水晶报表-设置选择公式

Question

When I pass a report to a CrystalReportViewer, I can pass a selection formula: 将报表传递给CrystalReportViewer时，可以传递选择公式：

dim viewer as new CrystalReportViewer

viewer.ReportSource = rpt
viewer.SelectionFormula = <some query string>

In some cases, I do not wish to display the report, instead i want to export directly to PDF file: 在某些情况下，我不希望显示报告，而是希望直接导出为PDF文件：

Dim file As Stream = rpt.ExportToStream(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat)

How do you pass the SelectionFormula in this instance? 在这种情况下，如何传递SelectionFormula？

For reference, i get the following error at the moment: 供参考，目前我收到以下错误：

ParameterFieldCurrentValueException was caught 捕获了ParameterFieldCurrentValueException

Missing parameter values. 缺少参数值。

Answer 1

好的，所以我自己回答了这个，解决方法是：

rpt.RecordSelectionFormula = <some query string>