updatePanel中treeview中节点过多，定位滚动条的问题

自己网上找了半天，试了很多方法，都不可以，索信重新把UpdatePanel控件给认识了一边，这才发现，网上的回答都不全，现在我整理了一份。希望对以后碰到类似问题的童鞋有帮助。

这是第一个UpdatePanel

<asp:UpdatePanel ID="Uptv" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false">
                                <ContentTemplate>
                                    <asp:Panel ID="Paneltv" runat="server" Height="600px" ScrollBars="Auto" Width="450px">
                                        <asp:TreeView ID="tvfun" runat="server" BorderStyle="None" ExpandDepth="0"
                                            ShowLines="True" Width="400px" ForeColor="Black" ShowCheckBoxes="All" OnSelectedNodeChanged="tvfun_SelectedNodeChanged"  >
                                            <SelectedNodeStyle BackColor="#3399FF" />
                                        </asp:TreeView>
                                    </asp:Panel>
                                </ContentTemplate>
</asp:UpdatePanel>

 

这是第二个UpdatePanel

<asp:UpdatePanel ID="Upgv" runat="server" UpdateMode="Conditional">
                                <ContentTemplate>
                                    <asp:Label ID="LabBtn" runat="server" Text=""></asp:Label>
                                </ContentTemplate>
                                <Triggers>
                                    <asp:AsyncPostBackTrigger ControlID="tvfun" EventName="SelectedNodeChanged" />
                                </Triggers>
                            </asp:UpdatePanel>

 

注意的是网上很多回答都没有ChildrenAsTriggers="false" 这段代码，导致无法定位滚动条！