Items)
    {
        HtmlInputCheckBox DegerA = (HtmlInputCheckBox)ri.FindControl("DegerA");

        if (DegerA.Checked)
        {
            Response.Write(DegerA.Value);
        }
    }