Question

I have 20 radiobuttonlists on a page. Each has 4 options with values 1, 2, 3 and 4.

What I need to do is on submitting the form, get the total value of all the radiobuttonlists (eg 3+1+2+3+4…) divided by the total number that have actually been filled in (none of them are required fields so anything from 0 to 20 of them could have been filled in) – hence getting an average value.

Is there an easy / elegant way of doing this?

Answer 1

I would embed the RadioButtonLists in a Panel or an other Container-control. Then you can loop its control-collection to get all RadioButtonLists.

Do you want to divide by the number of RBL’s or by the number of selected RBL’s?

Example that divides by RBL-Count,hence counts non selected as zero, and rounds to next integer:

aspx:

   <asp:Panel ID="OptionPanel" runat="server">
        <asp:RadioButtonList ID="RadioButtonList1" runat="server" RepeatDirection="Horizontal">
            <asp:ListItem Text="1" Value="1"></asp:ListItem>
            <asp:ListItem Text="2" Value="2"></asp:ListItem>
            <asp:ListItem Text="3" Value="3"></asp:ListItem>
            <asp:ListItem Text="4" Value="4"></asp:ListItem>
        </asp:RadioButtonList>
        <!-- and so on ... -->
    </asp:Panel>
    <asp:Button ID="BtnCalculate" runat="server" Text="calculate average value" />
    <asp:Label ID="LblResult" runat="server" Text=""></asp:Label>

and in codebehind:

    Protected Sub BtnCalculate_Click(ByVal sender As Object, ByVal e As EventArgs) Handles BtnCalculate.Click
        Dim rblCount As Int32
        Dim total As Int32
        Dim avg As Int32
        For Each ctrl As UI.Control In Me.OptionPanel.Controls
            If TypeOf ctrl Is RadioButtonList Then
                rblCount += 1
                Dim rbl As RadioButtonList = DirectCast(ctrl, RadioButtonList)
                If rbl.SelectedIndex <> -1 Then
                    Dim value As Int32 = Int32.Parse(rbl.SelectedValue)
                    total += value
                End If
            End If
        Next
        If rblCount <> 0 Then
            avg = Convert.ToInt32(Math.Round(total / rblCount, MidpointRounding.AwayFromZero))
        End If
        Me.LblResult.Text = "Average: " & avg
    End Sub

According to youre new informations that you need to count only the selected RadioButtonLists and ignore f.e. RadioButtonList14 completely, have a look:

If rbl.SelectedIndex <> -1 AndAlso rbl.ID <> "RadioButtonList14" Then
   Dim value As Int32 = Int32.Parse(rbl.SelectedValue)
   total += value
   rblCount += 1 'count only the selected RadiobuttonLists'
End If

I have moved rblCount += 1 into the If rbl.SelectedIndex <> -1-Statement, besides i’ve added rbl.ID <> "RadioButtonList14" as additional restriction to ignore this RadioButtonList.