VS2008 CR报表查看器。打印并导出到PDF不起作用

您是否正在维护报表文档本身的状态?我必须将报告添加到会话中,并在页面加载时重置报告源。

    ReportDocument report = new ReportDocument();
        report.Load(Server.MapPath("blargh.rpt"));
        //...
        rptViewer.ReportSource = report;

session[constants.session.report]=报告;

protected void Page_Load(object sender, EventArgs e)
    {//detects wether or not the RepoerViewer should be displayed again, to avoid it displaying an empty modal box.
        if (hdfDisplayCrystalReport.Value == "Yes")
        {

            rptViewer.ReportSource = (ReportDocument)Session[Constants.Session.Report];

        }


        if (rptViewer.ReportSource == null)
        {
            hdfDisplayCrystalReport.Value = string.Empty;

        }

}

您是在UpdatePanel中使用报告吗?如果是,请检查是否已将触发器置于面板内:

<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>

同时检查你是否有 ViewState 为页面启用