FastReport 导出pdf 默认显示一条的解决

FastReport.Report report = new FastReport.Report();
report.Load(reportPath);
report.RegisterData(ds);//刷新数据源
report.GetDataSource("Orders").Enabled = true;
DataBand data = report.Report.FindObject("Data1") as DataBand;
data.DataSource = report.Report.GetDataSource("Orders");
report.Prepare();

FastReport.Export.PdfSimple.PDFSimpleExport expPdf = new FastReport.Export.PdfSimple.PDFSimpleExport();
report.Export(expPdf, Path.Combine(RelativePath, saveName));
report.Dispose();