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Parameters in Crystal Reports 9 through VS.Net 2003

Posted on 2004-03-25
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Last Modified: 2012-05-04
I am trying to set parameters correctly in an ASP.Net page for a crystal report but keep getting the message: Missing parameter field current value. Here is my current code:

CRV1.ReportSource = myReport
Dim ParameterFields As ParameterFields
ParameterFields = CRV1.ParameterFieldInfo
If Session.Item("Parm") <> "" Then
    Dim strParmName As String, strParmVal As String
    strParmName = Session.Item("ParmName")
    strParmVal = Session.Item("Parm")
    myReport.SetParameterValue(0, strParmVal)
Else
    Dim ParameterField As ParameterField
    ParameterField = ParameterFields.Item(0)
    If myReport.DataDefinition.ParameterFields(0).DefaultValues.Count > 0 Then
        ParameterField.CurrentValues = ParameterField.DefaultValues
    Else
        ParameterField.EnableNullValue = True
    End If
End If

Neither the Default nor the EnableNullValue seem to work.  What am I doing wrong - I can't seem to find any documentation on this for crystal 9.
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Question by:pmcgivern
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2 Comments
 
LVL 4

Accepted Solution

by:
stasau earned 250 total points
ID: 10677197
You still need to set the Parameter Value to NULL after you enable it to be null.  So the end of your if statement should look like:

    Else
        ParameterField.EnableNullValue = True
       myreport.SetParameterValue(0, vbNullString)
    End If

You could also create a ParameterValues object and set its value to null and add that to the ParameterField.CurrentValues collection but this is easier.
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LVL 2

Author Comment

by:pmcgivern
ID: 10677392
Excellent - that works now for the nulls.  
Fixed the defaults problem too :
ParameterField.CurrentValues = ParameterField.DefaultValues

should be:

myReport.SetParameterValue(0, ParameterField.DefaultValues.Item(0))

Thanks.
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