访问另一个数据绑定控件内的数据列表事件在嵌套数据列表中查找控件

Question

我在另一个 DataList 中有一个 DataList。我想访问子 DataList“dlQuestion”事件、ItemDataBound 事件。另外，我试图在子数据列表中找到控件 LableControl“lblQuestion”。我该怎么做？这是标记：

<asp:DataList ID="dlSection" runat="server" Width="100%">
   <ItemTemplate>
       <div>
         <asp:Label ID="lblSection" runat="server" Text='<%# Eval("Section") %>'></asp:Label>
         <asp:HiddenField ID="hfSectionId" runat="server" Value='<%# Eval("SectionId") %>' />
        </div>
        <asp:DataList ID="dlQuestion" runat="server"  >
        <ItemTemplate>
           <asp:Label ID="lblQuestion" runat="server" Text='<%# Eval("Question") %>'></asp:Label></td>
           <asp:HiddenField ID="hfQuestionId" runat="server" Value='<%# Eval("QuestionId") %>' />
        </ItemTemplate>
       </asp:DataList>
    </ItemTemplate>
</asp:DataList>

Answer 1

您需要处理 dlQuestion DataList 的 ItemDataBound 事件并在该事件处理程序中获取 lblQuestion Label：

标记：

<asp:DataList ID="dlSection" runat="server" Width="100%">
     <ItemTemplate>
          <div>
               <asp:Label ID="lblSection" runat="server" Text='<%# Eval("Section") %>'></asp:Label>
               <asp:HiddenField ID="hfSectionId" runat="server" Value='<%# Eval("SectionId") %>' />
          </div>
          <asp:DataList ID="dlQuestion" runat="server" OnItemDataBound="dlQuestion_ItemDataBound">
               <ItemTemplate>
                    <asp:Label ID="lblQuestion" runat="server" Text='<%# Eval("Question") %>'></asp:Label></td>
                    <asp:HiddenField ID="hfQuestionId" runat="server" Value='<%# Eval("QuestionId") %>' />
               </ItemTemplate>
          </asp:DataList>
     </ItemTemplate>
</asp:DataList>

代码隐藏：

protected void dlQuestion_ItemDataBound(object sender, DataListItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        var lblQuestion = e.Item.FindControl("lblQuestion") as Label;
        if (lblQuestion != null)
        {
            lblQuestion.ForeColor = Color.Red;
        }
    }
}

Answer 2

这是在子数据列表中查找标签控件的一种方法...

 //here I am finding item(DataList) of child Datalist

 DataList dlSubChild = (DataList)childItem.FindControl("dlSubChild");
 foreach (DataListItem subChildItem in dlSubChild.Items)
 {

       //here I am finding item(TextBox) of sub child Datalist
       TextBox txtName = (TextBox)subChildItem.FindControl("txtName");



      //set literal(litName) text

     litName.Text = string.Format("{0}{1}", "Welcome ", txtName.Text);

}

我希望它能帮助您...