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我正在关注管理浏览器历史记录 asp.net 示例文章，但在单击浏览器后退按钮后更新LabelHistoryData标签时遇到问题。我在

LabelHistoryData.Text = Server.HtmlEncode(e.State["s"]);

但不知何故，单击 btnGetInboxList 或 btnGetSentboxList 后跟浏览器后退按钮，LabelHistoryData.Text 值始终为空。下面是我的一部分代码。有人请善意建议。

谢谢。

     <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="True" OnNavigate="OnNavigateHistory" EnableHistory="true" EnableSecureHistoryState="false" />  

      <asp:UpdatePanel ID="uiupInboxMainGrid" runat="server" UpdateMode="Conditional">
                        <ContentTemplate>
                            <asp:Label runat="server" ID="LabelHistoryData" />
                            <asp:Button ID="btnGetMessageContent" runat="server" Text="MsgContent" OnClick="GetMessageContent_Click" />
                            <asp:Button ID="btnGetInboxList" runat="server" Text="Inbox" OnClick="GetInboxList_Click"/>
                            <asp:Button ID="btnGetSentboxList" runat="server" Text="OutBox" OnClick="GetSentBoxList_Click" />
                        </ContentTemplate>
                    </asp:UpdatePanel>


        public void OnNavigateHistory(object sender, HistoryEventArgs e)
            {
                LabelHistoryData.Text = Server.HtmlEncode(e.State["s"]);
            }

        protected void GetInboxList_Click(object sender, EventArgs e)
            {
                LabelHistoryData.Text = ((Button)sender).Text;
                ScriptManager.GetCurrent(this).AddHistoryPoint("s", LabelHistoryData.Text, "Entry: " + LabelHistoryData.Text);
            }

        protected void GetSentBoxList_Click(object sender, EventArgs e)
            {
                LabelHistoryData.Text = ((Button)sender).Text;
                ScriptManager.GetCurrent(this).AddHistoryPoint("s", LabelHistoryData.Text, "Entry: " + LabelHistoryData.Text);
            }

        protected void GetMessageContent_Click(object sender, EventArgs e)
            {
                LabelHistoryData.Text = ((Button)sender).Text;
                ScriptManager.GetCurrent(this).AddHistoryPoint("s", LabelHistoryData.Text, "Entry: " + LabelHistoryData.Text);
            }
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1 回答 1

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事实证明，UpPanel UpdateMode 必须设置为 Always。

于 2013-01-22T08:25:25.687 回答