ReportParameters in bindings

[Joel]

Is is possible to access ReportParameters in bindings?  I am trying to avoid adding a column to my dataset with a single value, but am having some difficulties.

I have a function
    Public Shared Function GetStarValue(ByVal _Metric As Double, ByVal _ValType As Int32) As String
        If _ValType = -1 Then 
            Return "*"
        Else
            Return CStr(FormatNumber(_Metric, 1))
        End If
    End Function

Called via a binding for a textbox works fine:
=GetStarValue(cdbl(Fields.MyScore), -1)

this does not
=GetStarValue(cdbl(Fields.MyScore), cint(ReportParameters(1).Value))

debug Textbox on the page populated with the following correctly shows -1 so the value is available:
 TextBox5.Value = ReportParameters(1).Value

Error is:
An error has occurred while processing TextBox 'TextBox1':
The expression contains undefined function call ReportParameters().

Is it possible to access parameters in this way, if not, any alternatives other than adding 1000 rows of "-1" to my dataset?

Thanks.

[Steve]

Hi Joel,

As duly noted in our documentation (see Using Report Parameters in Expressions), report parameters are referenced with the keyword =Parameters e.g. =Parameters.VendorSelect.Value.
Indexing is not supported in expressions but would work if you use parameters programmatically.

Generally whenever you need a predefined column with either constant value or some expression, use Calculated Fields.

Regards,
Steve
the Telerik team