C# 水晶报表中缺少参数值

Question

我正在尝试将参数从 Winform 传递到 Crystal Report，但出现此错误

缺少参数值

我的代码：

PrintCashReport cashreport = new PrintCashReport();
rptvwrcash.ReportSource = cashreport;

ParameterFields paramfields = new ParameterFields();
ParameterField type = new ParameterField();
type.Name = "type";

ParameterDiscreteValue dvtype = new ParameterDiscreteValue();
dvtype.Value = DailySalesReportBL.typeofrpt;
type.CurrentValues.Add(dvtype);
paramfields.Add(type);

rptvwrcash.ParameterFieldInfo = paramfields;

//PrintCashReport cashreport = new PrintCashReport();
cashreport.SetDataSource(ds);
cashreport.SetParameterValue("type", DailySalesReportBL.typeofrpt);

//rptvwrcash.ReportSource = cashreport;
System.Drawing.Printing.PrintDocument printDocument = new System.Drawing.Printing.PrintDocument();
cashreport.PrintOptions.PrinterName = printDocument.PrinterSettings.PrinterName;
cashreport.PrintOptions.PrinterName = "EPSON TM-T88V Receipt";
cashreport.PrintToPrinter(1, false, 0, 0);

我在 Crystal Report 中检查了参数的名称，这也很好。我检查了值，它也得到了正确的值。

所以请帮我找出我哪里弄错了。

谢谢

Answer 1

你应该在“cashreport.SetDataSource(ds)”之后设置“paramfields.Add(....”！！

否则，参数被“SetDataSource....”覆盖

Answer 2

报告参数如下所示：

CRPT.SetParameterValue("smonth", Servercls.month);
CRPT.SetParameterValue("sday", Servercls.day);
CRPT.SetParameterValue("datevalue", Servercls.Datevalue);
Report_Viewer.ReportSource = CRPT;

请参阅此Report Parameter 了解更多信息。

试试这个方法：

ReportDocument  CRPT = new ReportDocument();
ParameterFields param = new ParameterFields();
ParameterDiscreteValue paramdesc = new ParameterDiscreteValue();
ParameterField paramfield = new ParameterField();
paramfield.Name = "type";

String APPPATH = Environment.CurrentDirectory + "\\CrystalReport1.rpt";
CRPT.Load(APPPATH);
param = CRPT.ParameterFields;
CRPT.ParameterFields.Add(paramfield);
param["type"].CurrentValues.Clear();
paramdecs.Value = "this is you crystal report parameter value value";
param["type"].CurrentValues.Add(paramdecs);

rv.ReportSource = CRPT;