找到方法:
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<CR:CrystalReportViewer ID="CrystalReportViewer1" runat="server"
DisplayGroupTree="False" oninit="CrystalReportViewer1_Init" />
</ContentTemplate>
<Triggers> <asp:PostBackTrigger ControlID="CrystalReportViewer1"/></Triggers>
</asp:UpdatePanel>