C# asp.net中的页面索引交换

我对PageIndexchange方法有一个问题。 我的代码没有进入PageIndexChange方法。 我已经添加了updatePanel，但它仍然不能工作。 你知道吗

我的代码是

        <asp:UpdatePanel ID="updatePanel" runat="server">

        <ContentTemplate>

        <asp:GridView ID="grdEmp" runat="server" AllowSorting="True" EmptyDataText="No records found"
            CssClass="table table-striped table-bordered" RowStyle-CssClass="rowHover" ShowHeader="true" OnRowCommand="grdEmp_RowCommand"
            AutoGenerateColumns="False"
            AllowPaging="True"
             OnPageIndexChanging="grdEmp_PageIndexChanging"
            PageSize="20"

            CellPadding="2" ForeColor="#333333"
            GridLines="None" Width="100%">
            <AlternatingRowStyle BackColor="White" ForeColor="#284775" />

            <Columns>
                <asp:BoundField HeaderText="Movie" DataField="name" ItemStyle-HorizontalAlign="Center" ItemStyle-VerticalAlign="Middle" />
                <asp:BoundField HeaderText="Director" DataField="director" ItemStyle-HorizontalAlign="Center" ItemStyle-VerticalAlign="Middle" />
                <asp:BoundField HeaderText="Genre" DataField="genre" ItemStyle-HorizontalAlign="Center" ItemStyle-VerticalAlign="Middle" />
                <asp:BoundField HeaderText="Year" DataField="year" ItemStyle-HorizontalAlign="Center" ItemStyle-VerticalAlign="Middle" />
                <asp:ButtonField HeaderText="" ItemStyle-HorizontalAlign="Center" ItemStyle-VerticalAlign="Middle" ButtonType="Button" ControlStyle-CssClass="btn btn-default" Text="Like" CommandName="like" />
            </Columns>
            <EditRowStyle BackColor="#999999" />
            <FooterStyle BackColor="#ffffff" Font-Bold="True" ForeColor="Red" />
            <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
            <RowStyle CssClass="rowHover" BackColor="#F7F6F3" ForeColor="#333333"></RowStyle>
            <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
            <SortedAscendingCellStyle BackColor="#E9E7E2" />
            <SortedAscendingHeaderStyle BackColor="#506C8C" />
            <SortedDescendingCellStyle BackColor="#FFFDF8" />
            <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
            <EmptyDataRowStyle Width="550px" ForeColor="Red" Font-Bold="true"
                HorizontalAlign="Center" />
        </asp:GridView>

           </ContentTemplate>
            </asp:UpdatePanel> 

---

您可以在Update面板上将UpdateMode指定为Conditional，然后使用PostBackTrigger或AsyncPostBackTrigger指定触发器部分

<asp:UpdatePanel ID="upnlReg" runat="server" UpdateMode="Conditional">
                <ContentTemplate>

   </ContentTemplate>
                <Triggers>
                    <asp:PostBackTrigger ControlID="grdEmp" />

                </Triggers>
                </asp:UpdatePanel>

<asp:UpdatePanel ID="upnlReg" runat="server" UpdateMode="Conditional">
                <ContentTemplate>

   </ContentTemplate>
                <Triggers>
                    <asp:PostBackTrigger ControlID="grdEmp" />

                </Triggers>
                </asp:UpdatePanel>