UpdatePanel 中 ListView 中的 LinkBut​​ton 导致完全回发

我在 UpdatePanel 的 ListView 中有一个 LinkBut​​ton.我希望按钮(好吧，其中任何一个)导致部分回发，但它们导致整页回发.

I have a LinkButton in a ListView in an UpdatePanel. I would like the button (well, any of them) to cause a partial postback, but they are causing a full page postback.

<asp:UpdatePanel ID="upOutcomes" UpdateMode="Conditional" runat="server">
  <ContentTemplate>
      <asp:ListView ID="lvTargets" runat="server" onitemdatabound="lvTargets_ItemDataBound">
        <ItemTemplate>
          <asp:LinkButton ID="lnkAddTarget" CssClass="lo" Text='<%# Eval("Title") + " <b>" + Eval("Level") + Eval("SubLevel") + "</b>" %>' runat="server"></asp:LinkButton>
        </ItemTemplate>
      </asp:ListView>
  </ContentTemplate>
</asp:UpdatePanel>

我在 stackoverflow 上发现了另一篇文章，建议添加这个:

I found another post on stackoverflow which suggested adding this:

protected void lvTargets_ItemDataBound(object sender, ListViewItemEventArgs e) {
  var lb = e.Item.FindControl("lnkAddTarget") as LinkButton;
  tsm.RegisterAsyncPostBackControl(lb);  // ToolkitScriptManager
}

没有任何区别...

还有一些其他类似的帖子，但我找不到解决方案！有什么想法吗?

There are a few other similar posts too, but I can't find a solution! Any ideas?