SSRS reference report variable from report function

Question

In SSRS, is it possible to reference a report variable from a report function?

Below is my report function. Instead of declaring and setting the MaxRFWIDRange in the function, I'd rather reference a report variable with the same name.

Function ValidateRFWIDRange(FromRFW As Integer, ToRFW As Integer) As Boolean

    Dim DiffRFW As Integer
    Dim MaxRFWIDRange As Integer
    MaxRFWIDRange = 10000
    DiffRFW = ToRFW - FromRFW

    If DiffRFW > MaxRFWIDRange Then
        Return False
    Else
        Return True
    End if
End Function

Answer 1

It looks like you can do this.

I tested this by adding a variable TestVariable to a report, then adding the following custom code:

Function TestVariableFunctionality(var as Microsoft.ReportingServices.ReportProcessing.OnDemandReportObjectModel.Variable) As String
    Return var.Value
End Function

I called the function from a textbox like so:

=Code.TestVariableFunctionality(Variables!TestVariable)

This outputs the variable's value in the textbox as a string.

You must declare the full namespace as Microsoft.ReportingServices.ReportProcessing.OnDemandReportObjectModel.Variable, because Variable alone is not defined. See below for more info.

Accessing variable in SSRS function

From an MSDN blog:

Assume that you've created a report variable named "Reportvariable1".

All you need is a piece of custom code.

Public Function SetVariableValue(val as Microsoft.ReportingServices.ReportProcessing.OnDemandReportObjectModel.Variable)

val.Value = val.Value + 2

End Function

As simple as that. All i'm doing in the function is, take the report variable reference, add 2 to the existing value. That's it.

How you can call this function from your report item?

=Code.SetVariableValue(Variables!Reportvariable1)

This will do the magic. Also note that in the above expression i'm just passing the variable reference and not its value.