将参数传递给子报表到水晶报表，WINDOWS APPLICATION [英] passing parameter to a sub report into a crystal report, WINDOWS APPLICATION

问题描述

我需要将参数传递到水晶报表中的子报表中。注意它是一个windosw appliacation ..到目前为止我的代码看起来像（但是当我启动应用程序时它仍然需要用户的参数。

I need to pas parameters into a subreport in crystal report. ATTENTION its a windosw appliacation.. My code so far looks like ( BUT when i start the application it still requires the paramters from the user.

Dim r As New rptMain '--this is the crystal report (main)
          r.SetDataSource(dsMain.Tables(0))


          Dim rr As New rptSub '-- this is the subreport 
          r.Subreports(0).SetDataSource(dsDetal)

          CrystalReportViewer1.ReportSource = r

推荐答案

Dim r As New rptMain '--this is the crystal report (main)
          r.SetDataSource(dsMain.Tables(0))


          Dim rr As New rptSub '-- this is the subreport
          r.Subreports(0).SetDataSource(dsDetal.Tables(0))

          CrystalReportViewer1.ReportSource = r

当向子报告添加.Tables（0）时，它可以...... - - >这行r.Subreports（0）.SetDataSource（dsDetal.Tables（0））

之前它是

r.Subreports（0）.SetDataSource（dsDetal）

When a add .Tables(0) to the subreport it is ok... ---> This line r.Subreports(0).SetDataSource(dsDetal.Tables(0))
previously it was
r.Subreports(0).SetDataSource(dsDetal)

这是正确的，所以你没有将任何参数传递给子报告。

Rightfully so you did not pass any parameter to the subreport.

Dim r As New rptMain '--this is the crystal report (main)
          r.SetDataSource(dsMain.Tables(0))


          Dim rr As New rptSub '-- this is the subreport
          r.Subreports(0).SetDataSource(dsDetal)
         
' Assuming your parameter is named p1 and you want to pass the value "hello" to it
' the parameter is named helloparameter
         Dim PFlds As New ParameterFields() 
         Dim PFld As New ParameterField("helloparameter") ' changed here
         Dim PVal As New ParameterDiscreteValue()
         PVal.Value = "hello"
         PFld.CurrentValues.Add(PVal) 
         PFlds.Add(PFld)
         CrystalReportViewer1.ReportSource = r
         CrystalReportViewer1.ParameterFieldsInfo = PFlds

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