c# – 不能在datalist中为CheckBoxList使用RequiredFieldValidator

我在Datalist中使用CheckBoxList的requiredField Validator时遇到问题.我正在使用复选框列表进行投票选项.我希望用户回答所需的民意调查问题.如果用户没有回答,我想显示错误消息.有人可以帮我这样做吗？

这是我的设计：

<div id="divPollDataList">
     <asp:DataList ID="PollDataList" runat="server" 
        onitemdatabound="PollDataList_ItemDataBound">
              <ItemTemplate>
                 <asp:HiddenField ID="PollIDReqHiddenField" Value='<%# Eval("PollID") %>' runat="server" Visible="false" />
                 <asp:Label ID="lblReqQuestionNumber" runat="server" Text='<%# Eval("No of PollQuestion") %>' Font-Bold="true"></asp:Label>
                <asp:Label ID="lblrequiredPollQusetion" runat="server" Text='<%# Eval("PollQuestions") %>' Font-Bold="true"></asp:Label>
                <asp:HiddenField ID="HiddenFieldPollOption" runat="server" Value='<%# Eval("PollOptions") %>' Visible="false" />
                <asp:HiddenField ID="HiddenFieldPollType" runat="server" Value='<%# Eval("PollType") %>' Visible="false"/>
               <asp:requiredFieldValidator ID="requiredFieldValidatorReqPoll" runat="server"  CausesValidation="true" ControlTovalidate="CheckBoxListMultiple"  display="Dynamic" ErrorMessage="You must provide the Feedback" ></asp:requiredFieldValidator>
                  <asp:CheckBoxList ID="CheckBoxListMultiple" runat="server" ></asp:CheckBoxList>
              </ItemTemplate>
</asp:DataList>

</div>
    <div>
       <asp:Button ID="btnSubmitPoll" runat="server" CausesValidation="true" Text="Submit"  OnClick="btnSubmitPoll_click"  />   

    </div>

<div>
    <asp:Button ID="btnBindData" runat="server" Text="Bind" 
        onclick="btnBindData_Click" />
</div>

这是我的代码：

protected void PollDataList_ItemDataBound(object sender,DataListItemEventArgs e)
    {
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
        {
            System.Data.DaTarowView drv = (System.Data.DaTarowView)(e.Item.DataItem);

            string strPollID = drv.Row["PollID"].ToString();
            string pollOptions = drv.Row["PollOptions"].ToString();
            string strPollType = drv.Row["PollType"].ToString();
            string strPollrequiredorNot = drv.Row["requiredPoll"].ToString();

                CheckBoxList chkList = (CheckBoxList)e.Item.FindControl("CheckBoxListMultiple");
                foreach (string opt in pollOptions.Split('}'))
                {
                    chkList.Items.Add(opt.ToString());
                }
                var validator = (requiredFieldValidator)e.Item.FindControl("requiredFieldValidatorReqPoll");
                validator.Enabled = true;
        }
    }

解决方法

你可以阅读这篇文章,它非常关注Validator和CheckBoxList.

您可以开发自定义验证器

public class requiredFieldValidatorForCheckBoxList : BaseValidator
{
   //..code..
}

可以验证RadioButtonList,但不验证CheckBoxList

链接：http://www.codeproject.com/Articles/28560/CheckBoxList-Validation-in-ASP-Net-Required-Field