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