如何在数据列表中访问WebControl

Question

I'm trying to set a value for TextLabel when the the LinkButton MessageName is clicked. However I'm not having any luck.

I tried using DataList.SelectedItem.FindControl("blah") as shown here but SelectedItem keeps returning null .

I also tried something like this stackoverflow question but it's not working as well.

<asp:DataList
   ID="dlMessages"
   runat="server"
   DataSourceID="dsMessages">
<EditItemStyle Font-Names="Courier New" />
<ItemStyle BorderStyle="NotSet" />
<ItemTemplate>
  <div>
    <table>
      <tr>
        <td><asp:LinkButton ID="MessageName" Text="Some stuff" runat="server" /></td>
        <td>...</td>
      </tr>
    </table>
    <asp:Label ID="TextLabel" runat="server />
  </div>
</ItemTemplate>

 protected void DataList_OnItemCommand(object sender, EventArgs e)
 {
     if (dlMessages.SelectedItem == null)
         return;
     DagSelect.Text = ((LinkButton) dlMessages.SelectedItem.FindControl("MessageName")).Text;
     Label l = (Label) dlMessages.SelectedItem.FindControl("TextLabel");
     l.Text = DagSelect.Text;
 }

Does anyone know a good way to do this? Basically, I only want the text to be displayed when the item is selected. When it's not, the string should remain empty/invisible.

Answer 1

将CommandName="Select"添加到LinkBut​​ton，然后将事件更改为DataList上的SelectedIndexChanged事件。

<asp:LinkButton CommandName="Select" ID="MessageName" Text="Some stuff" runat="server" />